ZyXEL Communications P-2302R-P1 - Manual (Page 14)

P2302R-P1 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.