multihoming

[v.santhosh]

in 1700 router we have two isp connections)serial) and one ethernet port. we want to have two different private networks and the traffic has to go through the relavant serial links. ie one isp at s0 and other is at s1. using nat created private pools for each isp network. for say 192.168.x.x(ISP1) and 10.x.x.x(ISP2). If I use 192.168.x.x the traffic has to go through so and same for 10.x.x.x. what policy should i create in the router. pls reply

[aravindhs]

Hello Santhosh!

U can accomplish this with route-maps and dual ip nat commands.

For eg, lets say ur first local network is 192.168.1.0/16 and your second network is 10.1.0.0/16

And your isp1 address is 100.1.1.1 and your isp 2 address is 200.1.1.1...

access-list 100 permit 192.168.1.0 0.0.0.255

access-list 200 permit 10.1.0.0 0.0.255.255

route-map FOR_ISP1

match ip address 100

route-map FOR_ISP2

match ip address 200

int e0

ip nat inside

int s0

ip nat outside

int s1

ip nat outside

ip nat pool ISP1 100.1.1.1 100.1.1.1 prefix-length 24

ip nat pool ISP2 200.1.1.1 200.1.1.1 prefix-length 24

conf t

ip nat inside source route-map FOR_ISP1 pool ISP1 overload

ip nat inside source route-map FOR_ISP2 pool ISP2 overload

and

verify it by using ;

sh ip nat translation

sh ip nat stat

clear ip nat trans *

This should do the trick for U.

Try it out and please let us know.

Cheers

Arav