WAN PPPoE IPv6 default route set to wrong interface

[Taomyn]

After many years my ISP has finally sorted IPv6 for my connection (over PPPoE IPv4) but it seems OPNsense is not setting the default route correctly i.e. uses vtnet0_vlan100 instead of pppoe0, and thus traffic fails to leave my firewall.

The gateway is scoped to the parent VLAN but the output interface is a different VLAN:

default  fe80::be24:11ff:fe78:54d5%vtnet0_vlan100  UG  vtnet0_vlan1

Should be:

default  fe80::be24:11ff:fe78:54d5%pppoe0  UG  pppoe0

Impact: LAN clients get SLAAC addresses and default routes from radvd but packets are dropped at the firewall ("No route" ICMPv6).

Workaround:

route -6 delete default
route -6 add default fe80::be24:11ff:fe78:54d5%pppoe0

• UI reload of WAN does NOT fix it (re-triggers the bad route even when removed using the workaround)
• net.inet6.ip6.forwarding is 1
• radvd config is correct, RAs are being sent
• IPv4 over the same PPPoE link works fine

Possibly related: https://github.com/opnsense/core/issues/2186 but was closed due to inactivity

For now I can utilise a cron job to fix it, but is there another way I'm missing?

[franco]

Hi!

What is in:

# ifctl -6r -i pppoe0

And which version are you using?


Cheers,
Franco

[Taomyn]

Hi!

What is in:

# ifctl -6r -i pppoe0

And which version are you using?


Cheers,
Franco

It shows

ifctl -6r -i pppoe0
fe80::b614:89ff:fe08:5d00

I'm on 26.7.8_1-amd64

[franco]

That's strange. The default route should come from that file.


Cheers,
Franco