[pptp-server] stateless encryption

[Josh Howlett]

Hi all,

I have a problem with MPPE 40-bit encryption.  It works for a couple 
of minutes, then seizes up.  The client is Windows 2000.  My set-up is 
Linux 2.4 with ppp-2.4.0 + all the latest patches from 
ftp://ftp.binarix.com/pub/ppp-mppe/

I have:

mppe-40
mppe-stateless

in my ppp options file, but I pppd starts up in none-stateless mode:

pppd 2.4.0 started by root, uid 0
Using interface ppp0
Connect: ppp0 <--> /dev/pts/1
MSCHAP-v2 peer authentication suceeded for *****
MPPE 40 bit, non-stateless compression enabled
found interface eth0 for proxy arp
local IP address ***********
remote IP address ***********
Protocol-Reject for unsupported protocol 0xa614
.............. etc etc.

I ran "tcpdump -a -i ppp0 -w /tmp/out", and parts of the traffic are
readable.  Could it be that the encryption isn't working somehow?  I 
have "require encryption" enabled on the Windows client, and the 
Windows machine seems to think that the connection is encrypted...

thanks, josh.

-------------------
Josh Howlett, Network Supervisor,
Networking and Digital Communications,
Information Services.
j.f.howlett at bris.ac.uk | 0117 9546895