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Internet Conection

i have a router 2600 conect to the internet with to ISP, when one fail the others start work and so.

I want to configure to work the both together with balancig.

After the router we have a ISA Server and his internal address use a NAT to get out. Some one can suggest something.


Re: Internet Conection

Hi Ricardo,

If you have 2 ISP's coming on a single router, you can use policy based routing and NAT to acheive to send traffic over both the links.

You have to segregate the traffic over these two links. i.e Either based on few inside networks or the traffic that is originating from your network you can load-balance the traffic over the links. For example you can segregate the traffic based on few vlans i.e. vlan1 and vlan2 will use the ISP1 link and vlan3 and vlan4 will use the ISP2 link.

Another example, use ISP1 link for FTP and mail traffic and other link for internet traffic.Use PBR to acheive this and then use NAT on the router to enable the natting.

HTH, Please rate if it does.

-amit singh

Re: Internet Conection


I agree with Amit, actually if you have a dual link to Internet, its kind of a difficult to achieve the true load-balancing and load-sharing effect without a specialized device (e.g. F5 or Radware Linkproof).

The easiest way to achieve this would be to have your Source Traffic split into two and based on the PBR you can achieve the Load Sharing effect.

If you require any further information, please feel free to get back to us.


Wilson Samuel

New Member

Re: Internet Conection

thanks Samuel

If you can post for me an example for config.

Re: Internet Conection

You can do something like this

considering you have 2 subnets &

route-map ISP 2 permit 1

match ip address 111

set ip next-hop

apply the route map to the incoming interface

access-list 111 permit ip any

ip route

Create a NAT pool and apply it on the interfaces

HTH, rate if it does


New Member

Re: Internet Conection

Hi ricardo:

the cisco have a feature named oer, I think that is more better to solve your question, the oer can balance inbound and outbound traffic by many useful parament.

hope it help.

New Member

Re: Internet Conection

hi i atach my config...

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