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[77.32.84.83]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-436e9e03f8bsm16124295e9.23.2025.01.09.02.31.07 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 09 Jan 2025 02:31:07 -0800 (PST) Message-ID: <74e4f2ce-5629-4816-93ee-f8b3ed3891e2@gmail.com> Date: Thu, 9 Jan 2025 11:31:06 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Content-Language: en-US To: b.a.t.m.a.n@lists.open-mesh.org From: Matteo Fortini Subject: Multiple ARP replies for same address on openwrt module 6.6.69.2024.3-r3 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Message-ID-Hash: JIBNLB27ZONYITKFGQL3XA4X2GC4S5NP X-Message-ID-Hash: JIBNLB27ZONYITKFGQL3XA4X2GC4S5NP X-MailFrom: matteo.fortini@gmail.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-b.a.t.m.a.n.lists.open-mesh.org-0; header-match-b.a.t.m.a.n.lists.open-mesh.org-1; header-match-b.a.t.m.a.n.lists.open-mesh.org-2; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.8 Precedence: list List-Id: The list for a Better Approach To Mobile Ad-hoc Networking Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: 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.