How to make the computer listen to a single port

[ganto]

Hello,
i want my computer to make connections to only a single port (53 in this case)......how can i do this? i am using a wireless broadband data card. i am using windows 7 ultimate. is there any way to make such settings in my pc and if so how do i set or make the settings so that my computer will only make connections and also listen to the single port 53? please help !!!

 

[PhilFrisbie]

You only want to connect to DNS servers and you want to run your own DNS server on this PC? Please explain.

 

[ganto]

no i just want my pc to make connection's with port 53, i mean both incoming and outgoing connection's. yes that means that i only want to connect to the dns server, can you help me with this setting in my windows 7? and i am not talking about the server address being filled in the network panel i just want to know the exact setting by which my pc will only listen to port 53 on the net!

 

[PhilFrisbie]

Only a DNS server will listen on port 53; a desktop PC will not listen on port 53. Also, DNS requests from a PC do not go out from port 53, they go out from a random port to port 53 on the DNS server. You cannot force a PC to use port 53 for OUTBOUND connections.

Now, please explain WHAT you are trying to accomplish, and not what you think you need to do

 

[ganto]

oh ok so i got it, actually i thought that there might be a way to force connection's in that way ( here is was thinking the same way how a VPN works coz i a VPN it uses a single local port , 53 in this case, to make connection's to the net, throught a tunnel, so i thought if there was a way to make that directly without depending on any VPN service to do it for me so i thought that if there was a way to make this tunnel manually without any VPN program )

 

[PhilFrisbie]

Hmm, I have never heard of a VPN client that bound itself to a specific port like 53.

Anyway, you cannot emulate a VPN connection just by forcing some ports.

 

[ganto]

"actually vpn's use a open port to get connected to their servers.....the open port on my network is 53, so the vpn's use this port to bind to their servers making a tunnel through the network using this open port........."

 

[PhilFrisbie]

Yes, they use a REMOTE port of 53, and it is remote ports that can be blocked by your router/firewall, but the client software will use a random port on the client PC for the connection.

The same goes for browsers. The local port is NEVER 80, but they connect to port 80 for normal HTTP.

 

[ganto]

"ok thanx for your help man, actually i thought that there was a way to replicate a tunnel process and make the pc also tunnel through and get a connection through the pc to external anonymous proxies , but seems that it is not possible as you said above, so thanx for your time man....."

 

[PhilFrisbie]

No problem.