I have a Cisco Pix which currently has an internal, dmz and outside interface. My outside is my default route, however I have now new separate connection (interface 4) that connects to the internet also that I would like to route some outside bound traffic through. As i understand it you can only NAT on one interface on the PIX so i thought I could use an old 2800 series router to NAT traffic that goes out from this new interface 4.
My question is in 2 parts, firstly how can I set up traffic from my inside network to go certain destinations through my new interface un-natted(there will only ever be 10 destination addresses that I want to use this for... eg 204.55.x.x)... do i have to set up a static route to direct traffic to these destinations to go out thru my new interface? And secondly can I get this traffic to go out this new interface 4 un-natted so that it hits the 2800 series router's inside interface and gets natted by this router on the way out, in which case what do i set the interfaces IP's as?
eg. Existing outside 80.x.x.x (also my default route), inside network (172.20.x.x), dmz (172.16.x.x), new interface 4 (not sure how to set it up ?.?.?.?), external interface on new 2800 series 89.x.x.x
I hope this makes sense to someone? Please let me know if more clarification will help!