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:

[EMAIL PROTECTED] ~]# 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

-- 
networking not working
https://bugs.launchpad.net/bugs/204010
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