Since you’re using a TcpClient, that means you’re checking open TCP ports. There are lots of good objects available in the System.Net.NetworkInformation namespace. Use the IPGlobalProperties object to get to an array of TcpConnectionInformation objects, which you can then interrogate about endpoint IP and port. int port = 456; //<— This is your value bool … Read more
Your confusion lies in thinking that a socket is identified by Server IP : Server Port. When in actuality, sockets are uniquely identified by a quartet of information: Client IP : Client Port and Server IP : Server Port So while the Server IP and Server Port are constant in all accepted connections, the client … Read more
I’ve written something similar to this in the past. From my research years ago showed that writing your own socket implementation was the best bet, using the asynchronous sockets. This meant that clients not really doing anything actually required relatively few resources. Anything that does occur is handled by the .NET thread pool. I wrote … Read more
Yes, local interprocess communication by unix domain sockets should be faster than communication by loopback localhost connections because you have less TCP overhead, see here.
A ‘router’ could be doing anything – particularly NAT, which might involve any amount of bug-ridden messing with traffic… One reason a device will send a RST is in response to receiving a packet for a closed socket. It’s hard to give a firm but general answer, because every possible perversion has been visited on … Read more
TCP is a connection oriented stream over an IP network. It guarantees that all sent packets will reach the destination in the correct order. This imply the use of acknowledgement packets sent back to the sender, and automatic retransmission, causing additional delays and a general less efficient transmission than UDP. UDP is a connection-less protocol. … Read more
In short: You should be able to achieve in the order of millions of simultaneous active TCP connections and by extension HTTP request(s). This tells you the maximum performance you can expect with the right platform with the right configuration. Today, I was worried whether IIS with ASP.NET would support in the order of 100 … Read more
A connection timeout occurs only upon starting the TCP connection. This usually happens if the remote machine does not answer. This means that the server has been shut down, you used the wrong IP/DNS name, wrong port or the network connection to the server is down. A socket timeout is dedicated to monitor the continuous … Read more
You seem to be looking for a port scanner such as nmap or netcat, both of which are available for Windows, Linux, and Mac OS X. For example, check for telnet on a known ip: nmap -A 192.168.0.5/32 -p 23 For example, look for open ports from 20 to 30 on host.example.com: nc -z host.example.com … Read more
You have to go to Control Panel>Programs>Turn Windows features on or off. Then, check “Telnet Client” and save the changes. You might have to wait about a few minutes before the change could take effect.