Thus spake oinkfreebiker@att.net
> So I expected to be able to ping, ftp and telnet both 
> ways (server->client and client->server). And indeed, I 
> can ping both ways. But I can only ftp and telnet one 
> way, server-to-client. From client-to-server, both ftp 
> and telnet will time out.

Might be some weird routing issue but it just smells like DNS to me.  Are
you pinging by name or number?  Have you tried adding entries to /etc/hosts
to guarantee lookup both ways?  Remember, you don't always see the problem
looking up the remote siste.  Sometimes the problem is the server doing
a reverse lookup on you.  Telnet does this but ping doesn't.

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