FAQs

Q:	Why doesn't program X work?
Q:	Why can't I connect to anything?
Q:	How do I verify that my address is being translated properly?
Q:	What does a good firewall architecture look like?

Answers

If you find yourself administering a firewall, NAT device, proxy, or something similar, invariably you will get questions like this: "I just downloaded a beta of a new streaming media protocol called 'foo' and it doesn't seem to work. Can you fix it?" For whatever reason, streaming media protocols have a strong tendency to use reverse connections. Here's what you can do to try to get it to work:

?	Visit the Web site for the vendor that produces the program. Often, they maintain a FAQ about how to get their protocol to cooperate with firewalls. In some cases, it may be a simple option that is setable on the client program. In other cases, there will be instruction on how to configure your firewall to make it work.
?	Check with your firewall vendor to see if there is an update to handle the protocol. Most firewall vendors maintain a Web site with searchable content, and you can search for the protocol in question.
?	Check the firewall logs to see if there are reverse connections that are coming back and being denied. Possibly, you might have to use a protocol analyzer to try to determine what the protocol is up to.
?	Don't forget to consider that you may not want...

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IP Addressing and Subnetting Including IPv6

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