I have a pool of ip address one the WAN link which is terminated at PIX. The inside interface of PIX is terminated on the switch. Now i have to add the Router in the network for GRE communication and want to use the one ip address of this pool on the router. The PIX has only two interfaces and i dont want to change its configuration. Please guide, can i terminate the WAN connection of L2 switch and connect both Router and PIX to the switch. How can i use this ip pool on both of these or is there any other way.