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Re: PPTP with Encryption



On Tue, Apr 30, 2002 at 12:03:09PM -0400, Derek J. Balling wrote:
> >I don't think you should have any patching to do. :) The home page
> >for poptop is at http://www.poptop.org.
> Not unless the packaged pptpd/ppp has something else, from the poptop.org 
> page:
> # Available PPPD patch allows Windows compatible encryption and 
> authentication (MSCHAPv2 and MPPE 40-128 bit RC4 encryption)

You're right.. (I guess you do want to encrypt to a Windows box, so
make sure you're using full strength RC4.. 40 bit keys can be brute
forced).

According to the poptop FAQ:
3.0 PPP (and MSCHAPv2/MPPE) Installation

It is only necessary to use PPP 2.3.8 if you want Microsoft compatible
MSCHAPv2/MPPE authentication and encryption. The reason for this is that
the MSCHAPv2/MPPE patch currently supplied (19990813) is against PPP
2.3.8. If you don't need Microsoft compatible authentication/encryption
any 2.3.x PPP source will be fine.

[...]

The instructions look like you need to make a kernel module. 

> So it seems like theres SOMETHING I need to add to pppd to get 
> encryption to work with it, and (from my reading) it seems like 
> there's a patch that also needs to go in the kernel to make that pppd 
> change work as well.

Out of curiousity, why PPTP? Why not IPSec? There's better compatibility
with IPSec (FreeSWAN), and it looks like poptop hasn't been updated in a
long time (since 1999). Also, Win2K and I think (don't quote me on this)
WinXP have builtin IPSec support.

-Anne
-- 

              .-"".__."``".   Anne Carasik, System Administrator
 .-.--. _...' (/)   (/)   ``'   gator@cacr.caltech.edu 
(O/ O) \-'      ` -="""=.    ',  Center for Advanced Computing Research    
~`~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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