[ale] pptp and ppp continued

Bao Ha baoh at linuxwizardry.com
Wed Jan 17 10:42:29 EST 2001



mppe is actually an implementaion of Micrsoft encryption
solution.  PPP uses it to support Microsoft's RAS serevrs.
It should already in the PPP source tree, at least since
2.3.7 I think.

PPTP is a different package.  It uses PPP to tunnel its
communication streams, and takes advantages of mppe if
configured.

May be the following example will be somewhat clearer.  You
will need PPP with CHAT/MS-CHATv1,v2 and MPPE 40/128 bit
encryption to talk to an NT RAS.  No VPN!  Just to be dialing
into some purposely secure setup with RC4 (mppe) encryption, as
recommended by Microsoft, configured by brain-dead MCSEs.

If you have access to a Win2K system, you can turn things
off and on with the advanced setup to see what the NT RAS
server wants.  Or you can load your option file with the
following goodies:
+chapms
+chapms-v2
mppe-40
mppe-128
mppe-stateless

You still need PPTP add-on to establish a VPN tunnel.  And
VPN could be un-encrypted, or 40/128 bit encryption if mppe
is turned on.

RC4 algorithm is owned by RSA Data Security.  Your PPP package
may not have MPPE due to the US export/import regulation.

More confused!  Wait until I am babling about IPSec!

Bao

-----Original Message-----
From: owner-ale at ale.org [mailto:owner-ale at ale.org]On Behalf Of Wandered
To: ale at ale.org
Inn
Sent: Wednesday, January 17, 2001 8:08 AM
To: ALE
Subject: [ale] pptp and ppp continued


I've been searching for information on pptp and ppp and found some
confusing information.

There are a large number of references to ppp-2.3.? and mppe (Microsoft
point to point support), yet I find no references to mppe and
ppp-2.4.0.  Also, there's absolutely no mention of mppe in the source
tree of ppp-2.4.0.

Has anyone else attempted to get pptp support into a version of ppp that
is later then 2.3.? ?

--
Until later: Geoffrey		esoteric at denali.atlnet.com

"Great spirits have always found violent opposition from mediocre minds.
The
latter cannot understand it when a man does not thoughtlessly submit to
hereditary prejudices but honestly and courageously uses his
intelligence."
- Albert Einstein
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