windows server 2003 nat problem

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windows server 2003 nat problem

hi. i just configured a windows server 2003 nat router this way. I wanted to have two separate networks. the main network is connected to the internet via a cisco router. the internal address range for this network is -

the other network uses as the address of one NIC of the windows server. the other NIC where NAT takes place is

the configuration works except that I cannot ping from any machine on network but i can ping network from network.

pliz help on how i can block machine on network pinging network.