We configured cisco router 2620 to get access to internet initially. Then we will put a pix firewall inside of router.

We configured internal interface of router and out side interface of the router also. configure static nat as per documentation of CISCO web site.

Now the router can ping all interfaces of router, ISP gateway. can ping web address (i.e, yahoo.com).

But from the host that is connected thru a switch to the router inside interface can ping till outside interface of router but can't ping gateway of Service Provider, and can't go to internet.

I would appreciate help regarding same.

Thanks