VPN and IPSec

Salzman, Noah Noah_Salzman at NAI.COM
Fri Feb 11 18:09:31 EST 2000


Hello Santanu,

In regards to the source code question:

You can download the FULL source code to PGP 6.5.1 from http://www.pgpi.com
(a site that is not truly affiliated with PGP Security Inc, but is the
current de facto location to acquire the source).

The exact link to the PGP 6.5.1 source is:
http://www.pgpi.org/cgi/download.cgi?filename=pgp651i-win-src.zip

PGP 6.5.1 is many things, but the PGPnet component in it is a full fledged
IPsec client for Windows 95, 98, NT4 and Mac OS.  The current version of the
shipping product is 6.5.3 and if you actually want to use PGP on a regular
basis you should use 6.5.3.  (Please note that the source to 6.5.3 has not
been published at this date.)

In regards to the general question about VPN clients:

The most common use of a VPN client on a desktop or portable PC is to
establish a secure connection -- through a generic ISP -- to a secure
server, firewall, or gateway.  Some VPN clients -- such as PGP 6.5.x <grin>
-- allow you to establish peer-to-peer IPsec connections between any two
PCs... but by far the former example is the primary use of this technology.

  Noah Salzman
     noah at pgp.com
     408.346.5186



-----Original Message-----
From: De, Santanu* (SDE) [mailto:SDE at ARINC.COM]
Sent: Thursday, February 10, 2000 1:44 PM
To: VPN at SECURITYFOCUS.COM
Subject: VPN and IPSec


Hi,

I have been subscribing to this email mailing list for quite a while now. I
am really interested in the VPN stuff. Though I'd admit I have never laid a
hand on any of the related products.
I work in networking stuff.. ISO -OSI standard- HDLC and all.. though I was
never in TCP/IP suite of protocols. Nevertheless, I never miss any article
or interesting white paper that I come across.
I understand that IPSec is a pretty new technology around for a couple of
years or less. I was told that IPSec is implemented in Win2K. Some of the
routers have also come with IPSec implemented.
May I know what is a VPN client after all? I understand that routers that
are IPSec enabled give the network administrators the privilege to decide
which packets are to be tunneled and which not to be.
I presume VPN clients are software which gives the user this privilege to
decide. Am I right? Could one elaborate how these VPN clients work after
all.
I also want to know that how IPSec or other newer protocols are implemented
in systems where the OS is not IPSec enabled as such. Could one tell me how
the BITS and BITW implementations are done? Could I have an access to some
open source code for my interests?

Regards,
Santanu.

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