Vigor3900 Series User’s Guide
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5.
A new profile has been added onto
Neighbor
table.
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NAT (Network Address Translation) is a method of mapping one or more IP addresses
and/or service ports into different specified services. It allows the internal IP addresses of
many computers on a LAN to be translated to one public address to save costs and resources
of multiple public IP addresses. It also plays a security role by obscuring the true IP
addresses of important machines from potential hackers on the Internet. The Vigor 3900
Series is NAT-enabled by default and gets one globally routable IP addresses from the ISP
by Static, PPPoE, or DHCP mechanism. The Vigor3900 Series assigns private network IP
addresses according to RFC-1918 protocol and translates the private network addresses to a
globally routable IP address so that local hosts can communicate with the router and access
the Internet.
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Port Redirection
means port forwarding. It
may be used to expose internal servers to the
public domain or open a specific port to internal hosts. Internet hosts can use the WAN IP
address to access internal network services, such as FTP, WWW and etc. The internal FTP
server is running on the local host addressed as 192.168.1.2. When other users send this type
of request to your network through the Internet, the router will direct these requests to an
appropriate host inside. A user can also translate the port to another port by configuration.
For example, port number with 1024 can be transferred into IP address of 192.168.1.100 of
LAN. The packet is forwarded to a specific local host if the port number matches that
defined in the table.
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