Date: Sun, 6 Jan 2002 11:06:44 -0800 From: "Crist J. Clark" <cristjc@earthlink.net> To: Dean Hollister <dean@odyssey.apana.org.au> Cc: questions@freebsd.org Subject: Re: ipfw question Message-ID: <20020106110643.A237@gohan.cjclark.org> In-Reply-To: <20020106113530.R85470-100000@odyssey.apana.org.au>; from dean@odyssey.apana.org.au on Sun, Jan 06, 2002 at 11:36:40AM %2B0800 References: <20020105184641.G204@gohan.cjclark.org> <20020106113530.R85470-100000@odyssey.apana.org.au>
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On Sun, Jan 06, 2002 at 11:36:40AM +0800, Dean Hollister wrote:
> On Sat, 5 Jan 2002, Crist J. Clark wrote:
>
> > > I need to divert any outgoing packet on port 100 to any host over to the
> > > same port on machine B.
> >
> > # ipfw add fwd 2.2.2.2 from 1.1.1.1 to any 100 out
> >
> > Should do it, provided,
> >
> > 1) 2.2.2.2 is local to 1.1.1.1
>
> On the same LAN in other words?
Yes.
> > 2) This is _really_ what you want to do. You do realize that the
> > fwd'ed packet is NOT modified. Machine B will receive a datagram
> > without the destination address changed in any way (if 1.1.1.1 was
> > sending a datagram to 3.3.3.3, port 100, Machine B will receive a
> > datagram with a destination address of 3.3.3.3, port 100).
>
> That's fine - I need the destination address to receive the correct origin
> address.
NAT doesn't change the origin, it changes the desitnation. In this
case, it would change the destination address to 2.2.2.2 rather than
3.3.3.3.
> > As I think I said before, you probably actually want to do NAT of some
> > sort.
>
> NAT changes the origin.
Destination.
--
"It's always funny until someone gets hurt. Then it's hilarious."
Crist J. Clark | cjclark@alum.mit.edu
| cjclark@jhu.edu
http://people.freebsd.org/~cjc/ | cjc@freebsd.org
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