ZyXEL Communications P-2608HWL-Dx Series User Manual

P-2608HWL-Dx Series User’s Guide

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Appendix D Common Services

NFS(UDP:2049) 

Network File System - NFS is a client/server distributed file service 

that provides transparent file sharing for network environments.

NNTP(TCP:119) 

Network News Transport Protocol is the delivery mechanism for the 

USENET newsgroup service.

PING(ICMP:0)

Packet INternet Groper is a protocol that sends out ICMP echo 

requests to test whether or not a remote host is reachable.

POP3(TCP:110)

Post Office Protocol version 3 lets a client computer get e-mail from a 

POP3 server through a temporary connection (TCP/IP or other).

PPTP(TCP:1723)

Point-to-Point Tunneling Protocol enables secure transfer of data 

over public networks. This is the control channel.

PPTP_TUNNEL(GRE:0)

Point-to-Point Tunneling Protocol enables secure transfer of data 

over public networks. This is the data channel.

RCMD(TCP:512) 

Remote Command Service.

REAL_AUDIO(TCP:7070) 

A streaming audio service that enables real time sound over the web.

REXEC(TCP:514) 

Remote Execution Daemon.

RLOGIN(TCP:513) 

Remote Login.

RTELNET(TCP:107) 

Remote Telnet.

RTSP(TCP/UDP:554)

The Real Time Streaming (media control) Protocol (RTSP) is a 

remote control for multimedia on the Internet. 

SFTP(TCP:115) 

Simple File Transfer Protocol.

SMTP(TCP:25) 

Simple Mail Transfer Protocol is the message-exchange standard for 

the Internet. SMTP enables you to move messages from one e-mail 

server to another.

SNMP(TCP/UDP:161) 

Simple Network Management Program.

SNMP-TRAPS(TCP/UDP:162) 

Traps for use with the SNMP (RFC:1215).

SQL-NET(TCP:1521) 

Structured Query Language is an interface to access data on many 

different types of database systems, including mainframes, midrange 

systems, UNIX systems and network servers.

SSH(TCP/UDP:22)

Secure Shell Remote Login Program.

STRM WORKS(UDP:1558) 

Stream Works Protocol.

SYSLOG(UDP:514)

Syslog allows you to send system logs to a UNIX server.

TACACS(UDP:49) 

Login Host Protocol used for (Terminal Access Controller Access 

Control System).

TELNET(TCP:23) 

Telnet is the login and terminal emulation protocol common on the 

Internet and in UNIX environments. It operates over TCP/IP 

networks. Its primary function is to allow users to log into remote host 

systems.

TFTP(UDP:69) 

Trivial File Transfer Protocol is an Internet file transfer protocol 

similar to FTP, but uses the UDP (User Datagram Protocol) rather 

than TCP (Transmission Control Protocol).

VDOLIVE(TCP:7000) 

Another videoconferencing solution.

Table 159   Commonly Used Services