RE: Network routing issue

[Luesley, William]

>> In order to help testing, I have been asked to place a third machine
between
>> these two which will be capable of intercepting and modifying any
messages.

>> My initial plan was to have a device which could mimic both ends of the
>> connection (as I already have code to do this); with each connection
being
>> on a separate NIC, leading to a setup as shown below:
>>
>>          A ------------ C  C  ---------- B
>> 192.168.1.1    192.168.1.2  192.168.1.1   192.168.1.2
>>                    (eth0)  (eth1)

>> Can I use IP Tables, how?
>>
>> Or, am I on totally the wrong track?

>You're on the wrong track. C doesnt even need IP addresses, two 
>choices:

>- C as bridge and use ebtables (C doesnt even need addresses 
>theoretically)

>- C as router, use iptables. C needs one or more addresses which must 
>be different.

My problem is I need to modify the messages before passing them on.  As far
as I'm aware, bridges don't do that - but then I'm a newbie when it comes to
bridging!

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