ip traffic redirection.

fred at bsdhost.net fred at bsdhost.net
Wed Jul 28 02:37:04 PDT 2004

Hello Matthew,

Thanks for your email. This looks like a good lead for what I need to 
Just one more question. Is there a user level bridge package on FreeBSD 


On Jul 28, 2004, at 10:50 AM, Matthew Seaman wrote:

> On Wed, Jul 28, 2004 at 10:23:28AM +0200, fred at bsdhost.net wrote:
>> This is maybe the wrong list for this question but anyway...
> No -- this is the right list for questions.
>> For a proof of concept I need to setup a gateway to divert certain 
>> kind
>> of ip traffic to a special program who do some counting and
>> modification on these packets and then re-inject them back. This has 
>> to
>> be a gateway and not a router.
> Yes, that's doable.  It sounds very much like transparent proxying.
> So long as you can select the traffic you want to process solely by
> examining the IP headers it should be easy.  Of course, the process
> you feed the selected packets to can do whatever it wants with them
> and can be programmed to decode packet payloads as required.
>> Does someone know if there is a package un the FreeBSD ports who can
>> help me do that? Can I do that using ipfw and in that case can someone
>> send me a pointer to some docs or examples ?
> What you want to do sounds very much like transparent proxying.  That
> can be implemented fairly simply under FreeBSD using, for example
> ipfw(8)'s 'fwd' mechanism.
> There's a nics discussion in the Squid FAQ which you should be able to
> mine for clues:
>     http://www.squid-cache.org/Doc/FAQ/FAQ-17.html
> 	Cheers,
> 	Matthew
> -- 
> Dr Matthew J Seaman MA, D.Phil.                       26 The Paddocks
>                                                       Savill Way
> PGP: http://www.infracaninophile.co.uk/pgpkey         Marlow
> Tel: +44 1628 476614                                  Bucks., SL7 1TH 
> UK

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