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 have 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, voilà: IPv6
connectivity back again ... for a few seconds.
This is completely reproducible:
happy-idiot-talk:~:% sudo route add -inet6 default -interface gif0 ; ping6
clueless.aaisp.net.uk
add net default: gateway gif0
PING6(56=40+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=0 hlim=61 time=32.221 ms
16 bytes from 2001:8b0:0:81::51bb:5115, icmp_seq=1 hlim=61 time=29.856 ms
16 bytes from 2001:8b0:0:81::51bb:5115, icmp_seq=2 hlim=61 time=29.560 ms
16 bytes from 2001:8b0:0:81::51bb:5115, icmp_seq=3 hlim=61 time=30.348 ms
16 bytes from 2001:8b0:0:81::51bb:5115, icmp_seq=4 hlim=61 time=28.957 ms
16 bytes from 2001:8b0:0:81::51bb:5115, icmp_seq=5 hlim=61 time=30.626 ms
16 bytes from 2001:8b0:0:81::51bb:5115, icmp_seq=6 hlim=61 time=29.384 ms
16 bytes from 2001:8b0:0:81::51bb:5115, icmp_seq=7 hlim=61 time=31.815 ms
ping6: sendmsg: No route to host
ping6: wrote clueless.aaisp.net.uk 16 chars, ret=-1
ping6: sendmsg: No route to host
ping6: wrote clueless.aaisp.net.uk 16 chars, ret=-1
ping6: sendmsg: No route to host
ping6: wrote clueless.aaisp.net.uk 16 chars, ret=-1
ping6: sendmsg: No route to host
ping6: wrote clueless.aaisp.net.uk 16 chars, ret=-1
ping6: sendmsg: No route to host
ping6: wrote clueless.aaisp.net.uk 16 chars, ret=-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 = 28.957/30.346/32.221/1.088 ms
After 8 pings, the default route disappears. tcpdump shows no other traffic
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
FreeBSD happy-idiot-talk.infracaninophile.co.uk 6.2-PRERELEASE FreeBSD
6.2-PRERELEASE #9: Fri Sep 29 01:08:43 BST 2006 [EMAIL
PROTECTED]:/usr/obj/usr/src/sys/HAPPY-IDIOT-TALK i386
IPv6 related stuff from rc.conf:
gif_interfaces="gif0"
gifconfig_gif0="81.187.76.162 81.187.81.6"
ipv6_enable="YES"
ipv6_defaultrouter="-interface gif0"
ipv6_default_interface="gif0"
ipv6_ifconfig_gif0="2001:08b0:0151:0001::1 prefixlen 64"
ipv6_gateway_enable="YES"
happy-idiot-talk:~:% ifconfig gif0
gif0: flags=8051<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
inet6 2001:8b0:151:1::1 prefixlen 64
Cheers,
Matthew
--
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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