Setting up a network and sharing internet

[Henry Spencer]

On Wed, 24 Aug 2005, James Knott wrote:
> One thing 10 Mb hubs are still useful for, is testing.  You can insert a
> computer running ethereal between a computer and switch.  The
> disadvantage is that you've now changed the connection to half duplex
> and possible also forced a 100 Mb or gigabit NIC to run at 10 Mb.

That can be avoided by giving the eavesdropping computer two Ethernets,
and setting it up to act as a bridge (so it doesn't have its own IP
addresses etc. to mess up the picture).  It can provide full duplex,
and at least a cheap imitation :-) of full speed, depending on how well
it can keep up.  Moreover, not only can it eavesdrop on the packets it's
relaying, but it can alter them as well, which is sometimes very useful.

                                                          Henry Spencer
                                                       henry-lqW1N6Cllo0sV2N9l4h3zg at public.gmane.org

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