Revisiting bind contd.

• int bind(int sockfd, struct sockaddr *my_addr, socklen_t addrlen);

• Servers usually bind a well-known port, while clients leave the kernel to choose an ephemeral port.

• A process can bind a specific IP address (must belong to an interface of the host):

  • For a TCP client specifies the IP source for packets sent from that socket
  • For a TCP server it restricts the socket to receive incoming client connection destined only to that IP address

• It is normally necessary to assign a local address using bind before a SOCK_STREAM socket may receive connections.