radvd | prefix length should be 64 for ix0

[fakebizprez]

Code: [Select]

+---------------------------+----------+---------+--------------------------------+
| Time                      | Severity | Process | Message                        |
+---------------------------+----------+---------+--------------------------------+
| 2024-11-30T08:13:55-06:00| Warning  | radvd   | prefix length should be 64 for ix0 |
| 2024-11-30T08:10:31-06:00| Warning  | radvd   | prefix length should be 64 for ix0 |
| 2024-11-30T08:09:52-06:00| Warning  | radvd   | prefix length should be 64 for ix0 |
| 2024-11-30T08:05:14-06:00| Warning  | radvd   | prefix length should be 64 for ix0 |
| 2024-11-30T08:03:08-06:00| Warning  | radvd   | prefix length should be 64 for ix0 |
+---------------------------+----------+---------+--------------------------------+

Live Logs…this came out of nowhere, I haven't messed with a config or touched a machine in a few days.
WAN is set to DHCP, LAN is set to Track WAN interface. Always has been like that.  ISP issue?

[Patrick M. Hausen]

Is ix0 WAN or LAN? What prefix length is configured?

[fakebizprez]

My apologies, Patrick. ix0 is for LAN, ix1 is for WAN, and there is another interface for the Wireguard plugin.

I believe I know what caused this. Somehow in the DHCP4 settings, my subnet route changed to end at .240 instead of .254.

Despite me remedying that in the GUI and going into the terminal to reconfigure the interface and subnet, my prefix length is still /60. My WAN IPv6 is 128 and, for what it's worth, they have completely different IPv6 addresses (not sure if that's out of the ordinary).

[Patrick M. Hausen]

You have prefix length /60 configured on LAN? That's not correct. All interfaces must be /64 or /128.

[meyergru]

Your IPv4 prefix length has nothing to do with IPv6.

It is perfectly fine that the WAN (IA-NA) and other prefixes (IA-PD) prefixes differ. Usually, IA-NA is one /128 IPv6 and IA-PD is /56 - or at least something bigger than /64.

One /64 subnet out of the IA-PD prefix is what you need for SLAAC / RADVD to work for any (V)LAN, therefore the warning. IDK how you got a /60 there. If you just configure your (V)LAN to "track interface" and choose a prefix ID (which will control which of the available prefixes your LAN will get), you should get one specific /64 IA-PD prefix and 64 bits available for EUI-64 via SLAAC.

Maybe you have a static prefix and configured something else than "track interface"? If you configure it manually, you will have to use /64.