Date: Tue, 5 Sep 2017 13:51:32 +0300 From: "Andrey V. Elsukov" <bu7cher@yandex.ru> To: Greg Rivers <gcr+freebsd-stable@tharned.org>, freebsd-stable@freebsd.org Subject: Re: SLAAC not working Message-ID: <37bf1f27-0cdd-b5a9-7345-d16eb228c4cb@yandex.ru> In-Reply-To: <16545541.lkKC6IFVDn@flake.tharned.org> References: <1646645.UkMcyRZBVl@flake.tharned.org> <3078071.oYt2PD7K2Q@flake.tharned.org> <ce430a71-06da-1a83-f5b4-f9bfbc75afd7@yandex.ru> <16545541.lkKC6IFVDn@flake.tharned.org>
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From: "Andrey V. Elsukov" <bu7cher@yandex.ru>
To: Greg Rivers <gcr+freebsd-stable@tharned.org>, freebsd-stable@freebsd.org
Message-ID: <37bf1f27-0cdd-b5a9-7345-d16eb228c4cb@yandex.ru>
Subject: Re: SLAAC not working
References: <1646645.UkMcyRZBVl@flake.tharned.org>
<3078071.oYt2PD7K2Q@flake.tharned.org>
<ce430a71-06da-1a83-f5b4-f9bfbc75afd7@yandex.ru>
<16545541.lkKC6IFVDn@flake.tharned.org>
In-Reply-To: <16545541.lkKC6IFVDn@flake.tharned.org>
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On 05.09.2017 00:20, Greg Rivers wrote:
> Thanks. Trying your same experiment, I do get output for duplicate dete=
ction, though it doesn't include the interface identifier or a check for =
the auto generated link-local address (maybe you're running -CURRENT?):
Yes, it is CURRENT, but auto generated address is there because lagg0
did not have enabled IPv6 at beginning of test.
> # ifconfig lagg0 inet6 fe80::8/64
> # ifconfig lagg0 inet6 fe80::8/64 delete
> # dmesg | tail -2
> lagg0: starting DAD for fe80:c::8
> lagg0: DAD complete for fe80:c::8 - no duplicates found
>=20
> What puzzles me is that there are two Cisco routers on this network tha=
t each send RAs every ~10 minutes, yet nothing is ever logged on the host=
, and the RAs, which should trigger address auto-configuration, are compl=
etely ignored.
You can try to use dtrace to detect that RA is received by IPv6 stack.
# kldload dtraceall
# dtrace -n 'fbt::nd6_ra_input:entry {m =3D (struct mbuf *)arg0; ip6 =3D=
(struct ip6_hdr *)m->m_data; printf("RA from %s received on %s",
inet_ntoa6(&ip6->ip6_src), stringof(m->m_pkthdr.rcvif->if_xname));}'
It should produce the output like this:
dtrace: description 'fbt::nd6_ra_input:entry ' matched 1 probe
CPU ID FUNCTION:NAME
2 37912 nd6_ra_input:entry RA from
fe80:1::92e2:baff:fe6a:c7c received on ix0
2 37912 nd6_ra_input:entry RA from
fe80:1::92e2:baff:fe6a:c7c received on ix0
> $ ping6 fe80:XXXX:XXXX:4013:23::2%lagg0
> ping6: UDP connect: Network is unreachable
Hmm. Can you show the second word of address in this example?
Is it not zero? I.e. fe80:XXXX: is correct or you missed '::' part?
--=20
WBR, Andrey V. Elsukov
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