ZyXEL Communications P-870HW-I User Manual

P-870HW-I1 User’s Guide

432

Appendix I Services

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
TCP/UDP
TCP/UDP
TCP/UDP

137
138
139
445

The Network Basic Input/Output System is 

used for communication between 

computers in a LAN.

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 

(GRE)

User-Defined

47

PPTP (Point-to-Point Tunneling Protocol) 

enables secure transfer of data over public 

networks. This is the data channel.

RCMD

TCP

512

Remote Command Service.

Table 204   Examples of Services (continued)