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Well this a weird firewall. Dot put your Windwows XP box to close to it, because it will go down...
Some good documents regarding TCP/IP for linux can be found all over the web, but how to access it when you cant connect?
IPSec is a suite of protocols for securing network connections, but the details and many variations quickly become overwhelming. This is particularly the case when trying to interoperate between disparate systems, causing more than one engineer to just mindlessly turn the knobs when attempting to bring up a new connection.
I used to be a [netmaster] but nowadays I'm not into TCP/IP anymore, still TCP/IP Tutorial and Technical Overview is a good read for those who want to bluff their way into the internet.