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NAT and routing for one router and two ISPs

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Last Modified: 2012-05-11
I have a Cisco ISR with three fast ethernet connections - 1 is local lan, 1 is ISP A and 2 is ISP B.
Say the local LAN is private IP subnet 192.168.100.0/24.  The interface to ISP A is 192.168.66.10 and the route to the Internet via ISP A is 192.168.66.1.  The interface to ISP B is 192.168.77.10 and the route to the Internet via ISP B is 192.168.77.1.  I would like all traffic destined for 11.0.0.0/8 to NAT to ISP A interface IP 192.168.66.10 and route out same.  I would like all other internet traffic the default 0.0.0.0 route to NAT to the ISP B interface IP 192.168.77.10 and route out that interface.  How would I accomplish this?
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Sounds like you need policy based routing. See if this helps:

http://www.cisco.com/en/US/docs/ios/12_0/qos/configuration/guide/qcpolicy.html
amigan_99Network Engineer

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Commented:
craigbeck: Just to verify - I think you mean the second ip nat inside to read


ip nat inside source list 101 interface FastEthernet1/0 overload

..right?
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amigan_99Network Engineer

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Commented:
Most helpful - thank you!
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