We have a 100Mb Ethernet circuit connecting 2 sites. I bought 2 Vigor 2920 routers (on the advice of Draytek Sales) to sit at each end of the circuit to provide basic routing between the sites. I am experienced in configuring routers, such as Allied Telesis and Cisco, but cannot get these two devices to provide effective routing. For example, if I try to ping from a device on one subnet across the Vigor routers to the other subnet I get no response. However, I can ping the other router's WAN port successfully. This lack of connectivity/communication is true for other traffic types. It would seem traffic doesn't know how to get back to the originating subnet, but I have ensured all settings are correct.

Setup as follows:-

Router 1
LAN 1: 192.168.31.3/24
WAN 1: 192.168.52.1/24, GW: 192.168.52.2

Router 2
LAN 1: 192.168.34.1/24
WAN 1: 192.168.52.2/24 GW: 192.168.52.1

Can anyone offer any words of advice?