DSL Load Balancing 1811

Unanswered Question
Mar 17th, 2008
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I have configured a 1811 for dual WAN using two default routes and tracking it with IP SLA. I am also using route maps for nat.

Here is my relevant config on the 1811.

ip sla 1

icmp-echo ip1 source-interface FastEthernet1

timeout 1000

threshold 30

frequency 3

ip sla schedule 1 life forever start-time now

ip sla 2

icmp-echo ip2 source-interface FastEthernet0

timeout 1000

threshold 30

frequency 3

ip sla schedule 2 life forever start-time now

track 100 rtr 1 reachability


track 101 rtr 2 reachability

ip route ip1 track 100

ip route ip2 track 101

ip nat inside source route-map ISP1 interface FastEthernet0 overload

ip nat inside source route-map ISP2 interface FastEthernet1 overload


access-list 100 permit ip any




route-map ISP1 permit 10

match ip address 100

match interface FastEthernet0


route-map ISP2 permit 10

match ip address 100

match interface FastEthernet1

This is working fine for outgoing traffic.

Now I want to direct all inbound traffic to a particular internal IP(ex This can be either from both isp's or even from one.

How can I achieve this?

I tried a static nat translation in addition with the route map nat entires (ip nat inside source static interface fa1) but then it began using only the ISP with the static nat statement(only fa1) and load balancing stopped working.

Any ideas?



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aseychell Fri, 03/21/2008 - 10:25
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Thanks but there is nothing related to what I was asking.

Those are just basic configuration guides.

Ok what you will need to do is configure both static and dynamic Nat on each interface. I know I have done that on 1 wan routers before but using the same configs I have not been able to recreate this on an 1811. I have had to chose one or the other per interface.

If anyone knows of a way to do this I would love to know it.


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