v6 mysteriously unreachable routes (2.2.15pre15)

[Rafal Maszkowski]

3ffe:8010:22:1::3 is unreachable:

root w 6bone-gw:~,0# /usr/inet6/bin/ping 3ffe:8010:22:1::3
PING 3ffe:8010:22:1::3 (3ffe:8010:22:1::3): 56 data bytes
ping: sendmsg: Network is unreachable
ping: wrote 3ffe:8010:22:1::3 64 chars, ret=-1
ping: sendmsg: Network is unreachable
ping: wrote 3ffe:8010:22:1::3 64 chars, ret=-1

--- 3ffe:8010:22:1::3 ping statistics ---
2 packets transmitted, 0 packets received, 100% packet loss

even though there is a route there:

root w 6bone-gw:~,0# route -A inet6 | grep agar
3ffe:8010:22::2/128                         3ffe:8010:22::2                         UC    0      975       1 agaran
3ffe:8010:22::2/128                         ::                                      U     1024   0        0 agaran
3ffe:8010:22::/126                          ::                                      UA    256    99       0 agaran
3ffe:8010:22::/48                           fe80::d519:a90a                         UG    1024   0        0 agaran
fe80::/10                                   ::                                      UA    256    0        0 agaran
ff00::/8                                    ::                                      UA    256    0        0 agaran

Deleting /48 twice and adding back helps. I am trying to investigate another
prefixes with the same problem. ip rou list table all  shows e.g.:


local 3ffe:8010:28::1 via :: dev lo  metric 0  mtu 3924 rtt 300
3ffe:8010:28::2 via 3ffe:8010:28::2 dev bnet  metric 0

    cache  users 1 used 80 age 32sec mtu 1480 rtt 300
3ffe:8010:28::2 dev bnet  metric 1024  mtu 1480 rtt 300
3ffe:8010:28::/126 via :: dev bnet  proto kernel  metric 256  mtu 1480 rtt 300
unreachable 3ffe:8010:28::/48 dev lo  metric 1024  error -51 mtu 3924 rtt 300
3ffe:8010:28::/48 via fe80::d4a0:bc01 dev bnet  metric 1024  mtu 1480 rtt 300


Where this unreachable /48 could be coming from? Is it my naughty mrtd or what?
Or could it be cached as such when the BGP session wasn't sending it yet? But
why it stays when we finally got it from BGP?


thanks

R.
-- 
Ale kto by mył ręce po przywitaniu się z mężem? - A. Fedorczyk