> I've got one for the books: I've got my main machine set up as a firewall.
> I've got two others on the network behind it. One machine can ping, request
> and get web pages, etc...the other can't. I sends the request, it knows what
> the IP address of the page is, but it can't receive the request back. This is
> only on stuff that is beyond the FW. Pings fail, etc...
>
> What could be causing this problem?
>
What are the three machines' OS(es)? What are the three IP addresses?
Could this be a reverse DNS problem (can the non-receiving machine
successfully telnet/SSH into the firewall machine)? Running a tool such
as tcpdump on the firewall's external interface, are the non-receiving
machine's packets being sent beyond the firewall? Are the responding
packets coming back to the external interface of the firewall? You
might also need to post your firewall rules to get good answers.
--ronan
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