(usagi-users 02431) [Fwd: IPv6 bugs introduced in 2.4.21]

[Andre Tomt <andre@xxxxxxxx>]

I figured I would forward my own message here - since it's you guys who
fix ipv6 issues in mainstream nowadays ;-)

-----Forwarded Message-----

> From: Andre Tomt <andre@xxxxxxxxxxx>
> To: netdev@xxxxxxxxxxx
> Subject: IPv6 bugs introduced in 2.4.21
> Date: 16 Jun 2003 21:50:48 +0200
> 
> [PS, I'm not subscribed to netdev, CC would be nice - is there any way
> to get subscribed?]
> 
> Hi
> 
> I mailed you guys a little while ago on the "unable to use
> SOMENETWORK::0000 as a nexthop gateway" bug in 2.4.21-pre/rc a while
> ago. It is still present in 2.4.21, rendering the "first" /128 of a
> arbitrary prefixlen unusable - :0000. This is especially bad with /127
> tunnels, rendering :0000 and :0001 unusable). But! There is one more
> oddity in 2.4.21, not present in 2.4.20..
> 
> The lower part of a /127 network is somehow, strangely routed to lo -
> observe..
> 
> * ed-gw1 configuration
> running 2.4.21-s2 (internal vendor tree with megaraid, md and some
> netdrv updates, but pristine behaves the same)
> 
> * relevant routing info
> 2001:730:3::1:2a/127 via :: dev aorta  proto kernel  metric 256  mtu 1480 advmss 1420
> 
> 2a is Aorta's end of the /127, 2b is our end.
> 
> 
> from a host behind some routers:
> 
> root@kvass ~ # traceroute6 2001:730:3::1:2a
> traceroute to 2001:730:3::1:2a (2001:730:3::1:2a) from 2001:730:f:3::2, 30 hops max, 16 byte packets
>  1  slask-fe-1.ws.pasop.tomt.net (2001:730:f:3::1)  2.46 ms  0.543 ms  0.455 ms
>  2  casablanca-fe-1.co.pasop.tomt.net (2001:730:f:7::1)  0.941 ms  0.622 ms  0.567 ms
>  3  ed-gw1-si0-0.sand-osl.skjellin.net (2001:730:f:ffff::)  6.56 ms  5.177 ms  5.087 ms
> ^-- hmmm. this was supposed to end at Aorta, not here.
> 
> root@kvass ~ # traceroute6 2001:730:3::1:2b
> traceroute to 2001:730:3::1:2b (2001:730:3::1:2b) from 2001:730:f:3::2, 30 hops max, 16 byte packets
>  1  slask-fe-1.ws.pasop.tomt.net (2001:730:f:3::1)  0.797 ms  0.533 ms  0.455 ms
>  2  casablanca-fe-1.co.pasop.tomt.net (2001:730:f:7::1)  1.077 ms  0.623 ms  0.558 ms
>  3  skjellin-gw1.no.ipv6.aorta.net (2001:730:3::1:2b)  5.068 ms  18.271 ms  5.182 ms
> ^-- alright!
> 
> from ed-gw1:
> 
> root@ed-gw1 ~ # traceroute6 2001:730:3::1:2a
> traceroute to 2001:730:3::1:2a (2001:730:3::1:2a) from ::1, 30 hops max, 16 byte packets
>  1  ip6-localhost (::1)  0.108 ms  0.099 ms  0.033 ms
> ^-- ehem.. this isn't Aorta, is it?
> 
> root@ed-gw1 ~ # traceroute6 2001:730:3::1:2b
> traceroute to 2001:730:3::1:2b (2001:730:3::1:2b) from ::1, 30 hops max, 16 byte packets
>  1  skjellin-gw1.no.ipv6.aorta.net (2001:730:3::1:2b)  0.101 ms  0.089 ms  0.103 ms
> ^-- alright!
> 
> 
> 
> 
> -- 
> Mvh,
> André Tomt
> andre@xxxxxxxxxxx