Re: IPv6 networking problems in 14.3

Sending a copy of the relevant portions of /etc/rc.conf, the output of “ifconfig”, and “netstat -nra”, and the dhcpcd config file would be helpful to determine next steps.

Tom

> On Sep 13, 2025, at 4:49 PM, Chris Ross <cross+freebsd@distal.com> wrote:
> 
> Hello all.  My primary home router is a FreeBSD 14 system, with an outside connection to Verizon, through a direct connection to the ONT.  (ie, no Verizon router/bridge involved).  I did a bunch of work last year, running 14.1, to get IPv6 working with what they provided, and it was all working alright until I upgraded the system for 14.3 a month or so ago.  I noticed some problem immediately with dhcpcd’s logging, which I assumed was from running an older version I built myself, and I switched to the one in ports which seemed okay (to my eyes, but I fear I may not actually have tested it).
> 
> Tl;dr; I am not able to get IPv6 traffic in and out of my house through Verizon.  I reached out to Roy Marples, who had helped me get this all set up using dhcpcd a year ago.  But, after looking for a bit, I think it’s not dhcpcd that is the problem.
> 
> Dhcpcd sends a router solicitation (RS) out and immediately gets an RA back, including the delegated IPv6 network I am expecting.  Then, it sends a neighbor solicitation (NS) and never gets an answer.  A few seconds later dhcpcd reports "vlan0: fe80::3e8a:b0ff:fe3e:4dce is unreachable” and begins the router solicitation process over.  This happens every few seconds.  I’ve assigned the delegated networks internally, but nothing works since I can’t send any traffic out.
> 
> The RA is coming from "fe80::3e8a:b0ff:fe3e:4dce” on vlan0, but there is never a routable address:
> 
> % ndp -an | grep 'fe80::3e8a:b0ff:fe3e:4dce'
> fe80::3e8a:b0ff:fe3e:4dce%vlan0      (incomplete)       vlan0 expired   I
> 
> The NS I’m sending is to ff02::1:ff3e:4dce, but I’m never getting an answer.  It looks like I’m never getting any NAs.  I’ve tried turning on effectively “allow all icmpv6” in my pf.conf, and still seeing this.  And the pf.conf hadn’t changed since it was working in 14.1 a couple months ago.
> 
> Just looking for next steps now.  Interfaces are all vlan interfaces on an ix device running at 1gb/s.  Is there any known issue in 14.3-RELEASE-p1 ?
> 
> Thank you.
> 
> - Chris
>