(usagi-users 01938) Delegated aggregatable subnet from Dual stack ISP- gateway unreachable

[Hans Rakers <hans@xxxxxxxx>]

Hello all,


Last few days i've been struggling with the following problem. Our ISP 
has given us a 2001:xxx:1290::/48 aggregatable IPv6 range to offer our 
services on IPv6 . Their network is fully dual stack.

I have two test boxes running Linux 2.4.19 with USAGI kernel patch.

First box configured as follows:

ifconfig eth0 add 2001:xxx:1290::2/64
route -A inet add default gw 2001:xxx:1290::1 dev eth0

ip -6 route output:

2001:xxx:1290::/64 dev eth0  proto kernel  metric 256  mtu 1500 advmss 1440
fe80::/64 dev eth1  proto kernel  metric 256  mtu 1500 advmss 1440
fe80::/64 dev eth0  proto kernel  metric 256  mtu 1500 advmss 1440
ff00::/8 dev eth1  proto kernel  metric 256  mtu 1500 advmss 1440
ff00::/8 dev eth0  proto kernel  metric 256  mtu 1500 advmss 1440
default dev eth0  proto kernel  metric 256  mtu 1500 advmss 1440
default via 2001:xxx:1290::1 dev eth0  metric 1024  mtu 1500 advmss 1440
unreachable default dev lo  metric -1  error -101

root@osiris:~# cat /proc/net/inet6_version
usagi-stable-4, 20021007


Second box configured as follows:

ifconfig eth0 add 2001:xxx:1290::3/64
route -A inet add default gw 2001:xxx:1290::1 dev eth0

ip -6 route output:

2001:xxx:1290::/64 dev eth0  proto kernel  metric 256  mtu 1500 advmss 1440
fe80::/64 dev eth0  proto kernel  metric 256  mtu 1500 advmss 1440
fe80::/64 dev eth1  proto kernel  metric 256  mtu 1500 advmss 1440
ff00::/8 dev eth0  proto kernel  metric 256  mtu 1500 advmss 1440
ff00::/8 dev eth1  proto kernel  metric 256  mtu 1500 advmss 1440
default via 2001:xxx:1290::1 dev eth0  metric 1024  mtu 1500 advmss 1440
unreachable default dev lo  metric -1  error -101

root@phobos:~# cat /proc/net/inet6_version
usagi-stable-4, 20021007

Both boxes can ping6 eachother on their link-local aswell as global 
address, but when i try to ping6 the gateway 2001:xxx:1290::1 on either 
box i get this:

root@phobos:~# ping6 2001:xxx:1290::1
PING 2001:xxx:1290::1(2001:xxx:1290::1) 56 data bytes
From 2001:xxx:1290::3 icmp_seq=1 Destination unreachable: Address 
unreachable
From 2001:xxx:1290::3 icmp_seq=2 Destination unreachable: Address 
unreachable
From 2001:xxx:1290::3 icmp_seq=3 Destination unreachable: Address 
unreachable

tcpdump on the other box gives this output:

root@osiris:~# tcpdump -vvv -s 512 ip6
tcpdump: listening on eth0
13:08:58.229917 2001:xxx:1290::3 > ff02::1:ff00:1: icmp6: neighbor sol: 
who has 2001:xxx:1290::1(src lladdr: 00:01:02:1f:e9:4f) (len 32, hlim 255)
13:08:59.229939 2001:xxx:1290::3 > ff02::1:ff00:1: icmp6: neighbor sol: 
who has 2001:xxx:1290::1(src lladdr: 00:01:02:1f:e9:4f) (len 32, hlim 255)
13:09:00.229971 2001:xxx:1290::3 > ff02::1:ff00:1: icmp6: neighbor sol: 
who has 2001:xxx:1290::1(src lladdr: 00:01:02:1f:e9:4f) (len 32, hlim 255)

2001:xxx:1290::1 is the gateway provided by our ISP and up on one of 
their routers. It seems the boxes are deperately trying to get a hold of 
2001:xxx:1290::1 with no luck. I dont see any router advertisements from 
2001:xxx:1290::1 on the eth0 interface. I've had contact with our ISP 
and they say everything is ok on their end.

Both boxes are on a 3Com 3300XM switch, which has a uplink to our ISP's 
extremenetworks switch.

Any help will be greatly appreciated!

If more information on the setup is needed i'd be happy to provide 
whatever is necessary.

Kind regards,

Hans Rakers
Parse BV
the Netherlands