ZyXEL Communications P-334U, P-335U manual 310

P-334U/P-335U User’s Guide

Table 134 Examples of Services (continued)

NAME	PROTOCOL	PORT(S)	DESCRIPTION
HTTP	TCP	80	Hyper Text Transfer Protocol - a client/
			server protocol for the world wide web.
HTTPS	TCP	443	HTTPS is a secured http session often used
			in e-commerce.
ICMP	User-Defined	1	Internet Control Message Protocol is often
			used for diagnostic purposes.
ICQ	UDP	4000	This is a popular Internet chat program.
IGMP (MULTICAST)	User-Defined	2	Internet Group Multicast Protocol is used
			when sending packets to a specific group of
			hosts.
IKE	UDP	500	The Internet Key Exchange algorithm is
			used for key distribution and management.
IMAP4	TCP	143	The Internet Message Access Protocol is
			used for e-mail.
IMAP4S	TCP	993	This is a more secure version of IMAP4 that
			runs over SSL.
IRC	TCP/UDP	6667	This is another popular Internet chat
			program.
MSN Messenger	TCP	1863	Microsoft Networks’ messenger service
			uses this protocol.
NetBIOS	TCP/UDP	137	The Network Basic Input/Output System is
	TCP/UDP	138	used for communication between
			computers in a LAN.
	TCP/UDP	139
	TCP/UDP	445
NEW-ICQ	TCP	5190	An Internet chat program.
NEWS	TCP	144	A protocol for news groups.
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	User-Defined	1	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).
POP3S	TCP	995	This is a more secure version of POP3 that
			runs over SSL.
PPTP	TCP	1723	Point-to-Point Tunneling Protocol enables
			secure transfer of data over public
			networks. This is the control channel.
PPTP_TUNNEL	User-Defined	47	PPTP (Point-to-Point Tunneling Protocol)
(GRE)			enables secure transfer of data over public
			networks. This is the data channel.

310 Appendix G Services