OPNsense Forum

Archive => 20.7 Legacy Series => Topic started by: Greelan on December 09, 2020, 08:53:23 am

Title: [SOLVED] dhcp6c - failed to add an address on igb1: File exists
Post by: Greelan on December 09, 2020, 08:53:23 am

Hopefully sometime can give me a tip to fix a little problem I have with IPv6.

Up until yesterday, I had IPv6 configured properly in OPNsense. My various VLANs were getting /64 networks, and all was good.

My ISP developed some IPv6 routing issues yesterday due to some router config changes at their end, and while they were fixing it I turned off IPv6 on the WAN interface (didn't touch the VLANs though).

Today I turned it back on. However, my VLANs are no longer getting /64s.

The WAN is happily getting an /128 address and /56 prefix. But dhcp6c says in the logs for each VLAN, for example: "failed to add an address on igb1: File exists".

Reloading IPv6 on the WAN does not fix it. Nor does restarting radvd. Nor does rebooting OPNsense.

Anyone got any tips for fixing this easily? Thanks.

Title: Re: dhcp6c - failed to add an address on igb1: File exists
Post by: Greelan on December 09, 2020, 01:09:06 pm

Nevermind, it was my own stupidity - when I turned IPv6 back on for the WAN, the settings defaulted to a /64 prefix, rather than the /56 that my ISP provides. So OPNsense thought it had nothing to hand out to the VLANs. Fixed now! ::)