[one-users] instance running with IP but can't ping

[song]

> Greetings:
>
>    I use sunstone to create Virtual network and Template,more details 
> listed below:
>
> =======================================================
>      virtual network:
>          Name : net1
>          Mode : default
>          Bridge:br0(I have a bridge on host named br0)
>           Network : fixed  192.168.0.180~192.168.0.200
>    and I added the Gateway and DNS
>
> *************************************************************************
>     templates:
>     CONTEXT=[
>   ETH0_DNS="$NETWORK[DNS, NETWORK=\"net1\"]",
>   ETH0_GATEWAY="$NETWORK[GATEWAY, NETWORK=\"net1\"]",
>   ETH0_IP="$NIC[IP, NETWORK=\"net1\"]",
>   ETH0_MASK="$NETWORK[NETWORK_MASK, NETWORK=\"net1\"]",
>   ETH0_NETWORK="$NETWORK[NETWORK_ADDRESS, NETWORK=\"net1\"]" ]
> CPU="1"
> MEMORY="512"
> NAME="template1"
> NIC=[
>   NETWORK="net1",
>   NETWORK_UNAME="oneadmin" ]
> OS=[
>   ARCH="x86_64",
>   BOOT="hd" ]
> RAW=[
>   TYPE="kvm" ]
> TEMPLATE_ID="46"
> ===============================================
>
> After doing all of this ,I run a instance with image from marketplace 
> named virtual router,instance startup with image from marketplace too 
> named ubuntu 12.04  running with an expected Ip 192.168.0.180,but I 
> can't ping it.I wanna to know why and how can I make it work?
>
> Thanks for your reading!