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P100IH ISDN Router
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.
The most often used port numbers are shown in the following table. Please refer to RFC 1700 for further
information about port numbers. Please also refer to our PNC Disk for more examples and details on NAT.
Services
FTP (File Transfer Protocol)
Telnet
SMTP (Simple Mail Transfer Protocol)
DNS(Domain Name System)
HTTP (Hyper Text Transfer protocol or WWW, Web) 80
PPTP (Point-to-Point Tunneling Protocol)
4.6
Examples
4.6.1
Example 1 - Internet Access Only
In our Internet access example, we only need one rule where all our ILAs (Inside Local addresses) map to
one dynamic IGA (Inside Global Address) assigned by our ISP.
NAT
Table 4-6 Services & Port numbers
Figure 4-15 NAT Example 1
Port Number
21
23
25
53
1723
4-15
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Troubleshooting
