Date: Sat, 30 Sep 2006 20:33:11 +0100 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: freebsd-stable@freebsd.org Subject: Disappearing IPv6 default route Message-ID: <451EC677.6000404@infracaninophile.co.uk>
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Dear list,
I've had IPv6 connectivity for some years via an IPv6 in IPv4 gif tunnel
courtesy of my ISP. However, about a week ago, when I upgraded to
6.2-PRERELEASE, I noticed it had mysteriously stopped working. (It may h=
ave
died before last week though; but that is the probable time) So this
weekend I set out to find out why.
After much head scratching, I discovered that the IPv6 default route
was not present on the system. If I added it back manually, voil=E0: IPv=
6
connectivity back again ... for a few seconds.
This is completely reproducible:
happy-idiot-talk:~:% sudo route add -inet6 default -interface gif0 ; ping=
6 clueless.aaisp.net.uk
add net default: gateway gif0
PING6(56=3D40+8+8 bytes) 2001:8b0:151:1::1 --> 2001:8b0:0:81::51bb:5115
16 bytes from 2001:8b0:0:81::51bb:5115, icmp_seq=3D0 hlim=3D61 time=3D32.=
221 ms
16 bytes from 2001:8b0:0:81::51bb:5115, icmp_seq=3D1 hlim=3D61 time=3D29.=
856 ms
16 bytes from 2001:8b0:0:81::51bb:5115, icmp_seq=3D2 hlim=3D61 time=3D29.=
560 ms
16 bytes from 2001:8b0:0:81::51bb:5115, icmp_seq=3D3 hlim=3D61 time=3D30.=
348 ms
16 bytes from 2001:8b0:0:81::51bb:5115, icmp_seq=3D4 hlim=3D61 time=3D28.=
957 ms
16 bytes from 2001:8b0:0:81::51bb:5115, icmp_seq=3D5 hlim=3D61 time=3D30.=
626 ms
16 bytes from 2001:8b0:0:81::51bb:5115, icmp_seq=3D6 hlim=3D61 time=3D29.=
384 ms
16 bytes from 2001:8b0:0:81::51bb:5115, icmp_seq=3D7 hlim=3D61 time=3D31.=
815 ms
ping6: sendmsg: No route to host
ping6: wrote clueless.aaisp.net.uk 16 chars, ret=3D-1
ping6: sendmsg: No route to host
ping6: wrote clueless.aaisp.net.uk 16 chars, ret=3D-1
ping6: sendmsg: No route to host
ping6: wrote clueless.aaisp.net.uk 16 chars, ret=3D-1
ping6: sendmsg: No route to host
ping6: wrote clueless.aaisp.net.uk 16 chars, ret=3D-1
ping6: sendmsg: No route to host
ping6: wrote clueless.aaisp.net.uk 16 chars, ret=3D-1
^C
--- clueless.aaisp.net.uk ping6 statistics ---
13 packets transmitted, 8 packets received, 38.5% packet loss
round-trip min/avg/max/std-dev =3D 28.957/30.346/32.221/1.088 ms
After 8 pings, the default route disappears. tcpdump shows no other traf=
fic
to/from the tunnel end-point than the pings and responses. I can't find =
anything
similar reported elsewhere on the 'net. Any clues gratefully received.
OS Version:
happy-idiot-talk:~:% uname -a=20
FreeBSD happy-idiot-talk.infracaninophile.co.uk 6.2-PRERELEASE FreeBSD 6.=
2-PRERELEASE #9: Fri Sep 29 01:08:43 BST 2006 root@happy-idiot-talk.i=
nfracaninophile.co.uk:/usr/obj/usr/src/sys/HAPPY-IDIOT-TALK i386
IPv6 related stuff from rc.conf:
gif_interfaces=3D"gif0"
gifconfig_gif0=3D"81.187.76.162 81.187.81.6"
ipv6_enable=3D"YES"
ipv6_defaultrouter=3D"-interface gif0"
ipv6_default_interface=3D"gif0"
ipv6_ifconfig_gif0=3D"2001:08b0:0151:0001::1 prefixlen 64"
ipv6_gateway_enable=3D"YES"
happy-idiot-talk:~:% ifconfig gif0=20
gif0: flags=3D8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1280
tunnel inet 81.187.76.162 --> 81.187.81.6
inet6 fe80::240:5ff:fea5:8db7%gif0 prefixlen 64 scopeid 0x3=20
inet6 2001:8b0:151:1::1 prefixlen 64=20
Cheers,
Matthew
--=20
Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard
Flat 3
PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate
Kent, CT11 9PW
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