ZyXEL Communications 641 manual Multiple Server Configuration, Services vs. Port number

Prestige 641 ADSL Internet Access Router

	Menu 15 - Multiple Server Configuration
Port #		IP Address
	----	---------------
1.Default		0.0.0.0
2.	0
		0.0.0.0
3.	0
		0.0.0.0
4.	0
		0.0.0.0
5.	0
		0.0.0.0
6.	0
		0.0.0.0
7.	0
		0.0.0.0
8.	0
		0.0.0.0

Press ENTER to Confirm or ESC to Cancel:

Figure 3-7 Multiple Server Configuration

The most often used port numbers are:

Table 3-6 Services vs. Port number

Services	Port Number
FTP (File Transfer Protocol)	21
Telnet	23
SMTP (Simple Mail Transfer Protocol)	25
DNS(Domain Name System)	53
HTTP (Hyper Text Transfer protocol or WWW, Web)	80
PPTP (Point-to-Point Tunneling Protocol)	1723

3-14 Internet Access