[Xen-users] domU not able to access external network

["ashutosh mehra" <mehra.ashutosh@xxxxxxxxx>]

I have Xen 3.2 with ubuntu-hardy as dom0 and domU.
domU and dom0 are able to ping each other. While dom0 is able to access external network, domU fails to do so.

This is my configuration file for domU:
************************************************8
kernel      = '/boot/vmlinuz-2.6.24-19-xen'
ramdisk     = '/boot/initrd.img-2.6.24-19-xen'
memory      = '128'
root        = '/dev/hda2 ro'
disk        = [
                  'tap:aio:/home/xen/domains/xen1.hardy.com/swap.img,hda1,w',
                  'tap:aio:/home/xen/domains/xen1.hardy.com/disk.img,hda2,w',
              ]
name        = 'xen1.hardy.com'
dhcp        = 'dhcp'
vif         = [ 'mac=00:16:3E:7E:85:8A' ]
>on_reboot   = 'restart'
on_crash    = 'restart'
extra = '2 console=xvc0'
*******************************************

This is the result of ifconfig on domU:
*******************************************
eth0      Link encap:Ethernet  HWaddr 00:16:3e:7e:85:8a 
          inet addr:123.237.221.140  Bcast:123.237.223.255  Mask:255.255.248.0
          inet6 addr: 2002:7bed:dd03:4:216:3eff:fe7e:858a/64 Scope:Global
          inet6 addr: 2002:7bed:d99f:4:216:3eff:fe7e:858a/64 Scope:Global
          inet6 addr: fec0::4:216:3eff:fe7e:858a/64 Scope:Site
          inet6 addr: fec0::9:216:3eff:fe7e:858a/64 Scope:Site
          inet6 addr: 2002:7bed:dbc8:9:216:3eff:fe7e:858a/64 Scope:Global
          inet6 addr: fe80::216:3eff:fe7e:858a/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:153833 errors:0 dropped:0 overruns:0 frame:0
          TX packets:339 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:44702020 (42.6 MB)  TX bytes:41663 (40.6 KB)

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:4 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:936 (936.0 B)  TX bytes:936 (936.0 B)
*******************************************

This is result of ifconfig on dom0:
*******************************************
eth0      Link encap:Ethernet  HWaddr 00:17:08:2e:f0:38 
          inet addr:123.237.218.27  Bcast:123.237.223.255  Mask:255.255.248.0
          inet6 addr: 2002:7bed:dd03:4:217:8ff:fe2e:f038/64 Scope:Global
          inet6 addr: 2002:7bed:d99f:4:217:8ff:fe2e:f038/64 Scope:Global
          inet6 addr: fec0::4:217:8ff:fe2e:f038/64 Scope:Site
          inet6 addr: fec0::9:217:8ff:fe2e:f038/64 Scope:Site
          inet6 addr: 2002:7bed:dbc8:9:217:8ff:fe2e:f038/64 Scope:Global
          inet6 addr: fe80::217:8ff:fe2e:f038/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:100339 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6026 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:13079829 (12.4 MB)  TX bytes:1102556 (1.0 MB)

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:88 errors:0 dropped:0 overruns:0 frame:0
          TX packets:88 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:4400 (4.2 KB)  TX bytes:4400 (4.2 KB)

peth0     Link encap:Ethernet  HWaddr 00:17:08:2e:f0:38 
          inet6 addr: fe80::217:8ff:fe2e:f038/64 Scope:Link
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:180678 errors:0 dropped:0 overruns:0 frame:0
          TX packets:5976 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:57972238 (55.2 MB)  TX bytes:1117217 (1.0 MB)
          Interrupt:16

vif1.0    Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff 
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:341 errors:0 dropped:0 overruns:0 frame:0
          TX packets:156172 errors:0 dropped:466 overruns:0 carrier:0
          collisions:0 txqueuelen:32
          RX bytes:36973 (36.1 KB)  TX bytes:45273041 (43.1 MB)
*******************************************

'brctl show' displays:

bridge name    bridge id        STP enabled    interfaces
eth0        8000.0017082ef038    no        peth0
                            vif1.0

Should the MAC address of eth0 in domU and dom0 be same?
Do I need to make any changes in configuration file?

Thanks,
Ashutosh

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