[pptp-server] Unsupported protocol (0xxxx ) received

[Sergio Dominguez]

Hello fellow listers:

 I have setup a PPTP server, it has a public IP address configured:
A.B.C.2, and
a private IP address: 172.23.1.1 also ( it's connected to the 172.23.1.0
network).

  From a windows 98 workstation, I have successfully stablished a VPN
link
across internet, but I can not access the private network.

  If  I make a
  C:\WINDOWS\PING 172.23.1.1
  I receive no response in the client.

 Looking at the pptpd.log file, the following messages are displayed
everytime
I do a ping:

 Feb  2 12:36:24 vpn pppd[6266]: rcvd [proto=0x8072] a1 7a 2f 68 bb 27
97 08 a7 25 14 39 23 5d 17 87 4e 68 38 3f f6 cb b7 30 fc 47 64 ef 38 8f
f3 5b ...

Feb  2 12:36:24 vpn pppd[6266]: Unsupported protocol (0x8072) received

Feb  2 12:36:24 vpn pppd[6266]: sent [LCP ProtRej id=0x21 80 72 a1 7a 2f
68 bb 27 97 08 a7 25 14 39 23 5d 17 87 4e 68 38 3f f6 cb b7 30 fc 47 64
ef 38 8f f3 5b 82 c0 87 4a f6 f6 c5 8f 5a 49 26 77 66 84 19 dd 73 c4 38
0b 91 63 fb d2 4b 74 75 1f]


Extra info:

 My pptpd.conf file is:

speed 115200
localip 172.23.1.50-149
remoteip 172.23.1.150-249

 In the process list I can se the following:
6265 ?        S      0:00 pptpd
[internet_address_of_windows_client_machine]
6266 ?        S      0:00 /usr/sbin/pppd local 115200
172.23.1.51:172.23.1.151

Routing table at the server side:

[root at vpn log]# route
Kernel IP routing table
Destination         Gateway              Genmask         Flags Metric
Ref    Use Iface
172.23.1.151          *              255.255.255.255  UH    0
0         0  ppp0
A.B.C.2                  *               255.255.255.255  UH    0
0         0  eth0
A.B.C.0                  *               255.255.255.224  U       0
0         0  eth0
172.23.1.0              *               255.255.255.0      U
0      0         0  eth0
127.0.0.0                *               255.0.0.0              U
0      0         0  lo
default             A.B.C.1           0.0.0.0                  UG
0      0         0  eth0

Any help will be highly apreciatted.