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servers, FTP servers, mail servers, etc. so that they can be accessible from the public Internet.
Commonly used Port numbers:
•HTTP: 80
•FTP: 20, 21
•Secure Shell: 22
•Telnet: 23
•SMTP
•SNMP: 161
To map a port, enter the range of port numbers that should be forwarded locally and the IP address to which traffic to those ports should be sent. To map only a single port, enter the same port number in the “start” and “end” locations for that IP address.
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