No NAT between two routers

Hello all,

I own a /24 subnet that I've proceeded to chomp into a /26 subnet. I
currently have two routers on the subnet, one for the .0 network and
one for the .64 network. Behind each router I have non-routable
address spaces, i.e. 192.168.101.0/24 behind the .0 router and
192.168.201.0/24 behind the .64 router. Normally I want the non-
routables to be NAT'ed whenever they leave the router, so I have
access lists and ip nat rules set up to nat the non-routables to their
respective router's external address when they leave the router.
However, I would like to be able to set the non-routables to not be
NAT'ed when they leave the router if they are headed for a non-
routable on the other router. For example, if traffic is leaving from
192.168.101.11 to Google, I want it to be NAT'ed to its router's
routable IP address. However, if traffic is leaving from
192.168.101.11 and is going to 192.168.201.58, I don't want it to be
NAT'ed.

Any suggestions on how I can do this? Thanks in advance for your
help.

Bryan

.

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