[pptp-server] PPTP crypto and management Problems

[Alessandro Iob]

Two questions:

1 -

I patched ppp-2.3.8 with the MPPE patch and the RC4 sources from
OpenSSL-0.9.3a distribution, recompiled the kernel and all the other
things.
When I connect to the pptpd linux server with "Require encrypted data"
option enabled I get a sequence of errors like the ones below (for each
transmitted packet,I suppose).
The server works fine with no data encryption.

Jul 19 09:41:00 fw pppd[1517]: Unsupported protocol (0x30d) received
Jul 19 09:41:00 fw pppd[1517]: sent [LCP ProtRej id=0xe 03 0d df f5 e4
78 38 4e
8d 66 3f c8 f0 e2 f8 ef cb f1 c5 00 13 45 5b 3f 40 d5 22 63 bd c8 6d 1c
b1 e4 77
 01 11 5d 51 4c 0a 0e c5 0c d7 93 58 b5 b7 de d3 27 99 36 89 e3 78 d5 47
71 44 b
c a8 75 2d f8 16 df b4 86 c2 31 75 ab c9 f3 f8
Jul 19 09:41:00 fw pppd[1517]: rcvd [proto=0x82e7] 22 71 6d 16 1f 9d 3b
02 13 a3
 ae bd 3f c9 d9 5b b4 b9 b0 40 a1 31 11 e1 82 71 6a b5 e9 9b f6 ad ...
Jul 19 09:41:00 fw pppd[1517]: Unsupported protocol (0x82e7) received
Jul 19 09:41:00 fw pppd[1517]: sent [LCP ProtRej id=0xf 82 e7 22 71 6d
16 1f 9d
3b 02 13 a3 ae bd 3f c9 d9 5b b4 b9 b0 40 a1 31 11 e1 82 71 6a b5 e9 9b
f6 ad c9
 40 51 1a 9a 90 ff 98 3f b3 f4 23 9a e5 7a f7 34 b5 aa a7 86 2b 4e 36 e4
b9 65 7
c df fc fa 7c c0 54 ce 96 dc c8 64 be 12 43 e4
Jul 19 09:41:00 fw kernel: ip_fw_demasq_gre(): Inbound from
194.21.179.133 has n
o masq table entry.

My ppp options file is:

name 194.21.179.140
ms-dns 192.168.0.1

lock
local
debug
auth
require-chap

#proxyarp
hide-password
noipx
lcp-echo-interval 30
lcp-echo-failure 4
asyncmap 0

+chap
+chapms
+chapms-v2
mppe-40
mppe-128
mppe-stateless

Any suggestion?

2 -

How can I assign fixed IP addresses to PPTP clients?



Thank You

Alessandro Iob
alex at nauta.it