From owner-freebsd-hackers  Fri Jun  1  3:55:11 2001
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From: Urban Olsson <Urban.E.Olsson@telia.se>
To: Bjoern Fischer <bfischer@Techfak.Uni-Bielefeld.DE>,
	Urban Olsson <Urban.E.Olsson@telia.se>
Cc: freebsd-hackers@FreeBSD.ORG
Subject: RE: modified FreeBSD gateway
Date: Fri, 1 Jun 2001 12:54:43 +0200 
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Hi again,

What I have done so far is to use the natd daemon as an example but I =
have a
problem. The divert seems to work but the problem is that I can=B4t get =
the
packets in my userspace program. Is there some specific port that I =
should
use for the divert socket? This is not very clear in the natd code. I =
can=B4t
find where the port is set and if it is a special port reserved for the
divert sockets.

<< Urban

> -----Original Message-----
> From: Bjoern Fischer [mailto:bfischer@Techfak.Uni-Bielefeld.DE]
> Sent: Thursday, May 24, 2001 3:31 PM
> To: Urban Olsson
> Cc: freebsd-hackers@FreeBSD.ORG
> Subject: Re: modified FreeBSD gateway
>=20
>=20
> Hello Urban,
>=20
> > I have a question regarding modification of a FreeBSD=20
> gateway (the Internet
> > gateway for a LAN). What I want to do is to have the=20
> gateway pick up the
> > packets, modify the IP-header and resend the packet onto=20
> the network. This
> > is a little bit like a NAT but I want to be able to do it=20
> differently and on
> > my own terms. I guess that this means that I would be=20
> forced to rewrite the
> > gateway source-code so it behaves as I want it to.
>=20
> You can do this entirely in userspace. All you need is a=20
> divert socket.
> See the manpage divert(4).
>=20
>   Bj=F6rn Fischer
>=20
> --=20
> -----BEGIN GEEK CODE BLOCK-----
> GCS d--(+) s++: a- C+++(-) UB++++OSI++++$ P+++(-) L---(++) !E=20
> W- N+ o>+
> K- !w !O !M !V  PS++  PE-  PGP++  t+++  !5 X++ tv- b+++ D++ G=20
> e+ h-- y+=20
> ------END GEEK CODE BLOCK------
>=20

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