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General Discussion / Corrupted ARP entry.
« on: June 29, 2023, 12:31:07 am »
Hello,
I never ask for help because I have been in IT for over forty years which means I know everything already that was a joke.
This one has me stumped. I am running the following OPNsense version(s):
Versions OPNsense 23.1.10_1-amd64
FreeBSD 13.1-RELEASE-p7
OpenSSL 1.1.1u 30 May 2023
If I flush the ARP table and allow it to repopulate, the following correct entry will be inserted into the table:
172.18.222.40 dc:a6:32:4a:6b:b5 Raspberry Pi Trading Ltd em1 lan PiHole.gopierce.com
The correct hardware address for my PiHole server is dc:a6:32:4a:6b:b5. Everything works great for hours or days. Then for some unknown reason, I find the following line in the ARP table:
172.18.222.40 dc:a6:32:4a:6b:b8 Raspberry Pi Trading Ltd em1 lan PiHole.gopierce.com
Note the ':b8' on the end of the hardware address (it should be ':b5'). That goes nowhere and I can no longer ping 172.18.222.40 from anywhere on my local networks. Flush the ARP table and can immediatley ping 172.18.222.40 again for hours or days until for some unknown reason the incorrect hardware address appears again in the ARP table.
Any one have a clue as to where or why an ARP table entry would be updated with the incorrect hardware address?
I would prefer to NOT have ARP at all over this mess, but I do not know if there is a way to turn it off.
Many thanks for any help,
Richard
I never ask for help because I have been in IT for over forty years which means I know everything already that was a joke.
This one has me stumped. I am running the following OPNsense version(s):
Versions OPNsense 23.1.10_1-amd64
FreeBSD 13.1-RELEASE-p7
OpenSSL 1.1.1u 30 May 2023
If I flush the ARP table and allow it to repopulate, the following correct entry will be inserted into the table:
172.18.222.40 dc:a6:32:4a:6b:b5 Raspberry Pi Trading Ltd em1 lan PiHole.gopierce.com
The correct hardware address for my PiHole server is dc:a6:32:4a:6b:b5. Everything works great for hours or days. Then for some unknown reason, I find the following line in the ARP table:
172.18.222.40 dc:a6:32:4a:6b:b8 Raspberry Pi Trading Ltd em1 lan PiHole.gopierce.com
Note the ':b8' on the end of the hardware address (it should be ':b5'). That goes nowhere and I can no longer ping 172.18.222.40 from anywhere on my local networks. Flush the ARP table and can immediatley ping 172.18.222.40 again for hours or days until for some unknown reason the incorrect hardware address appears again in the ARP table.
Any one have a clue as to where or why an ARP table entry would be updated with the incorrect hardware address?
I would prefer to NOT have ARP at all over this mess, but I do not know if there is a way to turn it off.
Many thanks for any help,
Richard