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From: "JJB" <Barbish3@adelphia.net>
To: <jan.muenther@nruns.com>
Date: Mon, 2 Feb 2004 11:51:26 -0500
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cc: Jorn Argelo <jorn@wcborstel.nl>
cc: questions@freebsd.org
Subject: RE: proxies and firewalls
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Thanks for your reply, But I must be thick headed this morning,
because what you say below makes no sense to me.
I checked out the 2 referenced descriptions and they say
nothing about doing nat.

I have Lan with private ip address that send packets to
public internet. How does an proxy server solve the private ip
address versus my public ip address problem?

-----Original Message-----
From: owner-freebsd-questions@freebsd.org
[mailto:owner-freebsd-questions@freebsd.org]On Behalf Of
jan.muenther@nruns.com
Sent: Monday, February 02, 2004 11:28 AM
To: JJB
Cc: Jorn Argelo; questions@freebsd.org
Subject: Re: proxies and firewalls

> Are you saying you know of an proxy server that does the nat
> function?

Actually, the point of having  proxies is *not* having
to route. Your proxy machine should not be able to forward packets.

Roughly, there a two different sub-groups: Circuit layer and
application
layer proxies, names should be self explaining.

Example for an app layer gateway:

Port:   fwtk-2.1
Path:   /usr/ports/security/fwtk
Info:   A toolkit used for building firewalls based on proxy
services


Example for a circuit level proxy:

Port:   nylon-1.2
Path:   /usr/ports/net/nylon
Info:   A Unix SOCKS 4 and 5 proxy server


Socks5 is already app layer, too, IIRC.

Cheers, J.


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