ZyXEL Communications P-660R-T1 Support Notes page 52

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The most often used port numbers are shown in the following table. Please refer RFC
1700 for further information about port numbers.
Service
FTP
Telnet
SMTP
DNS (Domain Name Server)
www-http (Web)
PPTP (Point-to-Point Tunneling
Protocol)
Examples
•
Internet Access Only
•
Internet Access with an Internal Server
•
Using Multiple Global IP addresses for clients and servers
•
Support Non NAT Friendly Applications
1. Internet Access Only
In our Internet Access example, we only need one rule where all our ILAs m
IGA assigned by the ISP. See the following figure.
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Port Number
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80
1723
P-660 series Support Notes
ap to one
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