Ports 0-1023 are the Well Known Ports and are assigned by IANA. These should only be used for the assigned protocols on public networks. Ports 1024-65535 used to be called Registered Port Numbers (see rfc1700) but are now split into two areas (see rfc6335). Ports 1024-49151 are the User Ports and are the ones to … Read more
After some testing Android Studio already supports this. You just need perform the following ADB commands, and now you can see the logcat and even wirelessly load your application. No USB cable needed! From: http://developer.android.com/tools/help/adb.html#wireless $ adb tcpip 5555 restarting in TCP mode port: 5555 Finding out IP address of Android device prior to running … Read more
They are two vastly different mechanisms. ###PSH and the PUSH function When you send data, your TCP buffers it. So if you send a character it won’t send it immediately but wait to see if you’ve got more. But maybe you want it to go straight on the wire: this is where the PUSH function … Read more
When you want to use curl, you need REST over RESP, like webdis, tinywebdis or turbowebdis. See https://github.com/markuman/tinywebdis#turbowebdis-tinywebdis–cherrywebdis $ curl -w ‘\n’ http://127.0.0.1:8888/ping {“ping”:”PONG”} Without a REST interface for redis, you can use netcat for example. $ (printf “PING\r\n”;) | nc <redis-host> 6379 +PONG For password protected redis you can use netcat like this: $ … Read more
Something that should be noted here, and that most people overlook completely, is the fact, that the TCP checksum is actually a very poor checksum. The TCP checksum is a 16-bit ones-complement sum of the data. This sum will catch any burst error of 15 bits or less, and all 16-bit burst errors except for … Read more
That thread “Best way to reliably detect that a TCP connection is closed”, using net.Conn for ‘c‘ (also seen in utils/ping.go or locale-backend/server.go or many other instances): one := make([]byte, 1) c.SetReadDeadline(time.Now()) if _, err := c.Read(one); err == io.EOF { l.Printf(logger.LevelDebug, “%s detected closed LAN connection”, id) c.Close() c = nil } else { … Read more
According to RFC 5737: The blocks 192.0.2.0/24 (TEST-NET-1), 198.51.100.0/24 (TEST-NET-2), and 203.0.113.0/24 (TEST-NET-3) are provided for use in documentation. This means you can use pick an IP address from these ranges: 192.0.2.0 – 192.0.2.255 198.51.100.0 – 198.51.100.255 203.0.113.0 – 203.0.113.255
Let’s break this up into parts. First of, the network is based in IP, which is a protocol that assigns an address to each network node, and which allows you to send small amounts of data (usually up to 64kB, but typically only 1500B) from one node to another. That by itself isn’t worth much … Read more
Each socket in TIME_WAIT consumes some memory in the kernel, usually somewhat less than an ESTABLISHED socket yet still significant. A sufficiently large number could exhaust kernel memory, or at least degrade performance because that memory could be used for other purposes. TIME_WAIT sockets do not hold open file descriptors (assuming they have been closed … Read more
The following configs works on Cent OS 6 or earlier As stated above first have to disable selinux. Step 1 nano /etc/sysconfig/selinux Make sure the file has this configurations SELINUX=disabled SELINUXTYPE=targeted Then restart the system Step 2 iptables -A INPUT -m state –state NEW -p tcp –dport 8080 -j ACCEPT Step 3 sudo service iptables … Read more