No LAN connectivity with radvd sendmsg: No buffer space available

[gothbert]

Hi,

I run OPNSense 24.7.6. Last evening, IPv4 network connectivity broke. Restarting all services from the console menu did not help. A reboot was required.

This is what the General Log reveals:

Every 30 minutes, dhcp6c logs dhcp6c_script: RENEW on igb0 executing. igb0 is the WAN interface. Then, suddenly, radvd reports about 17 minutes later: sendmsg: No buffer space available. This message repeats every 5 seconds.

Pinging the LAN interface via IPv4(!) does not work. Neither can I reach any host on the LAN from OPNSense.

Only rebooting OPNSense brings operations back to normal. I had this once before with the previous version.

There are several reports of this issue in the forum but with little to no response nor solution. I am willing to contribute logs, configuration etc. to help solving the issue.

Kind regards,
Boris