NAT on some interfaces

[#1]

I've got a 7200 router with two 10/100 int's on the inside and a T1 to the Internet. I use my public IP addresses internally so I am not NAT-ing. I want to bring up the 2nd 10/100 inside interface and set up a 192.168.0.0 subnet and have that NAT'd on the 7200. Can I have only the one inside interface doing NAT? What happens to traffic destined for the non-NAT'd internal subnet when the T1 interface has an "ip nat outside" command? Will this cause any problems?

[mark-obrien]

NAT only occurs on traffic going between an "inside" interface and an "outside" interface. Therefore, traffic coming into the "outside" interface and destined for the non-NATed subnet will not be NAT'ed, while packets coming into the "outside" interface destined for the inside, NAT'ed, subnet will be. Assuming that you take care to direct incoming traffic towards the proper interface, you should not have any problems.

HTH,

Mark