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New Member

aDSL Load Balancing Problem with NAT(?)


i have tried to configure LoadBalancing to use it for DSL lines.

First, i want to do it in the LAB where there are no adsl modules so i used 3 2801 and connect them with fastethernet.

I saw an old discussion so i only configured 3 things:

a)Globally IP cef (default)

b)2 ip routes: ip route faste 0/0 and

ip route vlan5

c)ip nat with route map:

route-map conn1 permit 10

match interface FastEthernet0/0


route-map conn2 permit 10

match interface Vlan5


ip nat pool connection2 netmask

ip nat pool connection1 netmask

ip nat inside source route-map conn1 pool connection1 overload

ip nat inside source route-map conn2 pool connection2 overload


i had to use vlan 5 because it is the on;y way the 4-port switch module can act as point-to-point interface.

Seperately it works fine: i shut on interface it works, i shut the other it works. When both are up, only one is performing nat.

Any ideas?




Re: aDSL Load Balancing Problem with NAT(?)

Try to change the default routes to point on the next-hop IP instead of the outgoing interface, like that:

IP route

IP route


IP route F0/0

IP route Vlan5

Best Regards,

Mounir Mohamed

New Member

Re: aDSL Load Balancing Problem with NAT(?)

It have done but as a backup DSL connections..

With two aDSL wic Utilize two PPPOE connections..

If you are interested, kindly inform me to post that configuration..

I'm still trying to do load balancing, could you please inform me if you get any solution..



Arcom Co.

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