Date: Sat, 20 Sep 2025 10:39:43 -0400 From: Chris Ross <cross+freebsd@distal.com> To: freebsd-net@freebsd.org Subject: Re: IPv6 networking problems in 14.3 Message-ID: <A0767377-BFDE-4885-91C0-A0879A8400E5@distal.com> In-Reply-To: <1BF72AB3-69B6-4BC6-BA5B-6517BD35E41D@distal.com> References: <910737314.4002.1757962919189@localhost> <55365E3D-B7EA-4F95-BC1E-92910A2944EA@distal.com> <90A490DE-6BF0-4EBB-97CE-ECA690E2359C@distal.com> <5D82826E-8C0F-45CF-B9FF-093FD014E73F@distal.com> <611820c2-05f8-40bc-9b07-bef012183e30@denninger.net> <408DE851-47FF-476E-B7F6-C7920A93DD43@distal.com> <1BF72AB3-69B6-4BC6-BA5B-6517BD35E41D@distal.com>
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> On Sep 18, 2025, at 16:36, Chris Ross <cross+freebsd@distal.com> =
wrote:
>=20
>> On 17 Sep 2025, at 14:20, Chris Ross <cross+freebsd@distal.com> =
wrote:
>> So, on the idea of trying to back-date the whole machine, I have ZFS
>> snapshots of the whole root from just before the first upgrade,
>> Aug 7/8. [=E2=80=A6]
>=20
> [...] I=E2=80=99ve set bootfs to the older 14.1 system and gotten =
that running.
>=20
> It [...] out SOLICIT6 messages and [..] if I waited long enough (2ish
> hours in my case), it eventually did get an answer!
And, this is where things went odd again. The above attempt in older
filesystem, I had during boot menu chosen my ROUTER custom kernel. Just
a config I traditionally use that has fewer devices in it occupying =
memory.
So, thinking it shouldn=E2=80=99t make a difference I rebooted into the =
default,
GENERIC, kernel on the system. The default kernel had problems [1], so =
I
chose the boot/kernel.generic on the fs.
Sadly, it did not work. I get the same state where the router LL is
unroutable, ndp -an shows no MAC for it, and I have no IPv6. So,
despite thinking the kernel config wasn=E2=80=99t key detail, I booted =
back
into kernel.router. Now I have no IPv6 there either. I tried just
shutting down dhcpcd overnight to see if it ISP was confused, but no =
help.
So, it certainly could be the ISP, but the fact that I=E2=80=99m getting =
RA=E2=80=99s
(and dhcp6 responses) which dhcpcd is processing, but then the MAC for
the routers LL isn=E2=80=99t available to the system, makes me think =
it=E2=80=99s _not_
the ISP. I can=E2=80=99t imagine why a working rootfs and kernel could
show a system level problem intermittently, though.
Thoughts again invited. Not able to reproduce success now, I don=E2=80=99=
t
know that I can actually _test_ anything, but I=E2=80=99d love to hear =
thoughts
about any options/possibilities.
- Chris
[1] Sadly there is something wrong with /boot/kernel in that fs. When
I boot it I get a number of:
KLD uhid.ko: depends on kernel - not available or version mismatch
KLD ums.ko: depends on kernel - not available or version mismatch
KLD usbhid.ko: depends on kernel - not available or version mismatch
KLD uhid.ko: depends on kernel - not available or version mismatch
errors late in boot. That kernel is 14.1-RELEASE-p7 (despite the fs
freebsd-update made named =
zroot/ROOT/14.1-RELEASE-p8_2025-08-08_074410).
The rest of the kernels I have on the fs are 14.1p5. something must be
off with that one. So I booted /boot/kernel.generic, 14.1p5, and it
boots fine.
Current output log of dhcpcd: note "fe80::3e8a:b0ff:fe3e:4dce is =
unreachable=E2=80=9D.
That=E2=80=99s a kernel routing issue, and I think the primary problem.
Sep 20 10:20:32 [30273]: vlan0: REPLY6 received from =
fe80::3e8a:b0ff:fe3e:4dce
Sep 20 10:20:32 [30273]: vlan0: renew in 3600, rebind in 5760, expire in =
7200 seconds
Sep 20 10:20:32 [30273]: lo0: adding reject route to =
2600:4040:2c9c:2d00::/56 via ::1
Sep 20 10:20:32 [30273]: vlan0: writing lease: =
/var/db/dhcpcd/vlan0.lease6
Sep 20 10:20:32 [30273]: vlan0: delegated prefix =
2600:4040:2c9c:2d00::/56
Sep 20 10:20:32 [30273]: vlan0: executing: =
/usr/local/libexec/dhcpcd-run-hooks BOUND6
Sep 20 10:29:08 [30273]: vlan0: Router Advertisement from =
fe80::3e8a:b0ff:fe3e:4dce
Sep 20 10:29:08 [30273]: vlan0: no global addresses for default route
Sep 20 10:29:08 [30273]: vlan0: executing: =
/usr/local/libexec/dhcpcd-run-hooks ROUTERADVERT
Sep 20 10:30:15 [30273]: vlan0: fe80::3e8a:b0ff:fe3e:4dce is unreachable
Sep 20 10:30:15 [30273]: vlan0: delaying IPv6 router solicitation for =
0.7 seconds
Sep 20 10:30:16 [30273]: vlan0: soliciting an IPv6 router
Sep 20 10:30:16 [30273]: vlan0: sending Router Solicitation
Sep 20 10:30:16 [30273]: vlan0: Router Advertisement from =
fe80::3e8a:b0ff:fe3e:4dce
Sep 20 10:30:16 [30273]: vlan0: executing: =
/usr/local/libexec/dhcpcd-run-hooks ROUTERADVERT
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