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I just came across this strange thing I got to see application is that by default they use SOCK_STREAM function. Why is it so? Is this SOCK_STREAM just creating multiple streams? Or is it the standard SOCK_STREAM function available for creating TCP stream(s)?
I thought tsunami is based on UDP, but still having some features like that of TCP, e.g. TCP fairness, friendlyness, etc.
Could somebody please shed some light on this issue? I am totally confused over this.
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In the UNIX domain, the SOCK_DGRAM socket type is similar to a message queue. In the Internet domain, the SOCK_DGRAM socket type is implemented on the User Datagram Protocol/Internet Protocol (UDP/IP) protocol. A datagram socket supports the bidirectional flow of data, which is not sequenced, reliable, or unduplicated.
AF_INET is the Internet address family for IPv4. SOCK_STREAM is the socket type for TCP, the protocol that will be used to transport messages in the network. The . bind() method is used to associate the socket with a specific network interface and port number: # echo-server.py # ... with socket.
SOCK_STREAM means that it is a TCP socket. SOCK_DGRAM means that it is a UDP socket. These are used 99% of the time. There are other possibilities as well, see https://docs.python.org/2/library/socket.html#socket.SOCK_STREAM (you will have to google for the meaning of each one).
The socket type is SOCK_STREAM . Datagram sockets enable processes to use UDP to communicate. A datagram socket supports a bidirectional flow of messages. A process on a datagram socket can receive messages in a different order from the sending sequence.
TCP almost always uses SOCK_STREAM and UDP uses SOCK_DGRAM.
TCP (SOCK_STREAM) is a connection-based protocol. The connection is established and the two parties have a conversation until the connection is terminated by one of the parties or by a network error.
UDP (SOCK_DGRAM) is a datagram-based protocol. You send one datagram and get one reply and then the connection terminates.
If you send multiple packets, TCP promises to deliver them in order. UDP does not, so the receiver needs to check them, if the order matters.
If a TCP packet is lost, the sender can tell. Not so for UDP.
UDP datagrams are limited in size, from memory I think it is 512 bytes. TCP can send much bigger lumps than that.
TCP is a bit more robust and makes more checks. UDP is a shade lighter weight (less computer and network stress).
Choose the protocol appropriate for how you want to interact with the other computer.
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