Hello all,
first time on this forum, I hope I can be of assistance to some of you guys too.
My first post however, will be a problem of my own
Situation:
- wireless GPRS modem with a working Internet connection situated in Jordan.
- connected to the GPRS modem: a WinXP PC with VNC server (UltraVNC) installed.
- WinXP PC with Cable Internet Connection situated in The Netherlands.
Goal:
- to take over the WinXP PC using a VNC connection form the The Netherlands to control te WInXP PC situated in Jordan. We always connect FROM the Netherlands TO the GPRS modem in Jordan.
The Problem:
- establishing the VNC connection using a cable connection.
The 'funny' thing is: VNC connection WORKS with a T1 fibre connection. With a CABLE connection however, the connection fails.
We tried various connection types: ADSL, CABLE (we tried various ISP's and operating systems!) but only the Fibre connection works. These test were done using the same pc (and some others pc's but this made no difference).
Speed should not be the issue here, because the GPRS modem clearly is the bottleneck.
Below are 2 dumps made using WireShark.
We deleted the Ip adresses from the dump and changed them to "Client" and "Server" for security reasons..
The first one is made with the WORKING connection. (WinXP->100MbitLan->T1 fibre connection->...)
The second dump is made using a CABLE connection.
(WinXP->100MbitLan->Cable connection->...)
As you can see, this connection is not established correctly...
[code:1:f1f3b5c4b4]
Time Source Destination Protocol Info
29.221180 Client Server TCP 4764 > 5900 [SYN] Seq=0 Len=0 MSS=1460
31.071030 Server Client TCP 5900 > 4764 [SYN, ACK] Seq=0 Ack=1 Win=65535 Len=0 MSS=1460
31.071094 Client Server TCP 4764 > 5900 [ACK] Seq=1 Ack=1 Win=65535 Len=0
31.920577 Server Client VNC Server protocol version: 003.006
31.920750 Client Server VNC Client protocol version: 003.003
Time Source Destination Protocol Info
5.434876 Client Server TCP 1469 > 5900 [SYN] Seq=0 Len=0 MSS=1460
7.729111 Server Client TCP 5900 > 1469 [SYN, ACK] Seq=0 Ack=1 Win=8760 Len=0 MSS=1460
7.729172 Client Server TCP 1469 > 5900 [ACK] Seq=1 Ack=1 Win=65535 Len=0
10.524501 Server Client TCP 5900 > 1469 [SYN, ACK] Seq=0 Ack=1 Win=8760 Len=0 MSS=1460
10.524550 Client Server TCP [TCP Dup ACK 10#1] 1469 > 5900 [ACK] Seq=1 Ack=1 Win=65535 Len=0
16.541817 Server Client TCP 5900 > 1469 [SYN, ACK] Seq=0 Ack=1 Win=8760 Len=0 MSS=1460
16.541870 Client Server TCP [TCP Dup ACK 10#2] 1469 > 5900 [ACK] Seq=1 Ack=1 Win=65535 Len=0
28.576874 Server Client TCP 5900 > 1469 [SYN, ACK] Seq=0 Ack=1 Win=8760 Len=0 MSS=1460
28.576922 Client Server TCP [TCP Dup ACK 10#3] 1469 > 5900 [ACK] Seq=1 Ack=1 Win=65535 Len=0
52.672502 Server Client TCP 5900 > 1469 [SYN, ACK] Seq=0 Ack=1 Win=8760 Len=0 MSS=1460
52.672554 Client Server TCP [TCP Dup ACK 10#4] 1469 > 5900 [ACK] Seq=1 Ack=1 Win=65535 Len=0
82.548013 Server Client TCP 5900 > 1469 [RST] Seq=1 Len=0
[/code:1:f1f3b5c4b4]
We did so much testing at this point, and we are out of ideas. I hope you guys can have a look and maybe give us some hints on where to look for the problem..
Muchos Thanks in advance.
first time on this forum, I hope I can be of assistance to some of you guys too.
My first post however, will be a problem of my own
Situation:
- wireless GPRS modem with a working Internet connection situated in Jordan.
- connected to the GPRS modem: a WinXP PC with VNC server (UltraVNC) installed.
- WinXP PC with Cable Internet Connection situated in The Netherlands.
Goal:
- to take over the WinXP PC using a VNC connection form the The Netherlands to control te WInXP PC situated in Jordan. We always connect FROM the Netherlands TO the GPRS modem in Jordan.
The Problem:
- establishing the VNC connection using a cable connection.
The 'funny' thing is: VNC connection WORKS with a T1 fibre connection. With a CABLE connection however, the connection fails.
We tried various connection types: ADSL, CABLE (we tried various ISP's and operating systems!) but only the Fibre connection works. These test were done using the same pc (and some others pc's but this made no difference).
Speed should not be the issue here, because the GPRS modem clearly is the bottleneck.
Below are 2 dumps made using WireShark.
We deleted the Ip adresses from the dump and changed them to "Client" and "Server" for security reasons..
The first one is made with the WORKING connection. (WinXP->100MbitLan->T1 fibre connection->...)
The second dump is made using a CABLE connection.
(WinXP->100MbitLan->Cable connection->...)
As you can see, this connection is not established correctly...
[code:1:f1f3b5c4b4]
Time Source Destination Protocol Info
29.221180 Client Server TCP 4764 > 5900 [SYN] Seq=0 Len=0 MSS=1460
31.071030 Server Client TCP 5900 > 4764 [SYN, ACK] Seq=0 Ack=1 Win=65535 Len=0 MSS=1460
31.071094 Client Server TCP 4764 > 5900 [ACK] Seq=1 Ack=1 Win=65535 Len=0
31.920577 Server Client VNC Server protocol version: 003.006
31.920750 Client Server VNC Client protocol version: 003.003
Time Source Destination Protocol Info
5.434876 Client Server TCP 1469 > 5900 [SYN] Seq=0 Len=0 MSS=1460
7.729111 Server Client TCP 5900 > 1469 [SYN, ACK] Seq=0 Ack=1 Win=8760 Len=0 MSS=1460
7.729172 Client Server TCP 1469 > 5900 [ACK] Seq=1 Ack=1 Win=65535 Len=0
10.524501 Server Client TCP 5900 > 1469 [SYN, ACK] Seq=0 Ack=1 Win=8760 Len=0 MSS=1460
10.524550 Client Server TCP [TCP Dup ACK 10#1] 1469 > 5900 [ACK] Seq=1 Ack=1 Win=65535 Len=0
16.541817 Server Client TCP 5900 > 1469 [SYN, ACK] Seq=0 Ack=1 Win=8760 Len=0 MSS=1460
16.541870 Client Server TCP [TCP Dup ACK 10#2] 1469 > 5900 [ACK] Seq=1 Ack=1 Win=65535 Len=0
28.576874 Server Client TCP 5900 > 1469 [SYN, ACK] Seq=0 Ack=1 Win=8760 Len=0 MSS=1460
28.576922 Client Server TCP [TCP Dup ACK 10#3] 1469 > 5900 [ACK] Seq=1 Ack=1 Win=65535 Len=0
52.672502 Server Client TCP 5900 > 1469 [SYN, ACK] Seq=0 Ack=1 Win=8760 Len=0 MSS=1460
52.672554 Client Server TCP [TCP Dup ACK 10#4] 1469 > 5900 [ACK] Seq=1 Ack=1 Win=65535 Len=0
82.548013 Server Client TCP 5900 > 1469 [RST] Seq=1 Len=0
[/code:1:f1f3b5c4b4]
We did so much testing at this point, and we are out of ideas. I hope you guys can have a look and maybe give us some hints on where to look for the problem..
Muchos Thanks in advance.