How to ensure connectivity when 1 of 2 connected ISPs goes down

mwong · ‎01-29-2008

I have a newbie question involving the following scenario:

WAN Router with 2 WIC cards are connected to 2 ISPs:

Internal network > Firewall > WAN Router (ISP1 1.1.1.1/24, ISP2 2.2.2.2/24)

Publicly available servers are currently nat'ed by the firewall to one ISP's subnet, eg. 1.1.1.25. But if that ISP goes down, we have to manually change the nat rule to switch to the other ISP. The site is running BGP (don't think it's advertising anything). Is there a better way to maintain connectivity if one ISP goes down?

Thanks in advance.

spremkumar · ‎01-31-2008

Hi

Can you clarify how your remote users are accessing the servers without any service disruption ???

I feel wihtout your own ip blocks you wont be able to provide the access without any service disruption.

Also can you post the config of your router ?

regds