Unable to connect to network after Installing Oracle VM server 2.2.1

Dear All,
I have downloaded Oracle VM Server 2.2.1 from Oracle E-Delivery Site.
I installed it on one server. But after installing it I am not able to connect to the network.
When I am trying to ping other servers, it says Destination Host Unreachable.
Do I need to install something for NIC like eth0 or xenbr0... or network connectivity?
Can anyone have soluiton of this problem?
Yours views & comments are highly appreciated.
Thanks in Advance.

This is the output of
# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
172.16.1.0 0.0.0.0 255.255.255.0 U 0 0 0 xenbr0
172.16.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
0.0.0.0 172.16.1.254 0.0.0.0 UG 0 0 0 xenbr0
I checked on other machines on same network, they have configured same netmask configured.

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