openvpn tunnel- tunnel is up but issues with routing

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http://serverfault.com – I am having trouble with a site to site tunnel. Both routers are centos based routers. Router A is the server, and router B is the client. The VPN tunnel is established. From router B, I can ping anything on the network of router A. From router A (and the network behind it), I cannot ping anything on the network behind router B, or behind router A. So basically, router B is the only node that can ping anything on the opposite network. Any idea where I should look? They are both running iptables. IP Forwarding is enabled. I am guessing that router B can access anything on router A's netwo (HowTos)