[openib-general] routing weirdness

[Michael S. Tsirkin]

Hi!
I have a 2 port card with interfaces configured to different subnets.
port 1 is down, port 2 is up.
After some pinging, I see weird stuff in arp tables:
does anyone have a clue why is linux trying to route
packets to 12.4.3.87 trough ib0?


sw086:~ # arp
Address                  HWtype  HWaddress           Flags Mask            Iface
mtlsv13.yok.mtl.com      ether   00:04:AC:A6:1F:B2   C                     eth0
10.4.0.211               ether   00:03:47:24:B3:A3   C                     eth0
swlab37.yok.mtl.com      ether   00:02:B3:2B:2E:1B   C                     eth0
mtls05.yok.mtl.com       ether   00:02:B3:2B:2B:9F   C                     eth0
mtlsws02.yok.mtl.com     ether   00:02:B3:B0:3C:A6   C                     eth0
sw086:~ # ping 11.4.3.87
PING 11.4.3.87 (11.4.3.87) 56(84) bytes of data.

--- 11.4.3.87 ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 1001ms

sw086:~ # ping 12.4.3.87
PING 12.4.3.87 (12.4.3.87) 56(84) bytes of data.

--- 12.4.3.87 ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 1003ms

sw086:~ # arp
Address                  HWtype  HWaddress           Flags Mask            Iface
12.4.3.87                        (incomplete)                              ib0
11.4.3.87                        (incomplete)                              ib0
mtlsv13.yok.mtl.com      ether   00:04:AC:A6:1F:B2   C                     eth0
10.4.0.211               ether   00:03:47:24:B3:A3   C                     eth0
mtlsws09.yok.mtl.com     ether   00:E0:81:05:AF:F4   C                     eth0
swlab37.yok.mtl.com      ether   00:02:B3:2B:2E:1B   C                     eth0
mtls05.yok.mtl.com       ether   00:02:B3:2B:2B:9F   C                     eth0
mtlsws02.yok.mtl.com     ether   00:02:B3:B0:3C:A6   C                     eth0
sw086:~ # ifconfig ib0
ib0       Link encap:UNSPEC  HWaddr 00-00-04-04-FE-80-00-00-00-00-00-00-00-00-00-00
          inet addr:11.4.3.86  Bcast:11.4.255.255  Mask:255.255.0.0
          UP BROADCAST MULTICAST  MTU:2044  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:128
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

sw086:~ # ifconfig ib1
ib1       Link encap:UNSPEC  HWaddr 00-00-04-05-FE-80-00-00-00-00-00-00-00-00-00-00
          inet addr:12.4.3.86  Bcast:12.4.255.255  Mask:255.255.0.0
          inet6 addr: fe80::202:c9ab:e987:fca2/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:2044  Metric:1
          RX packets:264 errors:0 dropped:0 overruns:0 frame:0
          TX packets:412 errors:0 dropped:290 overruns:0 carrier:0
          collisions:0 txqueuelen:128
          RX bytes:21868 (21.3 Kb)  TX bytes:33188 (32.4 Kb)


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