I doubt its a dsl modem problem.
I have had a Smoothwall firewall and that modem since 2001.
@jimp:
Is there another port on the back of your DSL router that you can try?
No. There is only a single Lan and single Wan connection.
I intend to get another dsl connection and wanted a firewall that
was better suited for dual wan connections. The only problem I have
had with the smoothwall is after about 6 months, it starts to block outbound
connections its not supposed to. For instance, I cannot connect the PS3 to the
playstation network anymore. Another example, is my daughters WOW, it worked
fine for months, and now it will not connect through the smoothwall. If I were to
reinstall the smoothwall, then everything would be fine, but I am tired of having
to reinstall it every 6 months or so and spend the hours reconfiguring all the firewall
rules. I have two boxes with smoothwall on it so when one is down, I can use the
last one until the new one is ready. I need to have a backup one ready to bring online
because I host several websites and services. That is another reason I am looking for
a more robust and secure firewall. Those websites are prone to attack by spammers
because they are used to supply evidence to registrars, LE and ISP's to get sites and IP's
shut down.