Если включаем "Требовать шифрование" в виндеХР\2к - получаем отлуп.
Без "требования" соединение происходит, все нормально. MS-CHAP-v2 аутентификация.
Система: Suse Pro 9.1. Пакеты все из нее родимой.
Хотя:

#/var/log # cat pptpd.log

using channel 67
Using interface ppp0
Connect: ppp0 <--> /dev/pts/235
sent [LCP ConfReq id=0x1 <mru 1472> <asyncmap 0x0> <auth chap MS-v2> <magic 0x547eb437> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0x0 <mru 1400> <magic 0x24405b2> <pcomp> <accomp> <callback CBCP>]
sent [LCP ConfRej id=0x0 <callback CBCP>]
rcvd [LCP ConfReq id=0x1 <mru 1400> <magic 0x24405b2> <pcomp> <accomp>]
sent [LCP ConfAck id=0x1 <mru 1400> <magic 0x24405b2> <pcomp> <accomp>]
sent [LCP ConfReq id=0x1 <mru 1472> <asyncmap 0x0> <auth chap MS-v2> <magic 0x547eb437> <pcomp> <accomp>]
rcvd [LCP ConfAck id=0x1 <mru 1472> <asyncmap 0x0> <auth chap MS-v2> <magic 0x547eb437> <pcomp> <accomp>]
sent [LCP EchoReq id=0x0 magic=0x547eb437]
sent [CHAP Challenge id=0xed <382846e61ade57175bbfd2d108c265e3>, name = "xxx"]
rcvd [LCP code=0xc id=0x2 02 44 05 b2 4d 53 52 41 53 56 35 2e 31 30]
sent [LCP CodeRej id=0x2 0c 02 00 12 02 44 05 b2 4d 53 52 41 53 56 35 2e 31 30]
rcvd [LCP code=0xc id=0x3 02 44 05 b2 4d 53 52 41 53 2d 30 2d 4d 4f 52 50 48]
sent [LCP CodeRej id=0x3 0c 03 00 15 02 44 05 b2 4d 53 52 41 53 2d 30 2d 4d 4f 52 50 48]
rcvd [LCP EchoRep id=0x0 magic=0x24405b2]
rcvd [CHAP Response id=0xed <326145fa7074f1b0bcec0ac1c752500a00000000000000007e542d73a1bcc0187f9a8713aa58cb68b35e3d724bb91388
00>, name = "xxx"]
sent [CHAP Success id=0xed "S=29A10CAD4443EE05F7C2699097112B4A16179E33 M=Access granted"]
script /etc/ppp/auth-up started (pid 4528)
sent [IPCP ConfReq id=0x1 <addr 192.168.254.1>]
rcvd [CCP ConfReq id=0x4 <mppe +H +M +S +L -D +C>]
Unsupported protocol 'Compression Control Protocol' (0x80fd) received
sent [LCP ProtRej id=0x4 80 fd 01 04 00 0a 12 06 01 00 00 e1]
rcvd [IPCP ConfReq id=0x5 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-wins 0.0.0.0> <ms-dns3 0.0.0.0> <ms-wins 0.0.0.0>]
sent [IPCP ConfRej id=0x5 <ms-wins 0.0.0.0> <ms-wins 0.0.0.0>]
rcvd [IPCP ConfAck id=0x1 <addr 192.168.254.1>]
script /etc/ppp/auth-up finished (pid 4528), status = 0x0
rcvd [LCP TermReq id=0x6 02 44 05 b2 00 3c cd 74 00 00 02 e6]
LCP terminated by peer (^BD^EM-2^@<M-Mt^@^@^BM-f)
script /etc/ppp/auth-down started (pid 4532)
sent [LCP TermAck id=0x6]
Modem hangup
Connection terminated.
#

Хотя:
#cat /etc/ppp/options.pptp

logfile /var/log/pptpd.log
debug
mtu 1472
mru 1472
auth
require-mschap-v2
require-mppe
#mppe-stateless
ms-dns 192.168.207.5
192.168.254.1:
nobsdcomp
noccp
noendpoint
noipdefault
noipx
novj
receive-all
lock

И

# lsmod |grep mppe
ppp_mppe 16512 0
ppp_generic 32020 2 ppp_mppe,ppp_async
#

#mppe-stateless - вообще пишет что неверная опция(если раскомментить)

• VPN и шифрование, Myau, 15:57 , 15-Окт-05, (1)