I am coming to the conclusion that I am truly confused.
Since I don't know how to even begin configuring what I want to do, let me explain the result I want and see if it is even possible.
I have a Cisco 3640 that is connected to two different ISP supplied routers connected to 2 different ISPs, on two different networks one is 24.0.0.0/30 and the other is 66.0.0.0/30, both ISP supplied routers are capable of NAT on their own. Currently my 3640 is doing all of the NAT. This was no problem before I upgraded from 3Mb to 7Mb pipes.
It is my understanding that NAT is completely process switched (please correct me if I am wrong). My 3640 cannot handle process switching even one of the two 7Mb pipes that I now have.
Both ISP supplied routers have one public static IP address on the WAN side and 5 private static IP addresses for the built in switch on the LAN side, one 192.168.1.0/29 and the other 192.168.0.0/29. I can get as many public or private IP addresses as I ask for, for the LAN side from both ISPs if I need them.
I only have 16 machines connected to the 16 port switch network module in the 3640. My internal LAN network 192.168.144.96/27 VLAN 1 ip address 192.168.144.126
I want to unload all of the NAT from the 3640 and let the ISP supplied routers take care of it.
I am not looking for someone to configure this for me, just a nudge in the right direction. Possibly a link to the appropriate command set or a configuration example.
I have probably included information you don't need and not included information you do. Anything you need to know I will do my best to post.
I understand that everyone's time is valuable and I appreciate very much the opportunity to present my problem for your review.
Many thanks in advance for your time.
Chris