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Title: "arp: packet with unknown hardware format"
Post by: bob9744 on March 08, 2023, 02:22:39 AM

Hi all!

Upgraded to 23.1.2 earlier today, and I just noticed this via dmesg (never seen it before):

Quote
arp: packet with unknown hardware format 0x06 received on vlan01
arp: packet with unknown hardware format 0x06 received on vlan01

Any idea what might be causing this? I really didn't find any posts with the exact same verbiage, so I've no idea what's going on.

Thanks!

Title: Re: "arp: packet with unknown hardware format"
Post by: bartjsmit on March 08, 2023, 10:05:43 AM

Something outside the firewall on vlan01. Do a (promiscuous) packet capture on the relevant interface or subnet and 'go deep' with WireShark https://www.wireshark.org/ :)

Title: Re: "arp: packet with unknown hardware format"
Post by: bob9744 on March 08, 2023, 04:26:10 PM

Thanks for the reply! I did upgrade the firmware on one of my switches yesterday, and noticed as well that the switch my PC's tied in to showed a few bad packets from my PC - perhaps it was a temporary glitch in the matrix...

Title: Re: "arp: packet with unknown hardware format"
Post by: carstenp on February 11, 2024, 06:55:20 PM

Did you ever figure out what was causing this log entry? I am seeing the same on my firewall.

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Archive => 23.1 Legacy Series => Topic started by: bob9744 on March 08, 2023, 02:22:39 AM