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(usagi-users 02456) Problem with neighbor solicitation

Hi, some problem arose when I used usagi.

There are two hosts:

Linux crow 2.4.20 #1 Mon Jul 7 17:12:22 MSD 2003 i586 unknown



diam@crow:~$ ifconfig
eth0      Link encap:Ethernet  HWaddr 00:20:AF:38:DA:2F
          inet addr:195.208.32.213  Bcast:195.208.32.255  Mask:255.255.255.0
          inet6 addr: fe80::220:afff:fe38:da2f/64 Scope:Link
          inet6 addr: ::ffff:0:c3d0:350b/96 Scope:Global
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:4109 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2815 errors:0 dropped:0 overruns:0 carrier:1
          collisions:1 txqueuelen:100
          RX bytes:463854 (452.9 KiB)  TX bytes:245242 (239.4 KiB)
          Interrupt:5 Base address:0x320



lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:2510 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2510 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:376020 (367.2 KiB)  TX bytes:376020 (367.2 KiB)



diam@crow:~$ ndp -a
Neighbor                        Linklayer Address  Netif Expire    St Flgs
Prbs



and

Linux rabbit 2.4.20 #2 Fri May 16 11:07:07 MSD 2003 i686 unknown



[diam@rabbit diam]$ ifconfig
eth0      Link encap:Ethernet  HWaddr 00:D0:B7:C6:C7:28
          inet addr:192.168.30.215  Bcast:192.168.30.255  Mask:255.255.255.0
          inet6 addr: fe80::2d0:b7ff:fec6:c728/64 Scope:Link
          inet6 addr: ::ffff:0:c3d0:3509/96 Scope:Global
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:309 errors:0 dropped:0 overruns:0 frame:0
          TX packets:165 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          RX bytes:22634 (22.1 KiB)  TX bytes:15097 (14.7 KiB)
          Interrupt:11 Base address:0xdf00 Memory:fd7ff000-fd7ff038



eth1      Link encap:Ethernet  HWaddr 00:60:94:23:F5:BD
          inet addr:195.208.32.215  Bcast:195.208.32.255  Mask:255.255.255.0
          inet6 addr: fe80::260:94ff:fe23:f5bd/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:21966 errors:0 dropped:0 overruns:0 frame:0
          TX packets:13944 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          RX bytes:2923072 (2.7 MiB)  TX bytes:2116562 (2.0 MiB)
          Interrupt:11 Base address:0xdf80 Memory:f32ff000-f32ff038



lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:85 errors:0 dropped:0 overruns:0 frame:0
          TX packets:85 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:6832 (6.6 KiB)  TX bytes:6832 (6.6 KiB)





[diam@rabbit diam]$ ndp -a
Neighbor                        Linklayer Address  Netif Expire    St Flgs
Prbs
::ffff:0:c3d0:350a              00:50:04:6b:b8:3f   eth0 unknown    S
::ffff:0:c3d0:350b                                  eth0 unknown    F
fe80::250:4ff:fe6b:b83f         00:50:04:6b:b8:3f   eth0 unknown    S



Now we do ping6 from second host to first:



[diam@rabbit diam]$ ping6 ::ffff:0:c3d0:350b
PING ::ffff:0:c3d0:350b(::ffff:0:c3d0:350b) from ::ffff:0:c3d0:3509 : 56
data by
tes
From ::ffff:0:c3d0:3509 icmp_seq=1 Destination unreachable: Address
unreachable
From ::ffff:0:c3d0:3509 icmp_seq=2 Destination unreachable: Address
unreachable
From ::ffff:0:c3d0:3509 icmp_seq=3 Destination unreachable: Address
unreachable



--- ::ffff:0:c3d0:350b ping statistics ---
4 packets transmitted, 0 received, +3 errors, 100% loss, time 3025ms



and see:



17:13:32.219391 ::ffff:0:c3d0:3509 > ff02::1:ffd0:350b: icmp6: neighbor sol:
who
 has ::ffff:0:c3d0:350b
17:13:33.219385 ::ffff:0:c3d0:3509 > ff02::1:ffd0:350b: icmp6: neighbor sol:
who
 has ::ffff:0:c3d0:350b
17:13:34.219383 ::ffff:0:c3d0:3509 > ff02::1:ffd0:350b: icmp6: neighbor sol:
who
 has ::ffff:0:c3d0:350b



There is no answer.



But if we add duplicated address, answer exist:



19:32:15.608354 fe80::2d0:b7ff:fec6:c728 > ff02::1:ffd0:350b: HBH icmp6:
multica
st listener report max resp delay: 0 addr: ff02::1:ffd0:350b [hlim 1]
19:32:15.802498 :: > ff02::1:ffd0:350b: icmp6: neighbor sol: who has
::ffff:0:c3
d0:350b
19:32:15.802827 ::ffff:0:c3d0:350b > ip6-allnodes: icmp6: neighbor adv: tgt
is :
:ffff:0:c3d0:350b
19:32:16.512497 fe80::2d0:b7ff:fec6:c728 > ff02::1:ffd0:350b: HBH icmp6:
multica
st listener report max resp delay: 0 addr: ff02::1:ffd0:350b [hlim 1]



So, in first case host rejected incoming packet, in second case - accepted
packet for the same address.

Please, help me solve this problem.



Dmitrij Moskalev,

ISP.