ZyXEL Communications 1 Betriebsanweisung Seite 131

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11-16 NAT
Table 11-7 Services & Port Numbers
SERVICES PORT NUMBER
ECHO 7
FTP (File Transfer Protocol) 21
Telnet 23
SMTP (Simple Mail Transfer Protocol) 25
DNS (Domain Name System) 53
Finger 79
HTTP (Hyper Text Transfer protocol or WWW, Web) 80
POP3 (Post Office Protocol) 110
NNTP (Network News Transport Protocol) 119
SNMP (Simple Network Management Protocol) 161
SNMP trap 162
PPTP (Point-to-Point Tunneling Protocol) 1723
Configuring a Server behind NAT
Follow these steps to configure a server behind NAT:
Step 1. Enter 15 in the main menu to go to Menu 15 - NAT Setup.
Step 2. Enter 2 to go to Menu 15.2 - NAT Server Setup.
Step 3. Enter a port number in an unused Start Port No field. To forward only one port, enter it again
in the End Port No field. To specify a range of ports, enter the last port to be forwarded in the
End Port No field.
Step 4. Enter the inside IP address of the server in the IP Address field. In the following figure, you
have a computer acting as an FTP, Telnet and SMTP server (ports 21, 23 and 25) at
192.168.1.33.
Step 5. Press [ENTER] at the “Press ENTER to confirm …” prompt to save your configuration after
you define all the servers or press [ESC] at any time to cancel.
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