Re: Spurious ARP entries...

From	The Natural Philosopher <tnp@invalid.invalid>
Newsgroups	comp.os.linux.misc
Subject	Re: Spurious ARP entries...
Date	2025-07-18 11:05 +0100
Organization	A little, after lunch
Message-ID	<105d68m$1voed$9@dont-email.me> (permalink)
References	(9 earlier) <1058qjr$riau$5@dont-email.me> <1058rpk$s48h$2@dont-email.me> <TKmcnSKbeu47NeX1nZ2dnZfqn_oAAAAA@giganews.com> <105ac9e$17r8e$1@dont-email.me> <w6OcneWaZNEgKeT1nZ2dnZfqnPqdnZ2d@giganews.com>

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On 18/07/2025 03:42, c186282 wrote:
> On 7/17/25 4:29 AM, Pancho wrote:
>> On 7/17/25 08:38, c186282 wrote:
>>
>>>>>
>>>> I use  DHCP static mappings for most of my LAN devices. I can't 
>>>> quite remember why, but I think it is because I commonly experienced 
>>>> problems with my router DNS server, so it was useful to know an IP.
>>>
>>>    After suffering with fickle DHCP, I changed all my
>>>    office boxes/devices to static. THEN you knew where
>>>    everything was.
>>
>> The problem was not DHCP. DHCP allocated IP addresses and registered 
>> the host names  on the LAN DNS server (dnsmasq or unbound). I found 
>> DHCP very reliable.
> 
>    "Reliable" is a somewhat context-sensitive def here.
>    Yes, DHCP will easily assign an address, but MAY decide
>    to CHANGE it later, and/or not quite forget where the
>    old address was. It is possible to query to find what
>    the (current) address of a PC/device is, based mostly
>    on a couple kinds of naming features. However that's
>    not nearly as clean as a static IP. Why add layers
>    and layers to what SHOULD be simple ?
> 

Yeah,. Right, A trusted vistor comes into your office and says 'may I 
use your internet connection., and you wrest his laptop or mobile phone 
from him, install a fixed IP address having looked up in the paper log 
of already allocated IP addresses to make sure it doesn't collide, add 
in te DNS address and te default route and you hand it back and say 'go 
ahead'

Or you run DHCP and say 'SSID is 'guest', and the password is 
stlnkingBishop' and that is that.

>> The problem was the LAN  DNS server, on my router, froze occasionally, 
>> stopped responding to queries, all queries. Pretty catastrophic in 
>> itself, but I could still use some LAN services if I knew the IP address.
> 
>    Yep. Happens.

...To people who cant configure servers

> 
>    As said, for "home" use DHCP is OK ... but if you're
>    biz/govt and have 200+ devices - really might want to
>    think about static. A little more trouble, but it'll
>    get you OUT of other kinds of trouble.

It was precisely when we got to 200 users on static addresses and the 
nightmare of having to set each one up individually that the blessings 
of DHCP became  apparent
Static is OK for home, or a small number of servers, but for offices 
full of clients its a fucking nightmare.

You soon find out what happens when people modify their setup to be on 
someone else's IP addresses.

-- 
It’s easier to fool people than to convince them that they have been fooled.
Mark Twain

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Thread

Spurious ARP entries... The Natural Philosopher <tnp@invalid.invalid> - 2025-07-12 11:30 +0100
  Re: Spurious ARP entries... Robert Heller <heller@deepsoft.com> - 2025-07-12 10:36 +0000
    Re: Spurious ARP entries... The Natural Philosopher <tnp@invalid.invalid> - 2025-07-12 11:52 +0100
  Re: Spurious ARP entries... Andy Burns <usenet@andyburns.uk> - 2025-07-12 11:41 +0100
    Re: Spurious ARP entries... The Natural Philosopher <tnp@invalid.invalid> - 2025-07-12 11:54 +0100
      Re: Spurious ARP entries... Andy Burns <usenet@andyburns.uk> - 2025-07-12 12:14 +0100
        Re: Spurious ARP entries... The Natural Philosopher <tnp@invalid.invalid> - 2025-07-12 13:06 +0100
          Re: Spurious ARP entries... Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-07-13 01:20 +0000
            Re: Spurious ARP entries... c186282 <c186282@nnada.net> - 2025-07-13 00:16 -0400
              Re: Spurious ARP entries... The Natural Philosopher <tnp@invalid.invalid> - 2025-07-13 12:01 +0100
                Re: Spurious ARP entries... Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-07-13 22:10 +0000
                Re: Spurious ARP entries... "Carlos E.R." <robin_listas@es.invalid> - 2025-07-14 10:19 +0200
                Re: Spurious ARP entries... The Natural Philosopher <tnp@invalid.invalid> - 2025-07-14 14:54 +0100
                Re: Spurious ARP entries... "Carlos E.R." <robin_listas@es.invalid> - 2025-07-15 11:58 +0200
                Re: Spurious ARP entries... The Natural Philosopher <tnp@invalid.invalid> - 2025-07-15 15:20 +0100
                Re: Spurious ARP entries... "Carlos E.R." <robin_listas@es.invalid> - 2025-07-16 11:21 +0200
                Re: Spurious ARP entries... The Natural Philosopher <tnp@invalid.invalid> - 2025-07-16 16:46 +0100
                Re: Spurious ARP entries... c186282 <c186282@nnada.net> - 2025-07-15 22:10 -0400
  Re: Spurious ARP entries... Richard Kettlewell <invalid@invalid.invalid> - 2025-07-12 11:43 +0100
    Re: Spurious ARP entries... The Natural Philosopher <tnp@invalid.invalid> - 2025-07-12 12:02 +0100
  Re: Spurious ARP entries... c186282 <c186282@nnada.net> - 2025-07-12 19:33 -0400
    Re: Spurious ARP entries... The Natural Philosopher <tnp@invalid.invalid> - 2025-07-13 11:52 +0100
      Re: Spurious ARP entries... c186282 <c186282@nnada.net> - 2025-07-14 00:08 -0400
  Re: Spurious ARP entries... Shadow <Sh@dow.br> - 2025-07-12 21:29 -0300
    Re: Spurious ARP entries... Robert Heller <heller@deepsoft.com> - 2025-07-13 00:55 +0000
      Re: Spurious ARP entries... Andy Burns <usenet@andyburns.uk> - 2025-07-13 06:35 +0100
        Re: Spurious ARP entries... c186282 <c186282@nnada.net> - 2025-07-13 02:30 -0400
          Re: Spurious ARP entries... John Ames <commodorejohn@gmail.com> - 2025-07-14 08:06 -0700
            Re: Spurious ARP entries... Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-07-14 22:05 +0000
              Re: Spurious ARP entries... c186282 <c186282@nnada.net> - 2025-07-15 22:21 -0400
                Re: Spurious ARP entries... Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2025-07-16 15:53 +0000
                Re: Spurious ARP entries... The Natural Philosopher <tnp@invalid.invalid> - 2025-07-16 19:19 +0100
                Re: Spurious ARP entries... c186282 <c186282@nnada.net> - 2025-07-17 03:13 -0400
              Re: Spurious ARP entries... John Ames <commodorejohn@gmail.com> - 2025-07-16 08:05 -0700
                Re: Spurious ARP entries... The Natural Philosopher <tnp@invalid.invalid> - 2025-07-16 16:47 +0100
                Re: Spurious ARP entries... John Ames <commodorejohn@gmail.com> - 2025-07-16 09:02 -0700
                Re: Spurious ARP entries... The Natural Philosopher <tnp@invalid.invalid> - 2025-07-16 19:17 +0100
                Re: Spurious ARP entries... c186282 <c186282@nnada.net> - 2025-07-17 03:10 -0400
                Re: Spurious ARP entries... c186282 <c186282@nnada.net> - 2025-07-17 03:08 -0400
                Re: Spurious ARP entries... Richard Kettlewell <invalid@invalid.invalid> - 2025-07-16 19:18 +0100
                Re: Spurious ARP entries... The Natural Philosopher <tnp@invalid.invalid> - 2025-07-16 19:21 +0100
                Re: Spurious ARP entries... Pancho <Pancho.Jones@protonmail.com> - 2025-07-16 19:41 +0100
                Re: Spurious ARP entries... Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-07-17 02:15 +0000
                Re: Spurious ARP entries... c186282 <c186282@nnada.net> - 2025-07-17 03:38 -0400
                Re: Spurious ARP entries... Pancho <Pancho.Jones@protonmail.com> - 2025-07-17 09:29 +0100
                Re: Spurious ARP entries... The Natural Philosopher <tnp@invalid.invalid> - 2025-07-17 09:46 +0100
                Re: Spurious ARP entries... Pancho <Pancho.Jones@protonmail.com> - 2025-07-17 10:39 +0100
                Re: Spurious ARP entries... c186282 <c186282@nnada.net> - 2025-07-17 22:53 -0400
                Re: Spurious ARP entries... Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-07-18 05:50 +0000
                Re: Spurious ARP entries... c186282 <c186282@nnada.net> - 2025-07-18 02:11 -0400
                Re: Spurious ARP entries... c186282 <c186282@nnada.net> - 2025-07-17 22:42 -0400
                Re: Spurious ARP entries... The Natural Philosopher <tnp@invalid.invalid> - 2025-07-18 11:05 +0100
                Re: Spurious ARP entries... Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-07-18 23:19 +0000
                Re: Spurious ARP entries... c186282 <c186282@nnada.net> - 2025-07-18 23:06 -0400
                Re: Spurious ARP entries... Pancho <Pancho.Jones@protonmail.com> - 2025-07-19 10:50 +0100
                Re: Spurious ARP entries... c186282 <c186282@nnada.net> - 2025-07-17 03:15 -0400
                Re: Spurious ARP entries... The Natural Philosopher <tnp@invalid.invalid> - 2025-07-17 09:50 +0100
                Re: Spurious ARP entries... c186282 <c186282@nnada.net> - 2025-07-17 22:48 -0400
                Re: Spurious ARP entries... John Ames <commodorejohn@gmail.com> - 2025-07-18 09:02 -0700
                Re: Spurious ARP entries... Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-07-18 05:48 +0000
                Re: Spurious ARP entries... c186282 <c186282@nnada.net> - 2025-07-17 03:41 -0400
                Re: Spurious ARP entries... Richard Kettlewell <invalid@invalid.invalid> - 2025-07-17 11:19 +0100
                Re: Spurious ARP entries... c186282 <c186282@nnada.net> - 2025-07-17 22:58 -0400
                Re: Spurious ARP entries... Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-07-17 02:14 +0000
                Re: Spurious ARP entries... John Ames <commodorejohn@gmail.com> - 2025-07-17 07:52 -0700
                Re: Spurious ARP entries... The Natural Philosopher <tnp@invalid.invalid> - 2025-07-17 19:59 +0100
                Re: Spurious ARP entries... Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-07-18 05:47 +0000
            Re: Spurious ARP entries... c186282 <c186282@nnada.net> - 2025-07-15 22:20 -0400
  Re: Spurious ARP entries... jayjwa <jayjwa@atr2.ath.cx.invalid> - 2025-07-13 13:03 -0400
    Re: Spurious ARP entries... The Natural Philosopher <tnp@invalid.invalid> - 2025-07-13 21:46 +0100
      Re: Spurious ARP entries... vallor <vallor@cultnix.org> - 2025-07-13 22:14 +0000
      Re: Spurious ARP entries... c186282 <c186282@nnada.net> - 2025-07-14 00:10 -0400

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