Date: Sun, 01 Oct 2006 12:33:50 +0900 From: Motoyuki Konno <motoyuki@bsdclub.org> To: Stefan `Sec` Zehl <sec@42.org> Cc: freebsd-net@freebsd.org Subject: Re: ipv6 and magically vanishing routes via gif0 Message-ID: <200610010333.k913XoCt087276@mail.mk.bsdclub.org> References: <20061001004527.GA8387@ice.42.org>
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Hi, I had the same problem on my FreeBSD 6-STABLE box. Fix was already committed to -current (src/sys/netinet6/nd6.c rev 1.69), but not yet to 6-STABLE. Try src/sys/netinet6/nd6.c rev 1.48.2.13 (older version) instead of 1.48.2.14. -- motoyuki Stefan `Sec` Zehl <sec@42.org> wrote: > Hi, > > I just upgraded from FreeBSD-5 to -6, and now my default route via gif0 > vanishes after 7 seconds. > > | ice:~#ifconfig gif0 > | gif0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1280 > | tunnel inet 194.77.85.2 --> 193.149.44.208 > | inet6 fe80::20e:a6ff:fe04:ea37%gif0 prefixlen 64 scopeid 0x14 > | inet6 2001:608:9::1 prefixlen 128 > | > | ice:~#route add -inet6 default -interface gif0 > | add net default: gateway gif0 [snip] > In fact, any route '-interface gif0' will vanish 7 seconds after the > first packet via that link. > > After some wild guesses, I found out, that ndp seems to be the culprit > here. -- If I disable ndp on gif0 with > > | ice:~#ndp -i gif0 -- -nud > | linkmtu=0, maxmtu=1280, curhlim=64, basereachable=30s0ms, reachable=18s, re trans=1s0ms > | Flags: accept_rtadv > > Then the routing table stays as it should. > > The question is, am I missing something here? Can anybody reproduce that > problem? > > It seems wrong that the kernel would delete static routes without even a > single log message. Furthermore I find it kind of strange that there is > neighbour discovery happening at all on an tunnel interface.
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