Re: Spurious ARP entries...

Subject	Re: Spurious ARP entries...
Newsgroups	comp.os.linux.misc
References	<104tdg2$22i42$14@dont-email.me>
From	c186282 <c186282@nnada.net>
Date	2025-07-12 19:33 -0400
Message-ID	<9LCdnVkd__WVbO_1nZ2dnZfqn_adnZ2d@giganews.com> (permalink)

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On 7/12/25 6:30 AM, The Natural Philosopher wrote:
> 
> For unrelated reasons I took a look at my desktop ARP cache just now..
> 
> $arp -a
> _gateway (192.168.0.254) at 00:1d:aa:79:78:40 [ether] on eno1
> pifi2 (192.168.0.202) at 2c:cf:67:88:c9:4b [ether] on eno1
> ? (192.168.0.248) at <incomplete> on eno1
> ? (192.168.0.2) at 1c:5a:3e:7e:37:1f [ether] on eno1
> ? (192.168.0.221) at <incomplete> on eno1
> ? (192.168.0.223) at <incomplete> on eno1
> Coriolanus (192.168.0.101) at d8:3a:dd:85:22:b1 [ether] on eno1
> ? (192.168.0.141) at <incomplete> on eno1
> ? (192.168.0.10) at <incomplete> on eno1
> ? (192.168.0.58) at <incomplete> on eno1
> ? (192.168.0.247) at <incomplete> on eno1
> heating-controller (192.168.0.201) at b8:27:eb:c3:31:3d [ether] on eno1
> ? (192.168.0.27) at <incomplete> on eno1
> ? (192.168.0.203) at <incomplete> on eno1
> ? (192.168.0.180) at <incomplete> on eno1
> ? (192.168.0.83) at <incomplete> on eno1
> cymbeline (192.168.0.100) at 08:62:66:4a:85:d8 [ether] on eno1
> ? (192.168.0.102) at 3c:a8:2a:f6:3a:c8 [ether] on eno1
> ? (192.168.0.16) at <incomplete> on eno1
> ? (192.168.0.227) at <incomplete> on eno1
> ? (192.168.0.11) at <incomplete> on eno1
> ? (192.168.0.239) at <incomplete> on eno1
> ? (192.168.0.28) at <incomplete> on eno1
> 
> The incomplete entries are for IP addresses I simply never have used.
> 
> Anyone recognise this behaviour?
> 
> After clearing, at least one is back...

   This could be a case of your router remembering
   where DHCP addresses USED to be. Even if you later
   set the devices to static, the old associations
   are't necessarily cleared. ARP may just be
   smelling traces of the missing devices.

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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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