[Xen-users] Network bridge problem

[Ivan Lisenkov <ivan@xxxxxxxxx>]

Hello All!

I have just installed opensuse 11.1 with Xen 3.3.1 on board. Opensuse
has it is own network configuration, it created br0 bridge for Xen
VMs. The problem is, that domUs can't reach network outside dom0 (dom0
itself reachable). My guess that the problem is about arp. tcpdump on
br0 gives this, when I am trying to ping somebody outside dom0:

21:13:15.795291 arp who-has 188.XXX.XXX.1 tell 188.40.63.59
21:13:15.795827 arp reply 188.XXX.XXX.1 is-at 00:21:59:c5:74:c4
21:13:16.795275 arp who-has 188.XXX.XXX.1 tell 188.40.63.59
21:13:16.795753 arp reply 188.XXX.XXX.1 is-at 00:21:59:c5:74:c4

but on vif12.0 (domU virtual card):

21:17:25.571270 arp who-has 188.XXX.XXX.1 tell 188.XXX.XXX.59
21:17:26.571258 arp who-has 188.XXX.XXX.1 tell 188.XXX.XXX.59
21:17:27.571242 arp who-has 188.XXX.XXX.1 tell 188.XXX.XXX.59


So the arp packets simply do not propagate via bridge.


BUT! Some times packets arp go throw bridge! I cannot figure out the
conditions, when it is happen, seems absolutely random.

Any help is much appreciated!


My ifconfig on dom0 look like this:

dom0:~ # ifconfig
br0       Link encap:Ethernet  HWaddr 00:24:21:9C:35:9D
          inet addr:188.XXX.XXX.XXX  Bcast:188.XXX.XXX.63 Mask:255.255.255.192
          inet6 addr: fe80::224:21ff:fe9c:359d/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:265177 errors:0 dropped:0 overruns:0 frame:0
          TX packets:262419 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:344724441 (328.7 Mb)  TX bytes:357504830 (340.9 Mb)

eth0      Link encap:Ethernet  HWaddr 00:24:21:9C:35:9D
          inet6 addr: fe80::224:21ff:fe9c:359d/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:287582 errors:0 dropped:0 overruns:0 frame:0
          TX packets:173595 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:349833376 (333.6 Mb)  TX bytes:21347914 (20.3 Mb)
          Interrupt:249 Base address:0x2000

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:20 errors:0 dropped:0 overruns:0 frame:0
          TX packets:20 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:2004 (1.9 Kb)  TX bytes:2004 (1.9 Kb)

vif12.0   Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING NOARP PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:23 errors:0 dropped:0 overruns:0 frame:0
          TX packets:287 errors:0 dropped:141 overruns:0 carrier:0
          collisions:0 txqueuelen:32
          RX bytes:916 (916.0 b)  TX bytes:51625 (50.4 Kb)

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