I have 1811 with 2 ISP connection, both over fastEthernet ports. I did the 1 ISP route as primery and the seconf ISP as backup. The problem is that first ISP has DNS server 212.X.X.X and the second ISP has DNS 85.X.X.X. These are different ISP and every dns server works only with IP's from the same ISP.
Lets say that i have configured DNS servers like this:
ip name-server 212.X.X.X
ip name-server 85.X.X.X
Now if ISP1 goes down, ISP2 goes up and i have internet connection, but DNS server does not work, because router ask 212.X.X.X first that does not respond to IP of ISP2.
So how can i configure the Cisco to use second DNS server if uses ISP2 and first DNS server if it uses ISP1????
I hope i explained my problem in almost good manner :)
Pls help guys!
Thx in advance.