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Hello,

I'm quite new to masquerading and trying to learn more about it to be
able to use it in my work. My problem is related to using UDP
protocol and masquerading.

If I have understood correctly, the way masquerading is working is
that it uses a new port number (in the external interface) for each
outgoing UDP packet. Am I right?

However, I would need that port number to remain
same with every packet coming from the same host in the internal
network, that is, to create a UDP pipe connecting an internal host to
a certain port in the external interface. This pipe should time out
after certain time of silence. In addition, the internal IP-addresses
are dynamically assigned and are actually changing quite frequently.

I would like to ask whether there is some handy mechanism for doing
this using masquerading and/or portforwarding? Or would some other 
tools be better? I
would also greatly appreaciate if someone could give me some pointers
about where to find general information about how masquerading has
been implemented (besides source code) and how it's working. I've
checked mailing list archives and ipmasq homepage, but they seem to
concentrate on how to get different applications to work, not the
philosophy behind it.

Thank you,
klaus

Klaus Anderson,
NVO/NBD
[EMAIL PROTECTED]
+358 50 3207683

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