Groups > comp.os.linux.misc > #70357 > unrolled thread

Yes, You Need A Firewall On Linux - Here’s Why And Which To Use

Started by	Lawrence D'Oliveiro <ldo@nz.invalid>
First post	2025-08-05 08:14 +0000
Last post	2025-08-23 05:43 +0000
Articles	20 on this page of 113 — 24 participants

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  Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-08-05 08:14 +0000
    Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Marc Haber <mh+usenetspam1118@zugschl.us> - 2025-08-05 11:22 +0200
      Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Marco Moock <mm@dorfdsl.de> - 2025-08-05 11:34 +0200
    Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use jayjwa <jayjwa@atr2.ath.cx.invalid> - 2025-08-05 11:30 -0400
      Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use The Natural Philosopher <tnp@invalid.invalid> - 2025-08-05 19:56 +0100
        Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-08-06 01:06 +0000
      Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use John McCue <jmclnx@gmail.com.invalid> - 2025-08-06 01:32 +0000
        Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-08-06 04:20 +0000
          Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use c186282 <c186282@nnada.net> - 2025-08-06 01:33 -0400
            Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Mike Scott <usenet.16@scottsonline.org.uk.invalid> - 2025-08-06 09:31 +0100
              Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-08-06 08:56 +0000
                Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Nuno Silva <nunojsilva@invalid.invalid> - 2025-08-06 10:35 +0100
                  Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Mike Scott <usenet.16@scottsonline.org.uk.invalid> - 2025-08-06 11:38 +0100
                    Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-08-07 00:06 +0000
                      Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Mike Scott <usenet.16@scottsonline.org.uk.invalid> - 2025-08-11 11:50 +0100
                        Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-08-11 22:02 +0000
                          Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Mike Scott <usenet.16@scottsonline.org.uk.invalid> - 2025-08-12 08:39 +0100
                            Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Marc Haber <mh+usenetspam1118@zugschl.us> - 2025-08-12 10:49 +0200
                            Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use The Natural Philosopher <tnp@invalid.invalid> - 2025-08-12 10:54 +0100
                              Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2025-08-12 18:47 +0000
                              Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-08-12 23:36 +0000
                            Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use "Carlos E. R." <robin_listas@es.invalid> - 2025-08-12 12:08 +0200
                            Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use rbowman <bowman@montana.com> - 2025-08-12 19:35 +0000
                            Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-08-12 23:07 +0000
                              Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Mike Scott <usenet.16@scottsonline.org.uk.invalid> - 2025-08-13 09:47 +0100
                                Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-08-14 00:41 +0000
                            Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use "Carlos E.R." <robin_listas@es.invalid> - 2025-08-19 12:35 +0200
                              Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Mike Scott <usenet.16@scottsonline.org.uk.invalid> - 2025-08-19 12:18 +0100
                                Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Marc Haber <mh+usenetspam1118@zugschl.us> - 2025-08-19 15:16 +0200
                                  Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-20 01:02 +0000
                                Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Mike Scott <usenet.16@scottsonline.org.uk.invalid> - 2025-08-27 06:56 +0100
                                  Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-28 00:50 +0000
                                    Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Mike Scott <usenet.16@scottsonline.org.uk.invalid> - 2025-08-28 09:40 +0100
                                      Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-29 00:56 +0000
                                        Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use John Ames <commodorejohn@gmail.com> - 2025-08-29 08:10 -0700
                                          Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Mike Scott <usenet.16@scottsonline.org.uk.invalid> - 2025-08-29 19:16 +0100
                                            Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2025-08-30 16:59 +0300
                                              Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Mike Scott <usenet.16@scottsonline.org.uk.invalid> - 2025-08-30 18:45 +0100
                                                Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2025-08-31 21:24 +0300
                                                  Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Mike Scott <usenet.16@scottsonline.org.uk.invalid> - 2025-09-01 17:02 +0100
                                            Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-31 03:25 +0000
                                          Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-30 06:34 +0000
                                            Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Nuno Silva <nunojsilva@invalid.invalid> - 2025-08-30 08:39 +0100
                                              Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use The Natural Philosopher <tnp@invalid.invalid> - 2025-08-30 08:45 +0100
                                              Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Harold Stevens <wookie@trixie.localdomain> - 2025-08-30 05:37 -0500
                                                Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use John Ames <commodorejohn@gmail.com> - 2025-09-02 09:59 -0700
                                                  Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Harold Stevens <wookie@aspen.localdomain> - 2025-09-02 12:59 -0500
                                              Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Richard Kettlewell <invalid@invalid.invalid> - 2025-08-30 17:48 +0100
                              Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-20 01:01 +0000
                                Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use "Carlos E.R." <robin_listas@es.invalid> - 2025-08-20 12:52 +0200
                                  Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-20 22:36 +0000
                                    Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use "Carlos E.R." <robin_listas@es.invalid> - 2025-08-21 11:44 +0200
                                      Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use The Natural Philosopher <tnp@invalid.invalid> - 2025-08-21 11:34 +0100
                                        Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use "Carlos E.R." <robin_listas@es.invalid> - 2025-08-21 14:36 +0200
                                          Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Nuno Silva <nunojsilva@invalid.invalid> - 2025-08-21 14:27 +0100
                                            Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use "Carlos E.R." <robin_listas@es.invalid> - 2025-08-21 21:37 +0200
                                              Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Nuno Silva <nunojsilva@invalid.invalid> - 2025-08-22 10:33 +0100
                                                Manuals [Was: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] "Carlos E.R." <robin_listas@es.invalid> - 2025-08-22 12:39 +0200
                                          Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-22 01:12 +0000
                                      Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-22 01:06 +0000
                                        Documentation [Was: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] "Carlos E.R." <robin_listas@es.invalid> - 2025-08-22 12:26 +0200
                                          Re: Documentation [Was: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-23 23:13 +0000
                                Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use John Ames <commodorejohn@gmail.com> - 2025-08-20 07:47 -0700
                                  Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-20 22:37 +0000
                              Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Stéphane CARPENTIER <sc@fiat-linux.fr> - 2025-08-20 19:25 +0000
                                tldr [WAS: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] "Carlos E.R." <robin_listas@es.invalid> - 2025-08-21 12:04 +0200
                                  Re: tldr [WAS: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] Stéphane CARPENTIER <sc@fiat-linux.fr> - 2025-08-23 12:40 +0000
                                    Re: tldr [WAS: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] "Carlos E.R." <robin_listas@es.invalid> - 2025-08-24 00:40 +0200
                                    Re: tldr [WAS: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-23 23:15 +0000
                                      Re: tldr [WAS: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] Stéphane CARPENTIER <sc@fiat-linux.fr> - 2025-08-24 11:22 +0000
                                        Re: tldr [WAS: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-24 22:18 +0000
                            Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Anssi Saari <anssi.saari@usenet.mail.kapsi.fi> - 2025-08-21 12:40 +0300
                  Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Richard Kettlewell <invalid@invalid.invalid> - 2025-08-06 14:21 +0100
                    Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use The Natural Philosopher <tnp@invalid.invalid> - 2025-08-06 16:24 +0100
              Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use The Natural Philosopher <tnp@invalid.invalid> - 2025-08-06 10:12 +0100
            Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Anssi Saari <anssi.saari@usenet.mail.kapsi.fi> - 2025-08-07 11:43 +0300
          Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use John McCue <jmclnx@gmail.com.invalid> - 2025-08-06 11:55 +0000
        Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Marc Haber <mh+usenetspam1118@zugschl.us> - 2025-08-06 07:40 +0200
          Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-08-06 06:31 +0000
            Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Marc Haber <mh+usenetspam1118@zugschl.us> - 2025-08-06 11:06 +0200
              Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Richard Kettlewell <invalid@invalid.invalid> - 2025-08-06 14:25 +0100
                Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Marc Haber <mh+usenetspam1118@zugschl.us> - 2025-08-06 17:11 +0200
                  Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-08-06 23:59 +0000
                    Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Marc Haber <mh+usenetspam1118@zugschl.us> - 2025-08-07 08:37 +0200
                      Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-08-07 06:52 +0000
                Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Rich <rich@example.invalid> - 2025-08-18 16:49 +0000
        Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use "Carlos E.R." <robin_listas@es.invalid> - 2025-08-06 12:46 +0200
          Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-08-06 23:56 +0000
            Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use "Carlos E.R." <robin_listas@es.invalid> - 2025-08-19 12:41 +0200
              Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-20 01:07 +0000
                Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Nuno Silva <nunojsilva@invalid.invalid> - 2025-08-20 09:48 +0100
                  Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use The Natural Philosopher <tnp@invalid.invalid> - 2025-08-20 11:13 +0100
                    Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-20 22:40 +0000
                    Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use vallor <vallor@cultnix.org> - 2025-08-21 00:27 +0000
                  ISP router [Was: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] "Carlos E.R." <robin_listas@es.invalid> - 2025-08-20 13:04 +0200
                    Re: ISP router [Was: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] The Natural Philosopher <tnp@invalid.invalid> - 2025-08-20 12:30 +0100
                    Re: ISP router [Was: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-20 22:44 +0000
                      Re: ISP router [Was: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] "Carlos E.R." <robin_listas@es.invalid> - 2025-08-21 12:15 +0200
                        Re: ISP router [Was: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-22 01:18 +0000
                          Re: ISP router [Was: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] "Carlos E.R." <robin_listas@es.invalid> - 2025-08-22 12:45 +0200
                            Re: ISP router [Was: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] The Natural Philosopher <tnp@invalid.invalid> - 2025-08-22 19:37 +0100
                              Re: ISP router [Was: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] "Carlos E.R." <robin_listas@es.invalid> - 2025-08-22 22:32 +0200
                                Re: ISP router [Was: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] The Natural Philosopher <tnp@invalid.invalid> - 2025-08-22 21:56 +0100
                                  Re: ISP router [Was: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-23 00:28 +0000
                                    Re: ISP router [Was: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] rbowman <bowman@montana.com> - 2025-08-23 05:51 +0000
                                      Re: ISP router [Was: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] The Natural Philosopher <tnp@invalid.invalid> - 2025-08-23 11:23 +0100
                                        Re: ISP router [Was: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-23 23:12 +0000
                                          Re: ISP router [Was: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] candycanearter07 <candycanearter07@candycanearter07.nomail.afraid> - 2025-08-29 19:40 +0000
                                            Re: ISP router [Was: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] rbowman <bowman@montana.com> - 2025-08-30 05:59 +0000
                                          Re: ISP router [Was: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-30 06:36 +0000
                                          Re: ISP router [Was: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] Marc Haber <mh+usenetspam1118@zugschl.us> - 2025-08-30 10:36 +0200
                                            Re: ISP router [Was: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-31 01:25 +0000
                                Re: ISP router [Was: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] rbowman <bowman@montana.com> - 2025-08-23 05:43 +0000

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#72805

From	Lawrence D’Oliveiro <ldo@nz.invalid>
Date	2025-08-31 03:25 +0000
Message-ID	<1090fb5$30f6e$1@dont-email.me>
In reply to	#72656

On Fri, 29 Aug 2025 19:16:50 +0100, Mike Scott wrote:

> Oh - the problem in hand. No doubt it's easy when you know: single
> interface, allow all lan traffic, block wan inbound to port 22,
> redirect wan inbound on port 12345 to 22 and pass. Block wan inbound
> otherwise. If anyone has a config snippet to do this, I'd be very
> grateful.

Look at the stages of application of filter hooks here
<https://wiki.nftables.org/wiki-nftables/index.php/Netfilter_hooks>:
there is “ingress”, followed by “prerouting”, followed by “input”.

The obvious place to block incoming packets for port 22 would be
either “ingress” or “prerouting”; you should be able, at the same
stage or a later one, to remap ones destined for port 12345 so they go
to port 22, after the block.

<https://wiki.nftables.org/wiki-nftables/index.php/Mangling_packet_headers>

[toc] | [prev] | [next] | [standalone]

#72715

From	Lawrence D’Oliveiro <ldo@nz.invalid>
Date	2025-08-30 06:34 +0000
Message-ID	<108u61a$2eq9a$4@dont-email.me>
In reply to	#72641

On Fri, 29 Aug 2025 08:10:08 -0700, John Ames wrote:

> On Fri, 29 Aug 2025 00:56:54 -0000 (UTC)
> Lawrence D’Oliveiro <ldo@nz.invalid> wrote:
>>
>> Weren’t you one of those complaining that bare reference material
>> wasn’t enough? That you wanted tutorial examples and how-tos and
>> all that? Then when I mention that it all that is available, you
>> now find a new reason to complain?
>
> Again, when important information for *core networking tools* is
> only found on the Web, it hardly takes a great sage to discern the
> problem.

The problem is, you don’t understand the Web?

Because *everything* is on the Web these days. If you can’t figure out
basic Web searching, then perhaps you should stay away from computers
altogether?

[toc] | [prev] | [next] | [standalone]

#72726

From	Nuno Silva <nunojsilva@invalid.invalid>
Date	2025-08-30 08:39 +0100
Message-ID	<108u9r9$2fqqv$1@dont-email.me>
In reply to	#72715

On 2025-08-30, Lawrence D’Oliveiro wrote:

> On Fri, 29 Aug 2025 08:10:08 -0700, John Ames wrote:
>
>> On Fri, 29 Aug 2025 00:56:54 -0000 (UTC)
>> Lawrence D’Oliveiro <ldo@nz.invalid> wrote:
>>>
>>> Weren’t you one of those complaining that bare reference material
>>> wasn’t enough? That you wanted tutorial examples and how-tos and
>>> all that? Then when I mention that it all that is available, you
>>> now find a new reason to complain?
>>
>> Again, when important information for *core networking tools* is
>> only found on the Web, it hardly takes a great sage to discern the
>> problem.
>
> The problem is, you don’t understand the Web?
>
> Because *everything* is on the Web these days. If you can’t figure out
> basic Web searching, then perhaps you should stay away from computers
> altogether?

If there's no network connectivity, your web search skills won't do
much?

-- 
Nuno Silva

[toc] | [prev] | [next] | [standalone]

#72727

From	The Natural Philosopher <tnp@invalid.invalid>
Date	2025-08-30 08:45 +0100
Message-ID	<108ua78$2f7ql$8@dont-email.me>
In reply to	#72726

On 30/08/2025 08:39, Nuno Silva wrote:
> On 2025-08-30, Lawrence D’Oliveiro wrote:
> 
>> On Fri, 29 Aug 2025 08:10:08 -0700, John Ames wrote:
>>
>>> On Fri, 29 Aug 2025 00:56:54 -0000 (UTC)
>>> Lawrence D’Oliveiro <ldo@nz.invalid> wrote:
>>>>
>>>> Weren’t you one of those complaining that bare reference material
>>>> wasn’t enough? That you wanted tutorial examples and how-tos and
>>>> all that? Then when I mention that it all that is available, you
>>>> now find a new reason to complain?
>>>
>>> Again, when important information for *core networking tools* is
>>> only found on the Web, it hardly takes a great sage to discern the
>>> problem.
>>
>> The problem is, you don’t understand the Web?
>>
>> Because *everything* is on the Web these days. If you can’t figure out
>> basic Web searching, then perhaps you should stay away from computers
>> altogether?
> 
> If there's no network connectivity, your web search skills won't do
> much?
> 

"If your internet connection is down, you can report in on our web page 
here→ and get advice on what to do..."

I quite like Linux Mint in that you get the whole basic distro. I am nor 
sure if they have a 'lite' edition that just boots enough to get 
internet connectivity.

-- 
“People believe certain stories because everyone important tells them, 
and people tell those stories because everyone important believes them. 
Indeed, when a conventional wisdom is at its fullest strength, one’s 
agreement with that conventional wisdom becomes almost a litmus test of 
one’s suitability to be taken seriously.”

Paul Krugman

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#72736

From	Harold Stevens <wookie@trixie.localdomain>
Date	2025-08-30 05:37 -0500
Message-ID	<slrn10b5l36.1h2h.wookie@trixie.localdomain>
In reply to	#72726

In <108u9r9$2fqqv$1@dont-email.me> Nuno Silva:

> If there's no network connectivity, your web search skills won't do much?

Classic Catch-22: To access the net, you need to ... access the net.

Mr Ivory Tower here clearly never dirtied his hands with a workplace
reality. It reads like Milo Minderbinder in the novel.

-- 
Regards, Weird (Harold Stevens) * IMPORTANT EMAIL INFO FOLLOWS *
Pardon any bogus email addresses (wookie) in place for spambots.
Really, it's (wyrd) at att, dotted with net. * DO NOT SPAM IT. *
I toss (404) GoogleGroup (404 http://twovoyagers.com/improve-usenet.org/).

[toc] | [prev] | [next] | [standalone]

#73035

From	John Ames <commodorejohn@gmail.com>
Date	2025-09-02 09:59 -0700
Message-ID	<20250902095956.000001c5@gmail.com>
In reply to	#72736

On Sat, 30 Aug 2025 05:37:26 -0500
Harold Stevens <wookie@trixie.localdomain> wrote:

> > If there's no network connectivity, your web search skills won't do
> > much?  
> 
> Classic Catch-22: To access the net, you need to ... access the net.
> 
> Mr Ivory Tower here clearly never dirtied his hands with a workplace
> reality. It reads like Milo Minderbinder in the novel.

It is truly boggling that this requires explaining, let alone hand-
holding through every step of reasoning it out o_O

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#73036

From	Harold Stevens <wookie@aspen.localdomain>
Date	2025-09-02 12:59 -0500
Message-ID	<slrn10bec41.c4p.wookie@aspen.localdomain>
In reply to	#73035

In <20250902095956.000001c5@gmail.com> John Ames:

[Snip...]

> It is truly boggling that this requires explaining,
> let alone hand-holding through every step of reasoning it out o_O

It's the beauty of being able to ignore workplace reality:

Catch-22 (2/10) Movie CLIP - It's an Egg (1970) HD
https://www.youtube.com/watch?v=g0UV6ug96c0

-- 
Regards, Weird (Harold Stevens) * IMPORTANT EMAIL INFO FOLLOWS *
Pardon any bogus email addresses (wookie) in place for spambots.
Really, it's (wyrd) at att, dotted with net. * DO NOT SPAM IT. *
I toss (404) GoogleGroup (404 http://twovoyagers.com/improve-usenet.org/).

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#72760

From	Richard Kettlewell <invalid@invalid.invalid>
Date	2025-08-30 17:48 +0100
Message-ID	<wwvy0r07o38.fsf@LkoBDZeT.terraraq.uk>
In reply to	#72726

Nuno Silva <nunojsilva@invalid.invalid> writes:
> On 2025-08-30, Lawrence D’Oliveiro wrote:
>> On Fri, 29 Aug 2025 08:10:08 -0700, John Ames wrote:
>>> Lawrence D’Oliveiro <ldo@nz.invalid> wrote:
>>>> Weren’t you one of those complaining that bare reference material
>>>> wasn’t enough? That you wanted tutorial examples and how-tos and
>>>> all that? Then when I mention that it all that is available, you
>>>> now find a new reason to complain?
>>>
>>> Again, when important information for *core networking tools* is
>>> only found on the Web, it hardly takes a great sage to discern the
>>> problem.
>>
>> The problem is, you don’t understand the Web?
>>
>> Because *everything* is on the Web these days. If you can’t figure
>> out basic Web searching, then perhaps you should stay away from
>> computers altogether?
>
> If there's no network connectivity, your web search skills won't do
> much?

Wasn’t this about nftables? You don’t need that to establish network
connectivity.

-- 
https://www.greenend.org.uk/rjk/

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#71697

From	Lawrence D’Oliveiro <ldo@nz.invalid>
Date	2025-08-20 01:01 +0000
Message-ID	<10836pc$1m96$11@dont-email.me>
In reply to	#71642

On Tue, 19 Aug 2025 12:35:53 +0200, Carlos E.R. wrote:

>> What's wrong with a couple of clear examples, plus the detail to expand
>> on them?
>> 
> +1

There’s a whole website devoted to that, as I mentioned elsewhere.

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#71749

From	"Carlos E.R." <robin_listas@es.invalid>
Date	2025-08-20 12:52 +0200
Message-ID	<81mgnlxtf1.ln2@Telcontar.valinor>
In reply to	#71697

On 2025-08-20 03:01, Lawrence D’Oliveiro wrote:
> On Tue, 19 Aug 2025 12:35:53 +0200, Carlos E.R. wrote:
> 
>>> What's wrong with a couple of clear examples, plus the detail to expand
>>> on them?
>>>
>> +1
> 
> There’s a whole website devoted to that, as I mentioned elsewhere.

Not good enough, it should be inside the manuals. Pointing to an 
external website (if it is mentioned on the manual) is akin to "buy our 
excellent book".

-- 
Cheers, Carlos.

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#71797

From	Lawrence D’Oliveiro <ldo@nz.invalid>
Date	2025-08-20 22:36 +0000
Message-ID	<1085im5$j3am$11@dont-email.me>
In reply to	#71749

On Wed, 20 Aug 2025 12:52:56 +0200, Carlos E.R. wrote:

> On 2025-08-20 03:01, Lawrence D’Oliveiro wrote:
>>
>> On Tue, 19 Aug 2025 12:35:53 +0200, Carlos E.R. wrote:
>> 
>>>> What's wrong with a couple of clear examples, plus the detail to
>>>> expand on them?
>>>>
>>> +1
>> 
>> There’s a whole website devoted to that, as I mentioned elsewhere.
> 
> Not good enough, it should be inside the manuals.

The man page has examples, too. Naturally a tutorial/wiki site has more.

Remember what reference documentation is for: it’s to act, no more and no 
less, as the definitive reference to all the details of functionality, not 
to offer hand-holding tutorial recipes for every conceivable thing you 
might want to do with that functionality.

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#71831

From	"Carlos E.R." <robin_listas@es.invalid>
Date	2025-08-21 11:44 +0200
Message-ID	<fd6jnlx2o8.ln2@Telcontar.valinor>
In reply to	#71797

On 2025-08-21 00:36, Lawrence D’Oliveiro wrote:
> On Wed, 20 Aug 2025 12:52:56 +0200, Carlos E.R. wrote:
> 
>> On 2025-08-20 03:01, Lawrence D’Oliveiro wrote:
>>>
>>> On Tue, 19 Aug 2025 12:35:53 +0200, Carlos E.R. wrote:
>>>
>>>>> What's wrong with a couple of clear examples, plus the detail to
>>>>> expand on them?
>>>>>
>>>> +1
>>>
>>> There’s a whole website devoted to that, as I mentioned elsewhere.
>>
>> Not good enough, it should be inside the manuals.
> 
> The man page has examples, too. Naturally a tutorial/wiki site has more.
> 
> Remember what reference documentation is for: it’s to act, no more and no
> less, as the definitive reference to all the details of functionality, not
> to offer hand-holding tutorial recipes for every conceivable thing you
> might want to do with that functionality.

I do not want reference documentation.

I primarily want documentation that allows me to start using a new 
program, fast, and to achieve my goals.

Once I have that, I want the reference documentation.

-- 
Cheers, Carlos.

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#71841

From	The Natural Philosopher <tnp@invalid.invalid>
Date	2025-08-21 11:34 +0100
Message-ID	<1086snp$rgpt$19@dont-email.me>
In reply to	#71831

On 21/08/2025 10:44, Carlos E.R. wrote:
> I do not want reference documentation.
> 
> I primarily want documentation that allows me to start using a new 
> program, fast, and to achieve my goals.
> 
> Once I have that, I want the reference documentation.

+1001


-- 
“The ultimate result of shielding men from the effects of folly is to 
fill the world with fools.”

Herbert Spencer

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#71853

From	"Carlos E.R." <robin_listas@es.invalid>
Date	2025-08-21 14:36 +0200
Message-ID	<ffgjnlxeqh.ln2@Telcontar.valinor>
In reply to	#71841

On 2025-08-21 12:34, The Natural Philosopher wrote:
> On 21/08/2025 10:44, Carlos E.R. wrote:
>> I do not want reference documentation.
>>
>> I primarily want documentation that allows me to start using a new 
>> program, fast, and to achieve my goals.
>>
>> Once I have that, I want the reference documentation.
> 
> +1001

Yesterday, I wanted to share a video on WhatsApp. It was taken by a 
wildlife camera, and WhatsApp refused, said the video was not compatible.

First I tried avidemux, but still WhasApp refused.

I'm familiar with ffmpeg, I know it can do it. But it has a huge manual 
(which I have read), and they change the CLI interface often enough so 
that recipes I have in my notes no longer work. Finding the concoction 
will need a lot of time. So I can google, I can ask somewhere and wait, 
or I can ask ChatGpt. I did the later.

I got a reply that missed the output file (is that an hallucination or a 
"human" mistake?):

ffmpeg -i IMAG0009.avi -vf "scale=640:-2" -c:v libx264 -profile:v \
    baseline -level 3.0 -preset fast -c:a aac -b:a 128k \
    -movflags +faststart

To that I added "bird.avi" as output file, but WhatsApp rejected it. So 
I told ChatGpt all that. It replied giving me the missing data:

ffmpeg -i IMAG0009.avi -vf "scale=640:-2" -c:v libx264 -profile:v \
    baseline -level 3.0 -preset fast -c:a aac -b:a 128k \
    -movflags +faststart bird_whatsapp.mp4

and that worked. Having that command line, I modified it easily for more 
resolution (scale=1024:-2). I was already familiar with all the options, 
I just needed to find which would produce the wanted result, and not 
spend a day on it.

But if I want to find in the manual what "-b" stands for, I fail. Ask 
chatgpt, instant reply, it is bitrate. Oh, yes, I remember now.

:-)

Oh, searching the man for "movflags" or "faststart" fails. So ask the 
AI. They are in the man page for the MP3 muxer, it says. Oh, right, I 
forgot that.

So, even a reference manual is hard to use when you want to find a 
particular reference, basically using "grep".

-- 
Cheers, Carlos.

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#71855

From	Nuno Silva <nunojsilva@invalid.invalid>
Date	2025-08-21 14:27 +0100
Message-ID	<10876rt$v4bp$1@dont-email.me>
In reply to	#71853

On 2025-08-21, Carlos E.R. wrote:

> On 2025-08-21 12:34, The Natural Philosopher wrote:
>> On 21/08/2025 10:44, Carlos E.R. wrote:
>>> I do not want reference documentation.
>>>
>>> I primarily want documentation that allows me to start using a new
>>> program, fast, and to achieve my goals.
>>>
>>> Once I have that, I want the reference documentation.
>>
>> +1001
[...]
> To that I added "bird.avi" as output file, but WhatsApp rejected
> it. So I told ChatGpt all that. It replied giving me the missing data:
>
> ffmpeg -i IMAG0009.avi -vf "scale=640:-2" -c:v libx264 -profile:v \
>    baseline -level 3.0 -preset fast -c:a aac -b:a 128k \
>    -movflags +faststart bird_whatsapp.mp4
>
> and that worked. Having that command line, I modified it easily for
> more resolution (scale=1024:-2). I was already familiar with all the
> options, I just needed to find which would produce the wanted result,
> and not spend a day on it.
>
>
> But if I want to find in the manual what "-b" stands for, I fail. Ask
> chatgpt, instant reply, it is bitrate. Oh, yes, I remember now.
>
> :-)
>
>
> Oh, searching the man for "movflags" or "faststart" fails. So ask the
> AI. They are in the man page for the MP3 muxer, it says. Oh, right, I
> forgot that.
>
>
> So, even a reference manual is hard to use when you want to find a
> particular reference, basically using "grep".

(ffmpeg's online manual is spread over more than one page, isn't it?)

-- 
Nuno Silva

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#71865

From	"Carlos E.R." <robin_listas@es.invalid>
Date	2025-08-21 21:37 +0200
Message-ID	<359knlxqhi.ln2@Telcontar.valinor>
In reply to	#71855

On 2025-08-21 15:27, Nuno Silva wrote:
> On 2025-08-21, Carlos E.R. wrote:
> 
>> On 2025-08-21 12:34, The Natural Philosopher wrote:
>>> On 21/08/2025 10:44, Carlos E.R. wrote:
>>>> I do not want reference documentation.
>>>>
>>>> I primarily want documentation that allows me to start using a new
>>>> program, fast, and to achieve my goals.
>>>>
>>>> Once I have that, I want the reference documentation.
>>>
>>> +1001
> [...]
>> To that I added "bird.avi" as output file, but WhatsApp rejected
>> it. So I told ChatGpt all that. It replied giving me the missing data:
>>
>> ffmpeg -i IMAG0009.avi -vf "scale=640:-2" -c:v libx264 -profile:v \
>>     baseline -level 3.0 -preset fast -c:a aac -b:a 128k \
>>     -movflags +faststart bird_whatsapp.mp4
>>
>> and that worked. Having that command line, I modified it easily for
>> more resolution (scale=1024:-2). I was already familiar with all the
>> options, I just needed to find which would produce the wanted result,
>> and not spend a day on it.
>>
>>
>> But if I want to find in the manual what "-b" stands for, I fail. Ask
>> chatgpt, instant reply, it is bitrate. Oh, yes, I remember now.
>>
>> :-)
>>
>>
>> Oh, searching the man for "movflags" or "faststart" fails. So ask the
>> AI. They are in the man page for the MP3 muxer, it says. Oh, right, I
>> forgot that.
>>
>>
>> So, even a reference manual is hard to use when you want to find a
>> particular reference, basically using "grep".
> 
> (ffmpeg's online manual is spread over more than one page, isn't it?)

Yes.

I don't know right now if there is a command that would search all 
manuals and find a word.

cer@Telcontar:~> apropos movflags
movflags: nothing appropriate.
cer@Telcontar:~>


-- 
Cheers, Carlos.

[toc] | [prev] | [next] | [standalone]

#71901

From	Nuno Silva <nunojsilva@invalid.invalid>
Date	2025-08-22 10:33 +0100
Message-ID	<1089di2$1f8lv$3@dont-email.me>
In reply to	#71865

On 2025-08-21, Carlos E.R. wrote:

> On 2025-08-21 15:27, Nuno Silva wrote:
>> On 2025-08-21, Carlos E.R. wrote:
>>
>>> On 2025-08-21 12:34, The Natural Philosopher wrote:
>>>> On 21/08/2025 10:44, Carlos E.R. wrote:
>>>>> I do not want reference documentation.
>>>>>
>>>>> I primarily want documentation that allows me to start using a new
>>>>> program, fast, and to achieve my goals.
>>>>>
>>>>> Once I have that, I want the reference documentation.
>>>>
>>>> +1001
>> [...]
>>> To that I added "bird.avi" as output file, but WhatsApp rejected
>>> it. So I told ChatGpt all that. It replied giving me the missing data:
>>>
>>> ffmpeg -i IMAG0009.avi -vf "scale=640:-2" -c:v libx264 -profile:v \
>>>     baseline -level 3.0 -preset fast -c:a aac -b:a 128k \
>>>     -movflags +faststart bird_whatsapp.mp4
>>>
>>> and that worked. Having that command line, I modified it easily for
>>> more resolution (scale=1024:-2). I was already familiar with all the
>>> options, I just needed to find which would produce the wanted result,
>>> and not spend a day on it.
>>>
>>>
>>> But if I want to find in the manual what "-b" stands for, I fail. Ask
>>> chatgpt, instant reply, it is bitrate. Oh, yes, I remember now.
>>>
>>> :-)
>>>
>>>
>>> Oh, searching the man for "movflags" or "faststart" fails. So ask the
>>> AI. They are in the man page for the MP3 muxer, it says. Oh, right, I
>>> forgot that.
>>>
>>>
>>> So, even a reference manual is hard to use when you want to find a
>>> particular reference, basically using "grep".
>>
>> (ffmpeg's online manual is spread over more than one page, isn't it?)
>
> Yes.
>
> I don't know right now if there is a command that would search all
> manuals and find a word.
>
> cer@Telcontar:~> apropos movflags
> movflags: nothing appropriate.
> cer@Telcontar:~>

At least here, perhaps "man -w -K movflags". Turns up ffmpeg-all and ffmpeg-formats.

(But no, I wasn't aware of this, had to check "man man", so maybe
there's some better man flag, or separate utility that I'm not aware of
(besides plain grep on the man pages where possible, I guess).)

-- 
Nuno Silva

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#71911 — Manuals [Was: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use]

From	"Carlos E.R." <robin_listas@es.invalid>
Date	2025-08-22 12:39 +0200
Subject	Manuals [Was: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use]
Message-ID	<tvtlnlx5rc.ln2@Telcontar.valinor>
In reply to	#71901

On 2025-08-22 11:33, Nuno Silva wrote:
> On 2025-08-21, Carlos E.R. wrote:
>> On 2025-08-21 15:27, Nuno Silva wrote:
>>> On 2025-08-21, Carlos E.R. wrote:
>>>> On 2025-08-21 12:34, The Natural Philosopher wrote:
>>>>> On 21/08/2025 10:44, Carlos E.R. wrote:
>>>>>> I do not want reference documentation.
>>>>>>
>>>>>> I primarily want documentation that allows me to start using a new
>>>>>> program, fast, and to achieve my goals.
>>>>>>
>>>>>> Once I have that, I want the reference documentation.
>>>>>
>>>>> +1001
>>> [...]
>>>> To that I added "bird.avi" as output file, but WhatsApp rejected
>>>> it. So I told ChatGpt all that. It replied giving me the missing data:
>>>>
>>>> ffmpeg -i IMAG0009.avi -vf "scale=640:-2" -c:v libx264 -profile:v \
>>>>      baseline -level 3.0 -preset fast -c:a aac -b:a 128k \
>>>>      -movflags +faststart bird_whatsapp.mp4
>>>>
>>>> and that worked. Having that command line, I modified it easily for
>>>> more resolution (scale=1024:-2). I was already familiar with all the
>>>> options, I just needed to find which would produce the wanted result,
>>>> and not spend a day on it.
>>>>
>>>>
>>>> But if I want to find in the manual what "-b" stands for, I fail. Ask
>>>> chatgpt, instant reply, it is bitrate. Oh, yes, I remember now.
>>>>
>>>> :-)
>>>>
>>>>
>>>> Oh, searching the man for "movflags" or "faststart" fails. So ask the
>>>> AI. They are in the man page for the MP3 muxer, it says. Oh, right, I
>>>> forgot that.
>>>>
>>>>
>>>> So, even a reference manual is hard to use when you want to find a
>>>> particular reference, basically using "grep".
>>>
>>> (ffmpeg's online manual is spread over more than one page, isn't it?)
>>
>> Yes.
>>
>> I don't know right now if there is a command that would search all
>> manuals and find a word.
>>
>> cer@Telcontar:~> apropos movflags
>> movflags: nothing appropriate.
>> cer@Telcontar:~>
> 
> At least here, perhaps "man -w -K movflags". Turns up ffmpeg-all and ffmpeg-formats.
> 
cer@Telcontar:~> time man -w -K movflags
/usr/share/man/man1/ffserver-all.1.gz
/usr/share/man/man1/ffmpeg-all.1.gz
/usr/share/man/man1/ffmpeg-formats.1.gz

real	0m52,869s
user	0m31,563s
sys	0m29,066s
cer@Telcontar:~>

Hum. New command. Long version:
  man --where --path --location --global-apropos movflags



        -w, --where, --path, --location
               Don't actually display the manual pages,
               but  do  print  the  location(s)  of the
               source nroff files that would be format-
               ted.

        -k, --apropos
               Equivalent to apropos.  Search the short
               manual  page  descriptions  for keywords
               and display any matches.  See apropos(1)
               for details.

        -K, --global-apropos
               Search  for  text  in  all manual pages.
               This is a  brute-force  search,  and  is
               likely  to  take  some time; if you can,
               you should specify a section  to  reduce
               the  number  of  pages  that  need to be
               searched.  Search terms  may  be  simple
               strings  (the  default),  or regular ex-
               pressions if the --regex option is used.

               Note that this searches the  sources  of
               the manual pages, not the rendered text,
               and so may include false  positives  due
               to things like comments in source files.
               Searching the  rendered  text  would  be
               much slower.



I don't see how I could replicate this with the apropos command :-?

        apropos - search the manual page names and descriptions

so, not the bodies.


> (But no, I wasn't aware of this, had to check "man man", so maybe
> there's some better man flag, or separate utility that I'm not aware of
> (besides plain grep on the man pages where possible, I guess).)
> 

Maybe. I seem to recall having done this before, but perhaps not.

-- 
Cheers, Carlos.

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#71891

From	Lawrence D’Oliveiro <ldo@nz.invalid>
Date	2025-08-22 01:12 +0000
Message-ID	<1088g5e$19b27$5@dont-email.me>
In reply to	#71853

On Thu, 21 Aug 2025 14:36:30 +0200, Carlos E.R. wrote:

> Oh, searching the man for "movflags" or "faststart" fails. So ask the
> AI. They are in the man page for the MP3 muxer, it says. Oh, right, I
> forgot that.

No they aren’t. They’re part of QuickTime.

    ffmpeg -h muxer=mov

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#71890

From	Lawrence D’Oliveiro <ldo@nz.invalid>
Date	2025-08-22 01:06 +0000
Message-ID	<1088fr9$19b27$4@dont-email.me>
In reply to	#71831

On Thu, 21 Aug 2025 11:44:47 +0200, Carlos E.R. wrote:

> I do not want reference documentation.

Then you can’t work in this field.

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Page 3 of 6 — ← Prev page 1 2 [3] 4 5 6 Next page →

csiph-web

Yes, You Need A Firewall On Linux - Here’s Why And Which To Use

Contents

#72805

#72715

#72726

#72727

#72736

#73035

#73036

#72760

#71697

#71749

#71797

#71831

#71841

#71853

#71855

#71865

#71901

#71911 — Manuals [Was: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use]

#71891

#71890