Comment 31 for bug 204010

Also encountering the same problem on 2.6.24-15-xen

The bridges are created, a win2k3/xp virtual host works perfectly (after fixing the qemu-ifup script (see bug 201765 )). However when I run a centos 4.6 virtual host I see the same symptoms discussed in this thread. The bridges get created, the devices get added to the bridge, the interfaces are all up.
...
but nothing gets through. It tried it with a manually created bridge and with a bridge i let xen create.

On my domU I see the following after a ping -f:

[root@centosbean ~]# ifconfig
eth0 Link encap:Ethernet HWaddr 00:16:3E:15:13:66
          inet addr:192.168.253.228 Bcast:192.168.253.255 Mask:255.255.255.0
          inet6 addr: fe80::216:3eff:fe15:1366/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:15 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 b) TX bytes:846 (846.0 b)

(not really impressive eh)

When I run xentop I see the following line concerning my virtual instance:

      NAME STATE CPU(sec) CPU(%) MEM(k) MEM(%) MAXMEM(k) MAXMEM(%) VCPUS NETS NETTX(k) NETRX(k) VBDS VBD_OO VBD_RD VBD_WR SSID
    centos --b--- 26 0.0 3584000 85.6 3584000 85.6 4 1 0 11 1 0 3488 1041 32
Net0 RX: 11370bytes 109pkts 0err 14509drop TX: 636bytes 15pkts 0err 0drop

Hence a lot of drops