ip over ip tunneling

[Gregory Nowak]

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Hi all.

Is anyone here familiar with how to setup ip over ip tunneling with a
2.4.26, and eventually with a 2.6.x kernel? The documentation on the
subject is very scant, however, I managed to locate the following:

http://www.javacommerce.com/tips/linux/all/00000175.html

http://snafu.freedom.org/linux2.2/tunnel-notes.html

http://www.uwsg.iu.edu/hypermail/linux/net/0301.2/0002.html

Out of all of these, most deal with linux 2.0, or 2.2, which is
incorrect info when using linux 2.4, since there is only the one ipip
module in linux 2.4 now, and the configuration seems to be different
as far as I can tell. The second URL seems to be the most
informative. However, the fact that the person is using 192.168 IP
addresses for both the private and public addresses is very confusing
to me, and I eventually lose track of which is which. Also, this
person is seemingly showing how to setup a circular 2-way tunnel
between 3 or 4 machines, which is too advanced from what I'm looking
for. This makes it difficult for me to determine which portions of the
advanced example I want for my setup, not to mention that I find the
advanced setup example confusing as well.

Ok, now that I've described all my problems, let me describe what it
is that I want out of ipip. Simply put, I have 2 machines, machine a,
and machine b. For my purposes, machine a is the client, machine b is
the server. What I want is to have a 1-way tunnel, through which
machine a would make only out-bound connections, using its tunnel to
machine b, thus making it appear that the connections are coming from
machine b's network. 

Can someone who is familiar with ip over ip describe for me what
configuration steps I need to take on the client and server for my
specific situation as described above? Also, please use different IP
ranges (E.G. 172.16.x.x, and 192.168.x.x, where the 172 range would be
the public addresses, and the 192 range would be the private addresses
used in the tunnel) to make your explanation easier to understand?
Thanks in advance.

Greg


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