WAP4410N firmware upgrade from 22.214.171.124-K9 to 126.96.36.199 breaks ARP
I found that upgrading the firmware of a WAP4410N from 188.8.131.52-K9 to 184.108.40.206 prevents many ARP packets for devices attached to the WAP from being delivered, and hence replied to, causing occasional network hangs for wireless devices. I have confirmed this using tcpdump from several devices. Only 1% of ARP packets make it to the wireless network. Reverting to firmware 220.127.116.11-K9 fixed the problem and 100% of ARP packets appear, and hangs have stopped..
What was happening is that the IPMI card was repeatedly asking for its own IP address (even though it had a fixed IP address), and no one was replying. It feels like at some point the WAP decided to stop listening to ARP entries, and connections to certain hosts had no idea what the ethernet MAC address was.
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