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do you have a functional return route back to those client addresses? the normal thing would be to do ip masquarading, but as you're using internet ip's already, which i assume you paid for or something, you shouldn't need it. but you'll only not need it if there are valid return routes back to it. you can eliminate the ip_forward part of the equation for simpicity and try pinging from the linux router with the internal interface address, e.g. ping -I eth1. if that works then the rest of the routing is fine, and maybe you have a firewall issue on the box? also when pinging, run tcpdump on eth0 to see that the icmp packets are actually leaving your linux router, that's a great point of demarcation to get over.
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