Pb concerning the re-sending interfaces in proxy radius configuration

Hi! I'va installed freeradius on my Computer as a reverse proxy.This computer has 2 network interfaces (eth0 and eth1).The problem is this one: -the proxy receive the radius packet on the front interface (eth0) but can't re-send the packet on the eth1 interface. The configuration of the proxy seems to be good because this one display to me a message telling: "re-sending" the packet to 192.168.2.1 (radius server).Moreover, there is a rule in the routing table in order to go to the server 192.168.2.1.If i launch a tcpdump on the eth1 interface, no packet are leaving. Is there something to do in the configuration of the proxy to tell him the interface to re-send the packets? Thanks a lot in advance! Cordialy