Groups > comp.os.linux.networking > #4643

Re: ftp,ssh,http blocked by ISP?

From	William Unruh <unruh@invalid.ca>
Newsgroups	comp.os.linux.networking
Subject	Re: ftp,ssh,http blocked by ISP?
Date	2020-07-18 22:13 +0000
Organization	A noiseless patient Spider
Message-ID	<revs5j$td2$2@dont-email.me> (permalink)
References	<reuqg2$cvg$1@dont-email.me> <revbbl$i05$1@dont-email.me> <revd45$fc$1@dont-email.me> <revfg9$h8d$1@dont-email.me> <revh7v$qem$1@dont-email.me>

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On 2020-07-18, Bob Tennent <rdtennent@tennent.ca> wrote:
> On Sat, 18 Jul 2020 14:36:56 -0400, Lew Pitcher wrote:
> > On July 18, 2020 13:56, Bob Tennent wrote:
> >
> >> On Sat, 18 Jul 2020 13:26:11 -0400, Lew Pitcher wrote:
> >>  >
> >>  >> How can I test/confirm the conjecture?
> >>  >
> >>  > You could portscan your internet-facing IP address from outside
> >>  > your lan. You could use
> >>  > https://pentest-tools.com/network-vulnerability-scanning/
> >>      tcp-port-scanner-online-nmap
> >> 
> >> That looks promising but the free scan at least gives up if
> >> pings are blocked. A ping-free scan is mentioned but I don't
> >> know how to enable it.
> >> 
> >> Could I install nmap on a cloud computer and scan with that?
> >
> > Certainly. Most of the portscan websites that I've looked into use nmap 
> > under the covers. 
>
> OK, done.  But man nmap is completely incomprehensible to me.  I know
> pings are blocked so I need -Pn.  When I do nmap -Pn myhost I get
>
> 998 filtered ports
> 22/tcp closed
> 50001 open
>
> I could move my ftp and http stuff to the cloud computer.
> That leaves ssh as the only essential service. If assume 22
> and 22xx are blocked, could I use 50001 as my ssh port?

You can use any number you want as your ssh port (of course if it is the
number of some crucial service then that could cause trouble) Then on
your router port forward that port to the computer/port you actually want to use. 

So, in your router port forward port 7916 to port 22 on your own
machine. Then have your remote machines connect via ssh to port 7916.
ssh -p 7916 <address of your router>

Thread

ftp,ssh,http blocked by ISP? Bob Tennent <rdtennent@tennent.ca> - 2020-07-18 12:38 +0000
  Re: ftp,ssh,http blocked by ISP? Dan Purgert <dan@djph.net> - 2020-07-18 14:59 +0000
    Re: ftp,ssh,http blocked by ISP? William Unruh <unruh@invalid.ca> - 2020-07-18 15:15 +0000
      Re: ftp,ssh,http blocked by ISP? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2020-07-18 20:01 +0300
        Re: ftp,ssh,http blocked by ISP? William Unruh <unruh@invalid.ca> - 2020-07-18 22:06 +0000
    Re: ftp,ssh,http blocked by ISP? Bob Tennent <rdtennent@tennent.ca> - 2020-07-18 16:35 +0000
  Re: ftp,ssh,http blocked by ISP? Ken Hart <kwhart1@frontier.com> - 2020-07-18 11:12 -0400
    Re: ftp,ssh,http blocked by ISP? Bob Tennent <rdtennent@tennent.ca> - 2020-07-18 16:44 +0000
  Re: ftp,ssh,http blocked by ISP? John McCue <jmccue@jmclin1.hsd1.ma.comcast.net> - 2020-07-18 16:33 +0000
  Re: ftp,ssh,http blocked by ISP? Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2020-07-18 13:26 -0400
    Re: ftp,ssh,http blocked by ISP? Bob Tennent <rdtennent@tennent.ca> - 2020-07-18 17:56 +0000
      Re: ftp,ssh,http blocked by ISP? Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2020-07-18 14:36 -0400
        Re: ftp,ssh,http blocked by ISP? Bob Tennent <rdtennent@tennent.ca> - 2020-07-18 19:06 +0000
          Re: ftp,ssh,http blocked by ISP? William Unruh <unruh@invalid.ca> - 2020-07-18 22:13 +0000
            Re: ftp,ssh,http blocked by ISP? "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2020-07-18 19:36 -0400
              Re: ftp,ssh,http blocked by ISP? "Carlos E.R." <robin_listas@es.invalid> - 2020-07-19 12:56 +0200
                Re: ftp,ssh,http blocked by ISP? Johann Beretta <beretta@nun-ya-bizness.com> - 2020-07-28 21:26 -0700
                Re: ftp,ssh,http blocked by ISP? "Carlos E.R." <robin_listas@es.invalid> - 2020-07-29 10:40 +0200
                Re: ftp,ssh,http blocked by ISP? Johann Beretta <beretta@nun-ya-bizness.com> - 2020-08-01 21:22 -0700
                Re: ftp,ssh,http blocked by ISP? "Carlos E.R." <robin_listas@es.invalid> - 2020-08-02 13:16 +0200
                Re: ftp,ssh,http blocked by ISP? Johann Beretta <beretta@nun-ya-bizness.com> - 2020-08-03 13:57 -0700
                Re: ftp,ssh,http blocked by ISP? "Carlos E.R." <robin_listas@es.invalid> - 2020-08-03 23:07 +0200
            Re: ftp,ssh,http blocked by ISP? Bob Tennent <rdtennent@tennent.ca> - 2020-07-19 01:40 +0000
              Re: ftp,ssh,http blocked by ISP? "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2020-07-18 22:10 -0400
              Re: ftp,ssh,http blocked by ISP? "Carlos E.R." <robin_listas@es.invalid> - 2020-07-19 12:59 +0200
  Re: ftp,ssh,http blocked by ISP? Giovanni <lsodgf0@home.net.it> - 2020-07-19 10:10 +0200
  Re: ftp,ssh,http blocked by ISP? Marc Haber <mh+usenetspam1118@zugschl.us> - 2020-07-19 15:09 +0200
    Re: ftp,ssh,http blocked by ISP? William Unruh <unruh@invalid.ca> - 2020-07-19 17:35 +0000
      Re: ftp,ssh,http blocked by ISP? Bob Tennent <rdtennent@tennent.ca> - 2020-07-20 02:33 +0000
        Re: ftp,ssh,http blocked by ISP? William Unruh <unruh@invalid.ca> - 2020-07-20 02:55 +0000
        Re: ftp,ssh,http blocked by ISP? "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2020-07-19 23:32 -0400
        Re: ftp,ssh,http blocked by ISP? "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2020-07-19 23:46 -0400
          Re: ftp,ssh,http blocked by ISP? Bob Tennent <rdtennent@tennent.ca> - 2020-07-20 06:01 +0000
            Re: ftp,ssh,http blocked by ISP? "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2020-07-20 20:16 -0400
            Re: ftp,ssh,http blocked by ISP? Johann Beretta <beretta@nun-ya-bizness.com> - 2020-08-01 21:24 -0700
        Re: ftp,ssh,http blocked by ISP? Giovanni <lsodgf0@home.net.it> - 2020-07-20 09:10 +0200
          Re: ftp,ssh,http blocked by ISP? Bob Tennent <rdtennent@tennent.ca> - 2020-07-20 11:31 +0000
            Re: ftp,ssh,http blocked by ISP? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2020-07-20 17:49 +0300
              Re: ftp,ssh,http blocked by ISP? Bob Tennent <rdtennent@tennent.ca> - 2020-07-20 15:32 +0000
                Re: ftp,ssh,http blocked by ISP? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2020-07-20 21:01 +0300
                Re: ftp,ssh,http blocked by ISP? Bit Twister <BitTwister@mouse-potato.com> - 2020-07-20 13:04 -0500
            Re: ftp,ssh,http blocked by ISP? William Unruh <unruh@invalid.ca> - 2020-07-20 20:11 +0000
              Re: ftp,ssh,http blocked by ISP? Bob Tennent <rdtennent@tennent.ca> - 2020-07-20 20:42 +0000
                Re: ftp,ssh,http blocked by ISP? William Unruh <unruh@invalid.ca> - 2020-07-20 21:11 +0000
                Re: ftp,ssh,http blocked by ISP? Bob Tennent <rdtennent@tennent.ca> - 2020-07-21 01:52 +0000
                Re: ftp,ssh,http blocked by ISP? dyrmak <dyrmak@quelite.terre.invalid> - 2020-07-21 08:35 +0000
  Re: ftp,ssh,http blocked by ISP? Bob Tennent <rdtennent@tennent.ca> - 2020-07-21 10:34 +0000
    Re: ftp,ssh,http blocked by ISP? Giovanni <lsodgf0@home.net.it> - 2020-07-21 13:48 +0200
      Re: ftp,ssh,http blocked by ISP? Bob Tennent <rdtennent@tennent.ca> - 2020-07-21 13:35 +0000
        Re: ftp,ssh,http blocked by ISP? "Carlos E.R." <robin_listas@es.invalid> - 2020-07-21 16:03 +0200

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