Date: Mon, 03 Apr 2000 10:50:02 +0100 From: Brian Somers <brian@Awfulhak.org> To: "Ari Suutari" <ari@suutari.iki.fi> Cc: "Arun Sharma" <adsharma@sharmas.dhs.org>, freebsd-net@FreeBSD.ORG, brian@hak.lan.Awfulhak.org Subject: Re: kernel vs user level implementation of NAT Message-ID: <200004030950.KAA01581@hak.lan.Awfulhak.org> In-Reply-To: Message from "Ari Suutari" <ari@suutari.iki.fi> of "Mon, 03 Apr 2000 09:24:02 %2B0300." <006401bf9d35$37bddb00$0e05a8c0@intranet.syncrontech.com>
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> Hi,
>
>
> > Can someone point me to some discussion or literature on why *BSDs chose
> > to implement natd as a daemon as opposed to a kernel service ? I'm
> > particularly interested in the performance (latency) aspects of the issue.
> >
>
> The history goes something like this:
>
> Some years ago I had a cable modem connection at home. I had
> internal network with some hosts and a FreeBSD server machine
> (running 2.x if I remember correctly). I was looking for solutions how
> to get my internal machines to access internet with similar
> manner as ip masquerading in Linux (Couldn't use Linux, I'v
> always been fond of *BSD).
>
> Well, I found that Darren Reed's ipfilter didn't work with 2.x so
> that was out. Porting of it looked like too much effort at that time.
>
> Then I found out from somewhere that user mode ppp had
> nat features and took a look at it. Surprisingly all the functions
> necessary to do it were packaged to a few source files
> which I took into natd. These sources were written by Charles
> Mott and eventually ended into libalias library.
>
> There was also another similar program in the beginning,
> Brian Somer's masqd. I don't remeber any more why I decided
> to go along with natd - maybe both were at very early stage of
> development
> and I just had more time to play with natd. Anyway, Brian also
> contributed to natd.
I found out about natd around 2 days after starting masqd, so I
dropped it :*]
> What I found good about doing this in user process was the
> ease of debugging and testing of new versions.
>
> Ari S.
--
Brian <brian@Awfulhak.org> <brian@[uk.]FreeBSD.org>
<http://www.Awfulhak.org>; <brian@[uk.]OpenBSD.org>
Don't _EVER_ lose your sense of humour !
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