Cisco 3640 Config NM-16sw Internal Lan Ethernet to Cable Router doing NAT

I have always had my 3640 doing NAT. Now I want to let the ISP's routers that I am connected to do it.

My internal network is is my 3640 VLAN1

My external networks are: ISP1 is a router doing nat or it can be configured with Public IPs. ISP2 is a modem doing nat or it can be configured with Public IPs.

What I need to know is how do I get the VLAN traffic to the ISP's routers without doing NAT on th 3640?

I have read a little on bridging and it seems like that may be what I need, but I am not sure.

The reason I am doing this is because it is my understanding that NAT is completely process switrched and with the current bandwidth that I have available the 3640 can't process switch that many packets.

If I am in error and NAT does not have to be processed switched, I would be interested in hearing any input on how to no process switch NAT.

Thanks in advance for any help or advice.

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