47
SMTP (Simple Mail Transfer Protocol)
25
DNS (Domain Name System)
53
Finger 79
HTTP (Hyper Text Transfer Protocol)
80
POP3 (Post Protocol)
110
NNTP (Network News Transport Protocol)
119
SNMP (Simple Network Management Protocol)
161
SNMP trap
162
SIP (Session Initiation Protocol)
5060
PPTP (Point-to-Point Tunneling Protocol)
1723
Multiple Servers behind NAT Example:
In this case, there are two PCs in the local network accessible for outside
users.
Internet
Device with Router Mode enabled
WLAN IP Address:192.168.2.254
Web Server
IP Address:192.168.2.1
Port:80
FTP Server
IP Address:192.168.2.2
Port:21
User
AP
AP Client #2
AP Client #1
Configuring DMZ
A Demilitarized Zone is used to provide Internet services without
sacrificing unauthorized access to its local private network. Typically, the
DMZ host contains devices accessible to Internet traffic, such as Web
(HTTP) servers, FTP servers, SMTP (e-mail) servers and DNS servers.
So that all inbound packets will be redirected to the computer you set. It
also is useful while you run some applications (ex. Internet game) that use
uncertain incoming ports.
