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real time. In contrast, the biff daemon, which lets the user know that new mail has arrived, doesn t really require real-time access, since no interactive commands are issued. In this case, UDP is more appropriate than TCP. In technical terms, TCP is a connection-oriented protocol, while UDP is a connectionless protocol. This means that where services use TCP to transmit data, a persistent connection must be maintained between the client and the server. There are some important differences in the way that data is packed using TCP and UDP. In TCP, sequence numbers are issued to ensure that packet delivery is consistent. UDP has much less restrictive requirements, which reduces the amount of bandwidth required to carry UDP traffic compared to equivalent services that utilize TCP. Sockets provide a way to uniquely bind protocols to ports and addresses on the client and server. They consist of a five-tuple (host, address/host, port/client, address/client, port/protocol). While many sockets on a server can have the same host and address/port concurrently, they can be uniquely addressed because the client address is different for each client; thus the server always knows which client to interact with. But you can never create a socket with exactly the same tuple otherwise, you ll generate a binding error. All TCP and UDP services operate through a specific port. Sometimes, a service is offered over both TCP and UDP ports, such as the ldap daemon, which operates on port 389 TCP and port 389 UDP. However, many services operate only on TCP or UDP. One service may operate on a specific TCP port, while a separate service may operate on the same numbered port for UDP. There are conventions for operating services on specific ports, although these may be modified on a local system. For example, the default port number for operating the Apache Web server is port 80 TCP, but any other TCP port may be used, as long as it is not being used by another service. When a remote client connects to a locally operated service, a port listener receives the connection for the appropriate service, as defined by the port number. This prevents data destined for one service from being diverted to another (inappropriate) service. A server socket is formed by the service port and the local IP address for the server. A client socket is formed in the same way, by the client s IP address and the appropriate port. In this way, clientserver interactions can be described by the two sockets. The kernel has a port table that it maintains to match up client and server ports and IP addresses, which can be viewed by using the netstat command:
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# netstat TCP: IPv4 Local Address Remote Address Swind Send-Q Rwind Recv-Q State -------------------- -------------------- ----- ------ ----- ------ ------ivana.telnet austin.1040 8550 1 24820 0 ESTABLISHED ivana.32807 ivana.32782 32768 0 32768 0 TIME_WAIT Active UNIX domain sockets Address Type Vnode Conn Local Addr Remote Addr 30000b0dba8 stream-ord 300006cb810 00000000 /tmp/.X11-unix/X0 30000b0dd48 stream-ord 00000000 00000000
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In this example, a socket comprised of the host ivana and the telnet port is servicing a telnet session for the client austin with the remote port 1040. All of the standard services are mapped in the services database (/etc/services). These ports are defined as part of the work of the Internet Engineering Task Force (IETF), and the Request For Comments (RFC) process for defining Internet standards (http://www.rfc-editor.org/ rfc.html). Generally, standard services are defined for ports 1 to 1,024, which correspond to privileged ports on UNIX, since only the superuser may execute services that operate in this range. Any user may execute services that operate on ports 1,025 and above. The following is an example entry in /etc/services:
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