I think that I understood your post to indicate that the router itself can access resources in the Internet (can ping resources by name and by address in the Internet) but want to make sure that I did understand this correctly.
Assuming that it is true that the router does have internet connectivity then we can assume that is is not a basic IP connectivity issues.
The next thing that I would want to check is whether the clients have properly configured default gateway (also properly configured IP address and mask). The easy way to check this is to have the clients attempt to ping to the serial 0/0 interface of the router. My guess is that the clients will not be able to ping the outside interface of the router. Give this a try and let us know the results.
I do not see any HSRP configuration on your lan interface that means no virtual gateway address for your clients which makes me believe your clients must be having gateway address configured for your primary router lan interface and when it crashed clients not able to reach gateway and also not abl to connect to internet.
Ankur's thinking is going in exactly the direction that I indicated in my post. It seems very likely that the clients default gateway was not the interface address of this router. If this router was not their default gateway (and if the device that is their default gateway was down - as you seem to be saying) then that is the reason that clients could not access the Internet.
As for what you should do, I believe that you need to reconsider the functionality of the primary and backup router. As Ankur suggests it would seem logical that the primary and the backup router should run HSRP or do something like this.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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