Nlynx Wireless LAN Device Series ZWA-G120 - Manual (Page 45)

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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.
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.