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 From:  "Thomas Siegenthaler" <thosi at thosi dot ch>
 To:  <m0n0wall at lists dot m0n0 dot ch>
 Subject:  PPTP issue (again)
 Date:  Sat, 9 Apr 2005 13:26:29 +0200 
Hallo
 
I have three computers in my LAN. Two are running Win2k and one is running
WinXP. 

Now, I can connect to a PPTP server in the internet from one of my three pcs
in my LAN. As soon as I established a connection, the other two pcs are not
able to connect to ANY PPTP SERVER trough the internet. But this pc, which I
used to establish the first connection (since m0n0wall started) can still
connect to any other server. 
 
After I reset the NAT state table, I can connect from another PC to the PPTP
server. But after this connect, the same problem occurs as before.
 
 
Anyone an idea how to solve this problem ? When I have a look to my sniffer
running on the client machine, it seems like the pptp server sends packets
to the client, but these packets never reach the client.
Please see the attachment. I added a sniffer export. 
 
 
 
Greetz
Thomas
No.     Time        Source                Destination           Protocol Info
     37 10.433501   192.168.222.5         213.XXX.YYY.ZZZ       TCP      3252 > pptp [SYN] Seq=0
Ack=0 Win=65535 Len=0 MSS=1460

Frame 37 (62 bytes on wire, 62 bytes captured)
Internet Protocol, Src Addr: 192.168.222.5 (192.168.222.5), Dst Addr: 213.XXX.YYY.ZZZ
(213.XXX.YYY.ZZZ)
Transmission Control Protocol, Src Port: 3252 (3252), Dst Port: pptp (1723), Seq: 0, Ack: 0, Len: 0

No.     Time        Source                Destination           Protocol Info
     39 10.467214   192.168.222.5         213.XXX.YYY.ZZZ       PPTP    
Start-Control-Connection-Request

Frame 39 (210 bytes on wire, 210 bytes captured)
Internet Protocol, Src Addr: 192.168.222.5 (192.168.222.5), Dst Addr: 213.XXX.YYY.ZZZ
(213.XXX.YYY.ZZZ)
Transmission Control Protocol, Src Port: 3252 (3252), Dst Port: pptp (1723), Seq: 1, Ack: 1, Len:
156
Point-to-Point Tunnelling Protocol

No.     Time        Source                Destination           Protocol Info
     41 10.517282   192.168.222.5         213.XXX.YYY.ZZZ       PPTP     Outgoing-Call-Request

Frame 41 (222 bytes on wire, 222 bytes captured)
Internet Protocol, Src Addr: 192.168.222.5 (192.168.222.5), Dst Addr: 213.XXX.YYY.ZZZ
(213.XXX.YYY.ZZZ)
Transmission Control Protocol, Src Port: 3252 (3252), Dst Port: pptp (1723), Seq: 157, Ack: 157,
Len: 168
Point-to-Point Tunnelling Protocol

No.     Time        Source                Destination           Protocol Info
     43 10.572637   192.168.222.5         213.XXX.YYY.ZZZ       PPTP     Set-Link-Info

Frame 43 (78 bytes on wire, 78 bytes captured)
Internet Protocol, Src Addr: 192.168.222.5 (192.168.222.5), Dst Addr: 213.XXX.YYY.ZZZ
(213.XXX.YYY.ZZZ)
Transmission Control Protocol, Src Port: 3252 (3252), Dst Port: pptp (1723), Seq: 325, Ack: 189,
Len: 24
Point-to-Point Tunnelling Protocol

No.     Time        Source                Destination           Protocol Info
     44 10.585437   192.168.222.5         213.XXX.YYY.ZZZ       PPP LCP  Configuration Request

Frame 44 (71 bytes on wire, 71 bytes captured)
Internet Protocol, Src Addr: 192.168.222.5 (192.168.222.5), Dst Addr: 213.XXX.YYY.ZZZ
(213.XXX.YYY.ZZZ)
Generic Routing Encapsulation (PPP)
Point-to-Point Protocol
PPP Link Control Protocol

No.     Time        Source                Destination           Protocol Info
     54 12.584544   192.168.222.5         213.XXX.YYY.ZZZ       PPP LCP  Configuration Request

Frame 54 (71 bytes on wire, 71 bytes captured)
Internet Protocol, Src Addr: 192.168.222.5 (192.168.222.5), Dst Addr: 213.XXX.YYY.ZZZ
(213.XXX.YYY.ZZZ)
Generic Routing Encapsulation (PPP)
Point-to-Point Protocol
PPP Link Control Protocol

No.     Time        Source                Destination           Protocol Info
     57 15.584518   192.168.222.5         213.XXX.YYY.ZZZ       PPP LCP  Configuration Request

Frame 57 (71 bytes on wire, 71 bytes captured)
Internet Protocol, Src Addr: 192.168.222.5 (192.168.222.5), Dst Addr: 213.XXX.YYY.ZZZ
(213.XXX.YYY.ZZZ)
Generic Routing Encapsulation (PPP)
Point-to-Point Protocol
PPP Link Control Protocol

No.     Time        Source                Destination           Protocol Info
     61 19.584511   192.168.222.5         213.XXX.YYY.ZZZ       PPP LCP  Configuration Request

Frame 61 (71 bytes on wire, 71 bytes captured)
Internet Protocol, Src Addr: 192.168.222.5 (192.168.222.5), Dst Addr: 213.XXX.YYY.ZZZ
(213.XXX.YYY.ZZZ)
Generic Routing Encapsulation (PPP)
Point-to-Point Protocol
PPP Link Control Protocol

No.     Time        Source                Destination           Protocol Info
     62 23.584535   192.168.222.5         213.XXX.YYY.ZZZ       PPP LCP  Configuration Request

Frame 62 (71 bytes on wire, 71 bytes captured)
Internet Protocol, Src Addr: 192.168.222.5 (192.168.222.5), Dst Addr: 213.XXX.YYY.ZZZ
(213.XXX.YYY.ZZZ)
Generic Routing Encapsulation (PPP)
Point-to-Point Protocol
PPP Link Control Protocol

No.     Time        Source                Destination           Protocol Info
    105 27.584469   192.168.222.5         213.XXX.YYY.ZZZ       PPP LCP  Configuration Request

Frame 105 (71 bytes on wire, 71 bytes captured)
Internet Protocol, Src Addr: 192.168.222.5 (192.168.222.5), Dst Addr: 213.XXX.YYY.ZZZ
(213.XXX.YYY.ZZZ)
Generic Routing Encapsulation (PPP)
Point-to-Point Protocol
PPP Link Control Protocol

No.     Time        Source                Destination           Protocol Info
    106 31.584434   192.168.222.5         213.XXX.YYY.ZZZ       PPP LCP  Configuration Request

Frame 106 (71 bytes on wire, 71 bytes captured)
Internet Protocol, Src Addr: 192.168.222.5 (192.168.222.5), Dst Addr: 213.XXX.YYY.ZZZ
(213.XXX.YYY.ZZZ)
Generic Routing Encapsulation (PPP)
Point-to-Point Protocol
PPP Link Control Protocol

No.     Time        Source                Destination           Protocol Info
    108 35.584419   192.168.222.5         213.XXX.YYY.ZZZ       PPP LCP  Configuration Request

Frame 108 (71 bytes on wire, 71 bytes captured)
Internet Protocol, Src Addr: 192.168.222.5 (192.168.222.5), Dst Addr: 213.XXX.YYY.ZZZ
(213.XXX.YYY.ZZZ)
Generic Routing Encapsulation (PPP)
Point-to-Point Protocol
PPP Link Control Protocol

No.     Time        Source                Destination           Protocol Info
    109 39.584419   192.168.222.5         213.XXX.YYY.ZZZ       PPP LCP  Configuration Request

Frame 109 (71 bytes on wire, 71 bytes captured)
Internet Protocol, Src Addr: 192.168.222.5 (192.168.222.5), Dst Addr: 213.XXX.YYY.ZZZ
(213.XXX.YYY.ZZZ)
Generic Routing Encapsulation (PPP)
Point-to-Point Protocol
PPP Link Control Protocol

No.     Time        Source                Destination           Protocol Info
    114 43.584378   192.168.222.5         213.XXX.YYY.ZZZ       PPP LCP  Configuration Request

Frame 114 (71 bytes on wire, 71 bytes captured)
Internet Protocol, Src Addr: 192.168.222.5 (192.168.222.5), Dst Addr: 213.XXX.YYY.ZZZ
(213.XXX.YYY.ZZZ)
Generic Routing Encapsulation (PPP)
Point-to-Point Protocol
PPP Link Control Protocol

No.     Time        Source                Destination           Protocol Info
    118 47.584600   192.168.222.5         213.XXX.YYY.ZZZ       PPTP     Call-Clear-Request

Frame 118 (70 bytes on wire, 70 bytes captured)
Internet Protocol, Src Addr: 192.168.222.5 (192.168.222.5), Dst Addr: 213.XXX.YYY.ZZZ
(213.XXX.YYY.ZZZ)
Transmission Control Protocol, Src Port: 3252 (3252), Dst Port: pptp (1723), Seq: 349, Ack: 189,
Len: 16
Point-to-Point Tunnelling Protocol

No.     Time        Source                Destination           Protocol Info
    120 47.628015   192.168.222.5         213.XXX.YYY.ZZZ       PPTP    
Stop-Control-Connection-Request

Frame 120 (70 bytes on wire, 70 bytes captured)
Internet Protocol, Src Addr: 192.168.222.5 (192.168.222.5), Dst Addr: 213.XXX.YYY.ZZZ
(213.XXX.YYY.ZZZ)
Transmission Control Protocol, Src Port: 3252 (3252), Dst Port: pptp (1723), Seq: 365, Ack: 337,
Len: 16
Point-to-Point Tunnelling Protocol

No.     Time        Source                Destination           Protocol Info
    122 47.657945   192.168.222.5         213.XXX.YYY.ZZZ       TCP      3252 > pptp [FIN, ACK]
Seq=381 Ack=353 Win=65183 [CHECKSUM INCORRECT] Len=0

Frame 122 (54 bytes on wire, 54 bytes captured)
Internet Protocol, Src Addr: 192.168.222.5 (192.168.222.5), Dst Addr: 213.XXX.YYY.ZZZ
(213.XXX.YYY.ZZZ)
Transmission Control Protocol, Src Port: 3252 (3252), Dst Port: pptp (1723), Seq: 381, Ack: 353,
Len: 0

No.     Time        Source                Destination           Protocol Info
    124 47.687940   192.168.222.5         213.XXX.YYY.ZZZ       TCP      3252 > pptp [ACK] Seq=382
Ack=354 Win=65183 [CHECKSUM INCORRECT] Len=0

Frame 124 (54 bytes on wire, 54 bytes captured)
Internet Protocol, Src Addr: 192.168.222.5 (192.168.222.5), Dst Addr: 213.XXX.YYY.ZZZ
(213.XXX.YYY.ZZZ)
Transmission Control Protocol, Src Port: 3252 (3252), Dst Port: pptp (1723), Seq: 382, Ack: 354,
Len: 0