Draytek Vigor2500V Manual page 48

NAT
5.3 Configure Port Redirection Table
The Port Redirection is for you to expose internal servers to the public
domain. For example, you run a web server and some users want to access
this web server. You also run an internal SMTP mail server for your home
office and you shall allow your ISP to send whole E-mail to your SMTP mail
server. Consequently, you assign different port number on the Port
Redirection Table to different services such as http, smtp, ftp etc. External
users, i.e. people elsewhere on the Internet can then access your web server
via your public IP address. Even if your public IP address is a dynamic IP
address, you can apply the Dynamic DNS service to obtain an online WAN IP
address (such as hostnmae.dyndns.org) where is able to be mapped to your
current dynamic IP address. Any external user can visit your web server
simply via your online WAN IP address.
The following example shows how an internal FTP server is exposed to the
public domain. The internal FTP server is running on the local host addressed
as 192.168.1.10.
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