Socket Bind(virtual IP) LocalEndpoint

15 Feb 2006 10:47 AM

Jonathan Woods

Please find file for illustrating infrastructure -->
http://test.thipparath.com/GPRS/GPRS.jpg Gateway receives packets from
Trucks for processing Route/GPS position. When Truck and Gateway
communicate in leased line, Gateway identifies different IP sent by
different truck. Where communicate over internet, NAT Server is used
for sending packets from different Trucks. Here is come to a problem
that Gateway unable to create individual Truck Session for tracking for
each truck GPS position because every packet received from internet is
Same IP address.

Hence, I would like to simulate NAT reverse translation function
(separate source IP in Packets to different IP according to data in
Packet). I decided to develop C# sockets offered in .NET framework. My
application will play 2 roles â€“ 1) Act Server to listen inbound
packet from internet, 2) Act Client to forward captured packet to
Gateway with different IP as the following flows:

1)    Create Asynchronous Socket for Listening
2)    Reading data by Accepted Socket instance, analyze data ( data
contain SIM No for key ), Lookup Table in Database or Generate virtual
IP
3)    Forward data with Different virtual IP

Problem Section (Sending data to Gateway)

// I want to generate virtual IP
IPAddress ipHostAddress = IPAddress.Parse(â€œ192.XX.XX.XXXâ€);
IPEndPoint localEndPoint = new IPEndPoint(ipHostAddress,0);

Socket sender = new Socket(AddressFamily.InterNetwork,
   SocketType.Stream,
                           ProtocolType.Tcp);

sender.Bind(localEndPoint); // ïƒŸ I canâ€™t bind virtual IP
// ( Requsted address invalid in it context ) Socket Exception thrown
sender.Connect(remoteEndPoint);

I sincerely would like to know yours idea in the scenario like this. Is
there any other ways? Thanks in advance.

15 Feb 2006 2:47 PM

DWS

Whats with that jpg that didn't download? Not a good business solution IPv6
is just around the corner your solution looks like it will break. You could
do everything over web as is. Give each truck a digital certificate and
identify by encrypted packed something that can grow and address the needs of
the business. If you can decrypt whats sent to it then it came from one of
your trucks. You can drop the expense for leased line and also let the
driver communicate with their family securely using the same certificate via
the company server. Stop by the truck stop and listen to the wi-fi.

Show quote

"Jonathan Woods" wrote:

> Please find file for illustrating infrastructure -->
> http://test.thipparath.com/GPRS/GPRS.jpg Gateway receives packets from
> Trucks for processing Route/GPS position. When Truck and Gateway
> communicate in leased line, Gateway identifies different IP sent by
> different truck. Where communicate over internet, NAT Server is used
> for sending packets from different Trucks. Here is come to a problem
> that Gateway unable to create individual Truck Session for tracking for
> each truck GPS position because every packet received from internet is
> Same IP address.
>
> Hence, I would like to simulate NAT reverse translation function
> (separate source IP in Packets to different IP according to data in
> Packet). I decided to develop C# sockets offered in .NET framework. My
> application will play 2 roles â€“ 1) Act Server to listen inbound
> packet from internet, 2) Act Client to forward captured packet to
> Gateway with different IP as the following flows:
>
> 1)    Create Asynchronous Socket for Listening
> 2)    Reading data by Accepted Socket instance, analyze data ( data
> contain SIM No for key ), Lookup Table in Database or Generate virtual
> IP
> 3)    Forward data with Different virtual IP
>
> Problem Section (Sending data to Gateway)
>
> // I want to generate virtual IP
> IPAddress ipHostAddress = IPAddress.Parse(â€œ192.XX.XX.XXXâ€);
> IPEndPoint localEndPoint = new IPEndPoint(ipHostAddress,0);
>
> Socket sender = new Socket(AddressFamily.InterNetwork,
>    SocketType.Stream,
>                            ProtocolType.Tcp);
>
> sender.Bind(localEndPoint); // ïƒŸ I canâ€™t bind virtual IP
> // ( Requsted address invalid in it context ) Socket Exception thrown
> sender.Connect(remoteEndPoint);
>
>
> I sincerely would like to know yours idea in the scenario like this. Is
> there any other ways? Thanks in advance.
>
>