ZyXEL Communications P-660RU-Tx Series Support Notes page 34

Default port numbers for some services
Service
FTP
SSH
Telnet
SMTP
DNS (Domain Name Server)
www-http (Web)
POP3
HTTPs
PPTP
VNC
T.120
H.232
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.
In order to run the Windows 9x PPTP client, you must be able to establish an IP
connection with a tunnel server such as the Windows NT Server 4.0 Remote
Access Server.
Windows Dial-Up Networking uses the Internet standard Point-to-Point (PPP) to
provide a secure, optimized multiple-protocol network connection over dial-up
telephone lines. All data sent over this connection can be encrypted and
compressed, and multiple network level protocols (TCP/IP, NetBEUI and
All contents copyright © 2010 ZyXEL Communications Corporation.
P-660RU-Tx Series Support Note s
Port Number
21
22
23
25
53
80
110
443
1723
5900
1503
1720
34