I Cannot Ping a client from server and vice versa?

I have been configuring a small network by using virtual PC 2007. I have divided the network into two subnets by using RRAS and I'm able to ping one subnet, but not the other one. The IP address on Both of them are Assigned by DHCP server.
I have turned off the ffirewall on all three platforms. what's the reason of not pinging the second subnet.
Note that It replys to the ping with a Request Timed Out reply.

1 - the problem is not with RRAS i guess. because it can send and receive packets from the subnet beyond the routing server.
2- it is a learning-related procedure.

Your router settings are incorrect for the subnets! You have to use the correct subnet mask if you wish routers to communicate between separated networks.

For instance if router one is set to an address of 192.168.1.1 and has a subnet mask of 255.255.255.0 it will ONLY communicate with 192.168.1.x devices. If however the subnet mask is changed to 255.255.252.0 you have now opened more local network availability.
The subnet mask tells the system at what point the network address stops and the hosts addressing starts. With the wrong mask local machines/hosts are isolated.

Here is a great tutorial
http://www.learntosubnet.com

Good Luck.

It sounds like you don't have routing turned on. - Updated , Then you default gateways are not right, I would draw it out on paper and make sure all the gatways a right..

You have a problem with routing.... unless whatever you are pinging is configured to not respond to pings.

Why would you have a small network with two subnets? There usually is no need to segment them... unless you have some special circumstances.