User guide

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The ports used by some common applications are:
• HTTP: 80
• FTP: 20, 21
• Secure Shell: 22
• Telnet: 23
• SMTP e-mail: 25
• SNMP: 161
To map a port, you must enter the range of port numbers that should be forwarded locally
and the IP address to which traffic to those ports should be sent. If only a single port
specification is desired, enter the same port number in the “start” and “end” locations for
that IP address.