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List:       ipfilter
Subject:    Re: Bugs (?) in v3.1.0 on FreeBSD v2.1R
From:       Michael Ryan <mike () NetworX ! ie>
Date:       1996-09-26 15:24:33
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On Thu, 26 Sep 1996 07:18:18 -0600 Warner Losh wrote:

> Darren Reed writes: 
> : >  8. How does FTP work in the NAT scenario?  I see a directory for FWTK
> : >     which contains the file ftp-gw.diff.  As there's no documentation
> : >     re this problem, do I just patch these diffs into the fwtk
> : >     ftp-gw.c file?
> : 
> : TCP applications and NAT are a bad mix and as yet, I've yet to hear of
> : it being done properly.
> 
> The basic reason for this is that many TCP protocols encode either the
> underlying TCP address (eg irc), some port number (eg real audio) or
> both (eg talk or ftp).  And there is generally know way to know where
> those elemenets will occur in the protocol stream...
> 
> TIA, Slirp and all of them have exactly the same problem, for exactly
> the same reasons :-(.

Thanks.  Passive FTP works fine, so I can config my internal FTP clients
to use this (at least for interacting with servers that support it).


Bye,
Mike
<mike@NetworX.ie>
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