Re: epair/vbridge: no IPv6 traffic egress until first IPv6 packet flows in

From: Kristof Provost <kp_at_FreeBSD.org>
Date: Wed, 11 Oct 2023 11:23:49 UTC 
On 10 Oct 2023, at 19:26, FreeBSD User wrote:
> Hello,
>
> at first: observation is below, marked [OBSERVATION].
>
> Running recent CURRENT (FreeBSD 15.0-CURRENT #26 main-n265831-3523f0677ef: Mon Oct  9 14:00:42
> CEST 2023 amd64), I've configured a bridge (bridge0), the hosts's interface igb0 (I350-T2 two
> port Gigabit Network Connection ) is member of that bridge and so a couple of epair(4) devices
> belonging to a couple of jails.
>
<snip>
> On epairs as well as on the main hosts igb0 NIC, both IPv4 and IPv6 are configured, IPv6 uses
> ULA and setup doesn't has anything fancy.
>
Do not assign addresses to bridge member interfaces. Assign the addresses to the bridge itself.
Misconfiguring that breaks multicast, which almost certainly explains all of your symptoms.

Best regards,
Kristof