What IP to use for NAT?

[CiscoBrownBelt]

Ok let's say my internal network subnets are on 10.1.X.X /24, and the IP on the edge router that connects to the ISP is 50.50.50.49 and the ISP is 50.50.50.50. What is the IP I would use to NAT my 10.1.X network? I am not using 50.50.50.49 correct?

[CiscoBrownBelt]

 Lets say I have 2 different internal subnets.

Ok so if these two different internal subnets on the inside 2 different inside interfaces on the FW are natted to the same public IP, then that traffic goes to the edge router, how do I send let's say natted subnet 192.168.200.X to one public IP, then the the other subnet 192.168.300.X to let's say another gateway like a tunnel?

[CiscoBrownBelt]

 Lets say I have 2 different internal subnets.

Ok so if these two different internal subnets on the inside 2 different inside interfaces on the FW are natted to the same public IP, then that traffic goes to the edge router, how do I send let's say natted subnet 192.168.200.X to one public IP, then the the other subnet 192.168.300.X to let's say another gateway like a tunnel?

[Alex Pfeil]

You can use PAT for all internet traffic. You would then no-nat the traffic that is going out a tunnel.

[CiscoBrownBelt]

can you give me an example based on the info.

So if I have two internal subnets from FW being natted, then that traffic hits the edge router, how do I nat these?