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
A TCP connection is specified by the tuple (source IP, source port, destination IP, destination port). The reason why there is a TIME_WAIT state following session shutdown is because there may still be live packets out in the network on their way to you (or from you which may solicit a response of some sort). … Read more
Websockets are defined in RFC6455, which states in Section 5.3: The unpredictability of the masking key is essential to prevent authors of malicious applications from selecting the bytes that appear on the wire. In a blog entry about Websockets I found the following explanation: masking-key (32 bits): if the mask bit is set (and trust … Read more
UDP: Anything where you don’t care too much if you get all data always Tunneling/VPN (lost packets are ok – the tunneled protocol takes care of it) Media streaming (lost frames are ok) Games that don’t care if you get every update Local broadcast mechanisms (same application running on different machines “discovering” each other) TCP: … Read more
It can use either. By default, preference is given to UDP, but depending on the firewall(s) in between the peers connecting it may only be able to connect with TCP. You can use Wireshark to capture packets and verify whether TCP or UDP is being used. In Chrome you can also see details on the … Read more
The problems with TCP keepalive are: It is off by default. It operates at two-hour intervals by default, instead of on-demand as the Ping/Pong protocol provides. It operates between proxies rather than end to end. As pointed out by @DavidSchwartz, it operates between TCP stacks, not between the applications so therefore it doesn’t tell us … Read more
You can use encoding/binary’s ByteOrder to do this for 16, 32, 64 bit types Play package main import “fmt” import “encoding/binary” func main() { var mySlice = []byte{244, 244, 244, 244, 244, 244, 244, 244} data := binary.BigEndian.Uint64(mySlice) fmt.Println(data) }
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
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.
They work almost the same as today. However, be sure you include [] around your IP. For example : http://[1fff:0:a88:85a3::ac1f]:8001/index.html Wikipedia has a pretty good article about IPv6: http://en.wikipedia.org/wiki/IPv6#Addressing