Billion 7800DX, User Manual

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Virtual Servers
In TCP/IP and UDP networks a port is a 16-bit number used to identify which application program
(usually a server) incoming connections should be delivered to. Some ports have numbers that are
pre-assigned to them by the IANA (the Internet Assigned Numbers Authority), and these are referred
to as “well-known ports”. Servers follow the well-known port assignments so clients can locate them.
If you wish to run a server on your network that can be accessed from the WAN (i.e. from other
machines on the Internet that are outside your local network), or any application that can accept
incoming connections (e.g. Peer-to-peer/P2P software such as instant messaging applications and
P2P file-sharing applications) and are using NAT (Network Address Translation), then you will
usually need to configure your router to forward these incoming connection attempts using specific
ports to the PC on your network running the application. You will also need to use port forwarding if
you want to host an online game server.
The reason for this is that when using NAT, your publicly accessible IP address will be used by and
point to your router, which then needs to deliver all traffic to the private IP addresses used by your
PCs. Please see the
WAN
configuration section of this manual for more information on NAT.
The device can be configured as a virtual server so that remote users accessing services such as
Web or FTP services via the public (WAN) IP address can be automatically redirected to local
servers in the LAN network. Depending on the requested service (TCP/UDP port number), the
device redirects the external service request to the appropriate server within the LAN network.
This part is only available when NAT is enabled.
Note:
The maximum number of entries: 64.
It is virtual server listing table as you see, Click
Add
to move on.