Databases
StackOverflow2013
Postsdbo
POTCP Echo on different adapter
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POTCP Echo on different adapter
    primarykey
    data
    text
    <p>I'm trying to write a program for a computer with 2 network adapters (Private and Public) that echoes data received on Private to Public and vice versa. I only need it to listen on two specific ports, and more specifically, it should open a socket server on Private and a socket client on Public.</p> <p>The computer's IP address on Public is 192.168.1.21 and its IP address on Private is 172.16.13.1, so I thought something like this would work:</p> <pre><code>IPEndPoint privateEndpoint1 = new IPEndPoint(IPAddress.Parse("172.16.13.1"), port1); IPEndPoint privateEndpoint2 = new IPEndPoint(IPAddress.Parse("172.16.13.1"), port2); IPEndPoint publicEndpoint1 = new IPEndPoint(IPAddress.Parse("192.168.1.21"), port1); IPEndPoint publicEndpoint2 = new IPEndPoint(IPAddress.Parse("192.168.1.21"), port2); TcpListener priList1 = new TcpListener(privateEndpoint1); TcpListener priList2 = new TcpListener(privateEndpoint2); TcpClient pubCli1 = new TcpClient(publicEndpoint1); //Error here TcpClient pubCli2 = new TcpClient(publicEndpoint2); </code></pre> <p>I then get the streams and do the actual echoing.</p> <p>The problem is that I get an error on the line that I marked:</p> <blockquote> <p>Only one usage of each socket address (protocol/network address/port) is normally permitted</p> </blockquote> <p>It seems from the error that the <code>IPEndPoint</code> constructor is not differentiating between the two IP addresses and the two network adapters. I've looked into using normal <code>Socket</code>s instead of <code>TcpClient</code>s, but that didn't seem to change anything.</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. US0xFE
    plurals
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. COWhat is the value of `port1` and `port2`? Also, is there something already listening on `192.168.1.21:port1` ?
      singulars
      1. POTCP Echo on different adapter
      1. USSam Axe
    2. CO`port1` and `port2` come from the command line arguments. There is another service listening on 192.168.1.21:port1. Basically, the other service is expecting a connection on the wrong network adapter, which is why I'm writing this program.
      singulars
      1. POTCP Echo on different adapter
      1. US0xFE
    3. COIt might be much simpler to use something like SSH tunnels to get the traffic going in the right direction. ; I can not see any reason your code should be throwing that exception based solely on what you have shown us.
      singulars
      1. POTCP Echo on different adapter
      1. USSam Axe
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload