[pptp-server] PPTP behind firewall

[Ducati]

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Can someone help me as far as setting up a pptp client, Linux BTW,
behind a firewall, also Linux.  I would like to access a NT Server at
work from home and have a @Home cable connection with a 2.0.36
masquerading firewall so I can use my laptop from home.  I have seem
some things on IP port 137 and udp port 17, from memory.  Anyone got a
FAQ or mini-HOWTO?

Thanks,

Rod