Date: Mon, 15 Sep 2025 15:05:02 -0400 From: Tom Pusateri <pusateri@keehole.org> To: Chris Ross <cross+freebsd@distal.com> Cc: Karl Denninger <karl@denninger.net>, freebsd-net@freebsd.org Subject: Re: IPv6 networking problems in 14.3 Message-ID: <D085097D-A36A-4942-AAB3-A7080AB33239@keehole.org> In-Reply-To: <74D374DA-09B8-4533-B2EE-1AFE2AC8EFAD@distal.com> References: <4C00D174-21FE-47C4-A30A-A382138571A5@keehole.org> <A9EBD993-D77D-49F9-9FFB-0E42EA0BEE6E@keehole.org> <DC84D8EC-B084-4AF1-B3F4-413323DA613A@distal.com> <dfa7af0c-334f-4b36-86dc-b2d75d1477d3@denninger.net> <E06E4F40-0E2C-4C4E-9C27-3BCF086347FA@distal.com> <6fce77fb-9ba8-4c7b-bb9b-0e337d91f278@denninger.net> <1780EFAC-DA9C-4593-BE37-28E7FFCE4388@distal.com> <6e7a8fc6-12c8-4097-ad70-bcb1e4967ade@denninger.net> <74D374DA-09B8-4533-B2EE-1AFE2AC8EFAD@distal.com>
next in thread | previous in thread | raw e-mail | index | archive | help
I would try running the 14.3p2 system without the VLAN configuration and a direct connection to the upstream provider hardware (no switch) and see if the problem persists. That will determine if it’s a VLAN issue. Tom > On Sep 15, 2025, at 2:20 PM, Chris Ross <cross+freebsd@distal.com> wrote: > > Okay. Apologies to those who like the whole thread to be in each email, but > I’m starting again here after a discovery. > > I rebooted my router after copying the 14.1p5 kernel I was running earlier, > and while the system failed to come up very well (due to 14.3 userland), I > was able to manually start up dhcpcd, the same actual binary, and it was > able to set up my IPv6 connectivity through my ISP just like before. So > there’s a regression here. Or something subtle I need to change that I > am so far missing. > > Summary: > When booted with FreeBSD 14.3-RELEASE-p2, dhcpcd gets an RA from my ISP, > sends a NS, but never gets the NA response. Therefore no outgoing packets > ever get out. > > % ndp -an | grep vlan0 > fe80::3e8a:b0ff:fe3e:4dce%vlan0 (incomplete) vlan0 1s I > fe80::6e8:e675:f359:3465%vlan0 a4:53:0e:79:b9:82 vlan0 permanent R > % tail /var/log/dhcpcd.log > Sep 15 14:03:14 [10047]: vlan0: soliciting an IPv6 router > Sep 15 14:03:14 [10047]: vlan0: sending Router Solicitation > Sep 15 14:03:14 [10047]: vlan0: Router Advertisement from fe80::3e8a:b0ff:fe3e:4dce > Sep 15 14:03:14 [10047]: vlan0: executing: /usr/local/libexec/dhcpcd-run-hooks ROUTERADVERT > Sep 15 14:03:17 [10047]: vlan0: fe80::3e8a:b0ff:fe3e:4dce is unreachable > [...] > > When booting with 14.1-RELEASE-p5, dhcpcd works as expected: > > % cat 14.1-ndp-success > fe80::3e8a:b0ff:fe3e:4dce%vlan0 3c:8a:b0:3e:4d:ce vlan0 29s R R > fe80::a653:eff:fe79:b982%vlan0 a4:53:0e:79:b9:82 vlan0 permanent R > % (lines from dhcpcd.log) > Sep 15 13:50:44 [57415]: vlan0: soliciting an IPv6 router > Sep 15 13:50:44 [57415]: vlan0: sending Router Solicitation > Sep 15 13:50:44 [57415]: vlan0: Router Advertisement from fe80::3e8a:b0ff:fe3e:4dce > Sep 15 13:50:44 [57415]: vlan0: no global addresses for default route > Sep 15 13:50:44 [57415]: vlan0: executing: /usr/local/libexec/dhcpcd-run-hooks ROUTERADVERT > Sep 15 13:50:45 [57415]: vlan0: multicasting REBIND6 (xid 0x142ec7), next in 1.1 seconds > Sep 15 13:50:45 [57415]: vlan0: REPLY6 received from fe80::3e8a:b0ff:fe3e:4dce > Sep 15 13:50:45 [57415]: vlan0: renew in 3600, rebind in 5760, expire in 7200 seconds > Sep 15 13:50:45 [57415]: vlan0: writing lease: /var/db/dhcpcd/vlan0.lease6 > Sep 15 13:50:45 [57415]: vlan0: delegated prefix 2600:4040:2c9d:5200::/56 > [...] > Sep 15 13:50:45 [57415]: vlan0: adding default route via fe80::3e8a:b0ff:fe3e:4dce > [...] > Sep 15 13:50:45 [57415]: vlan0: executing: /usr/local/libexec/dhcpcd-run-hooks REBIND6 > Sep 15 13:50:45 [56455]: forked to background > [...] > > So. What other information can I help gather? I might be able to run tcpdump > when I’m up in 14.1 kernel, though the system is kinda broken in a number of > ways. Let me know anything else I can gather to help track this regression. > > -Chris >
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?D085097D-A36A-4942-AAB3-A7080AB33239>