[Bug 785668] Re: bonding inside a bridge does not update ARP correctly when bridged net accessed from within a VM

[Louis Bouchard]

I read the mail and did a first round of test before I could check the
setting of the switch.  Here are the transcript of the test with
balance-rr.

Container : LXC container with fixed IP
VMhost : The host where the LXC container runs. configured with br0 & bond0
remote_host : another host on the same bridged subnet

Container : date;ping xxx.xxx.xxx.87
Mon May 30 15:40:49 UTC 2011
PING xxx.xxx.xxx.87 (xxx.xxx.xxx.87): 48 data bytes
60 bytes from xxx.xxx.xxx.92: Destination Host Unreachable
Vr HL TOS  Len   ID Flg  off TTL Pro  cks      Src      Dst Data
 4  5  00 4c00 0000   0 0040  40  01 cc4e xxx.xxx.xxx.92  xxx.xxx.xxx.87 
60 bytes from xxx.xxx.xxx.92: Destination Host Unreachable
Vr HL TOS  Len   ID Flg  off TTL Pro  cks      Src      Dst Data
 4  5  00 4c00 0000   0 0040  40  01 cc4e xxx.xxx.xxx.92  xxx.xxx.xxx.87 
60 bytes from xxx.xxx.xxx.92: Destination Host Unreachable
Vr HL TOS  Len   ID Flg  off TTL Pro  cks      Src      Dst Data
 4  5  00 4c00 0000   0 0040  40  01 cc4e xxx.xxx.xxx.92  xxx.xxx.xxx.87 
^C--- xxx.xxx.xxx.87 ping statistics ---
4 packets transmitted, 0 packets received, 100% packet loss


VMhost : date;ping xxx.xxx.xxx.92
Mon May 30 15:41:14 EDT 2011
PING xxx.xxx.xxx.92 (xxx.xxx.xxx.92) 56(84) bytes of data.
64 bytes from xxx.xxx.xxx.92: icmp_req=9 ttl=64 time=10.1 ms
64 bytes from xxx.xxx.xxx.92: icmp_req=10 ttl=64 time=0.087 ms
64 bytes from xxx.xxx.xxx.92: icmp_req=11 ttl=64 time=0.076 ms
^C
--- xxx.xxx.xxx.92 ping statistics ---
11 packets transmitted, 3 received, 72% packet loss, time 10004ms
rtt min/avg/max/mdev = 0.076/3.423/10.108/4.727 ms


Container : date;ping xxx.xxx.xxx.87
Mon May 30 15:41:41 UTC 2011
PING xxx.xxx.xxx.87 (xxx.xxx.xxx.87): 48 data bytes
60 bytes from xxx.xxx.xxx.92: Destination Host Unreachable
Vr HL TOS  Len   ID Flg  off TTL Pro  cks      Src      Dst Data
 4  5  00 4c00 0000   0 0040  40  01 cc4e xxx.xxx.xxx.92  xxx.xxx.xxx.87 
60 bytes from xxx.xxx.xxx.92: Destination Host Unreachable
Vr HL TOS  Len   ID Flg  off TTL Pro  cks      Src      Dst Data
 4  5  00 4c00 0000   0 0040  40  01 cc4e xxx.xxx.xxx.92  xxx.xxx.xxx.87 
60 bytes from xxx.xxx.xxx.92: Destination Host Unreachable
Vr HL TOS  Len   ID Flg  off TTL Pro  cks      Src      Dst Data
 4  5  00 4c00 0000   0 0040  40  01 cc4e xxx.xxx.xxx.92  xxx.xxx.xxx.87 
^C--- xxx.xxx.xxx.87 ping statistics ---
4 packets transmitted, 0 packets received, 100% packet loss


remote_host : date;ping xxx.xxx.xxx.92
lundi 30 mai 2011, 15:42:03 (UTC+0200)
PING xxx.xxx.xxx.92 (xxx.xxx.xxx.92) 56(84) bytes of data.
64 bytes from xxx.xxx.xxx.92: icmp_req=1 ttl=64 time=284 ms
64 bytes from xxx.xxx.xxx.92: icmp_req=2 ttl=64 time=125 ms
64 bytes from xxx.xxx.xxx.92: icmp_req=3 ttl=64 time=134 ms
^C
--- xxx.xxx.xxx.92 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 125.282/181.561/284.952/73.204 ms


Container : Mon May 30 15:42:24 UTC 2011
PING xxx.xxx.xxx.87 (xxx.xxx.xxx.87): 48 data bytes
56 bytes from xxx.xxx.xxx.87: icmp_seq=0 ttl=64 time=141.506 ms
56 bytes from xxx.xxx.xxx.87: icmp_seq=1 ttl=64 time=153.311 ms
56 bytes from xxx.xxx.xxx.87: icmp_seq=2 ttl=64 time=124.973 ms
^C--- xxx.xxx.xxx.87 ping statistics ---
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max/stddev = 124.973/139.930/153.311/11.622 ms

I will send you the dump data directly.  Now that I have full access to
our switch, I will do more tests tomorrow.  As far as I know, the switch
is doing automatic trunking so the switch should not be an issue.

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https://bugs.launchpad.net/bugs/785668

Title:
  bonding inside a bridge does not update ARP correctly when bridged net
  accessed from within a VM