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P2302R-P1C Support Notes
All contents Copyright 2007 ZyXEL Communications Corporation.
14
Port numbers for some services
Service
Port Number
FTP
21
Telnet
23
SMTP
25
DNS (Domain Name Server)
53
www-http (Web)
80
Configure a PPTP server Behind SUA
Introduction
PPTP is a tunneling protocol defined by the PPTP forum that allows PPP packets to be encapsulated within
Internet Protocol (IP) packets and forwarded over any IP network, including the Internet itself.