There is no TCP API that will tell you the current state of the connection. isConnected() and isClosed() tell you the current state of your socket. Not the same thing. isConnected() tells you whether you have connected this socket. You have, so it returns true. isClosed() tells you whether you have closed this socket. Until … Read more
I was unable to get @Factor Mystic’s answer to work with POSIX regular expressions, so I wrote one that works with POSIX regular expressions and PERL regular expressions. It should match: IPv6 addresses zero compressed IPv6 addresses (section 2.2 of rfc5952) link-local IPv6 addresses with zone index (section 11 of rfc4007) IPv4-Embedded IPv6 Address (section … Read more
For my suggestion, please read the last section: “When to use SO_LINGER with timeout 0”. Before we come to that a little lecture about: Normal TCP termination TIME_WAIT FIN, ACK and RST Normal TCP termination The normal TCP termination sequence looks like this (simplified): We have two peers: A and B A calls close() A … Read more
What if I encounter an unrecognized extension header type? From RFC 2460: If, as a result of processing a header, a node is required to proceed to the next header but the Next Header value in the current header is unrecognized by the node, it should discard the packet and send an ICMP Parameter Problem … Read more
The marked answer is 100% fine, however, there are certain cases when the standard method is fooled by virtual cards (virtual box, …). It’s also often desirable to discard some network interfaces based on their speed (serial ports, modems, …). Here is a piece of code that checks for these cases: /// <summary> /// Indicates … Read more
It turns out there are three options (including the two already answered earlier): >>> import platform >>> import socket >>> import os >>> platform.node() ‘DARK-TOWER’ >>> socket.gethostname() ‘DARK-TOWER’ >>> os.environ[‘COMPUTERNAME’] ‘DARK-TOWER’
This might help lsof -n -i4TCP:8080 The PID is the second field in the output. Or try: lsof -i -P
The reason this question still often arises is because, as you mentioned, somewhere somehow someone presumed as important wrote that the RFC states domain names without subdomain in front of them are not valid. If you read the RFC carefully, however, you’ll find that this is not exactly what it says. In fact, RFC 1912 … Read more
Important: this was correct when written, but in $current_year$, please see the HttpClient answer below using(WebClient client = new WebClient()) { string s = client.DownloadString(url); }
Go here and pick a port with the description Unassigned