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[virt-tools-list] KVM guest doesn't recongize its network with NAT mode



Hi all,

I created one guest on Ubuntu 10.10 using the following command: (using default network)
=============================
sudo virt-install --connect qemu:///system -n ubuntu-10.10-guest -r 1024 --vcpus=1 -c /tmp/ubuntu-10.10-desktop-i386.iso --os-type=linux --disk=/var/lib/libvirt/images/ubuntu-10.10-guest.img,size=10 --vnc --accelerate


After the installation done, I can see the virtual network adapters on host:
=============================
virbr0    Link encap:Ethernet  HWaddr fe:54:00:43:f2:f2 
          inet addr:192.168.122.1  Bcast:192.168.122.255  Mask:255.255.255.0
          inet6 addr: fe80::9cfc:d9ff:fe82:f273/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:61 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:10802 (10.8 KB)
...
vnet0     Link encap:Ethernet  HWaddr fe:54:00:43:f2:f2 
          inet6 addr: fe80::fc54:ff:fe43:f2f2/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:100 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:500
          RX bytes:0 (0.0 B)  TX bytes:9325 (9.3 KB)


sudo iptables -t nat -L 
=================================
Chain POSTROUTING (policy ACCEPT)
target prot opt source destination
MASQUERADE tcp -- 192.168.122.0/24 !192.168.122.0/24 masq ports: 1024-65535
MASQUERADE udp -- 192.168.122.0/24 !192.168.122.0/24 masq ports: 1024-65535
MASQUERADE all -- 192.168.122.0/24 !192.168.122.0/24


But on guest, I can only see the lo network and the guest cannot reach outside.
Does anyone know how to configure KVM with NAT mode?

thanks,
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