Can someone help me figure out why when I ping my pc from another pc over VPN tunnel I get packet loss and recieve an icmp request but no reply for some packets.

I one site in NY that is connected via L2L VPN to a data center. I also have one site in LA that is connected via L2L VPN to the same data center. How do I go about port forwading traffic from the NY site to the LA site via the VPN tunnels to the dat...