From: Matteo Fortini <matteo.fortini@gmail.com>
To: b.a.t.m.a.n@lists.open-mesh.org
Subject: Multiple ARP replies for same address on openwrt module 6.6.69.2024.3-r3
Date: Thu, 9 Jan 2025 11:31:06 +0100 [thread overview]
Message-ID: <74e4f2ce-5629-4816-93ee-f8b3ed3891e2@gmail.com> (raw)
I am noticing random unreachability of hosts in my network, in
particular if I just nmap -sP the whole range.
I traced it down to ARP poisoning, and the source seems to be two hosts
running batman-adv which are claiming the same address.
This is a sample output from arping
ARPING 192.168.99.1
42 bytes from 02:00:01:bb:00:07 (192.168.99.1): index=0 time=4.204 msec
56 bytes from 02:00:06:bb:00:07 (192.168.99.1): index=1 time=363.556 msec
42 bytes from 02:00:01:bb:00:07 (192.168.99.1): index=2 time=3.743 msec
56 bytes from 02:00:06:bb:00:07 (192.168.99.1): index=3 time=385.352 msec
issue is, 02:00:06:bb:00:07 is not the right node and the host is
unreachable. The other MAC is the right one.
If I clear the ARP cache in my source host, then the remote host is
reachable again as it gets the right answer.
The problem started after updating to the 24.10RC series of openwrt.
next reply other threads:[~2025-01-09 10:31 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-01-09 10:31 Matteo Fortini [this message]
2025-01-09 10:55 ` Multiple ARP replies for same address on openwrt module 6.6.69.2024.3-r3 Sven Eckelmann
2025-01-09 11:32 ` Matteo Fortini
2025-01-09 12:47 ` [SOLVED] " Matteo Fortini
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