Router with dual ISP

[skmdimran]

Dear Concern,

Please find attachment of network diagram the network diagram for details.

1. Two           ISP( for internet) links are connect      in the      router ( 2811).
2. Public IP of ISP 1 are using      between Router and ASA.
3. VPN has been configured with      ISP 1 IP address
4. Three           zone ( Outside , DMZ , Inside) specified on the ASA.
5. In      DMZ      , there are two proxy server ( proxy 1 ,      proxy 2) .
6. Branch           user will use proxy server 1  and      Head      office will use proxy 2.

In the above scenario , is it possible to fulfill the following requirements

1. Proxy1 will use ISP 1 and      proxy 2 will use ISP 2.
2. If ISP1 goes down then proxy 1 will use ISP      2 for internet ( not for VPN )And vice versa.

Please help me how I will configure the router.

Regards

Imran

[Haris P]

Dear Imran ,

This scenario is possible with IOS NAT load balancing with Optimized Edge routing . You can go to the below link for more details

http://www.cisco.com/en/US/tech/tk648/tk361/technologies_configuration_example09186a00808d2b72.shtml

Since you are using public IP's of two ISP's ,there might be some limitaion due to this as the IP's are related with ISP connection .

Regards

Haris P