INNACOMM W3100V, Руководство пользователя

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You then assign the public ports that are to be opened for the application to
this trigger port. The router checks all outgoing data for the port number and
protocol. If it identifies a match of port and protocol for a defined trigger port,
then it opens the assigned public ports and notes the IP address of the PC
that sent the data. If data comes back from the Internet via one of these
public ports, the router allows it to pass through and directs it to the
appropriate PC. A trigger event always comes from a PC within the local
network. If a trigger port is addressed from outside, the router simply ignores
it.
Note :
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An application that is configured for port triggering can only be run by one
user in the local network at a time.
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After public ports are opened, they can be used by unauthorized persons to
gain access to a PC in the local network.
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When the DSL router is supplied, the NAT function is activated. For example,
all IP addresses of PCs in the local network are converted to the public IP
address of the router when accessing the Internet. You can use NAT settings
to configure the DSL router to carry out the following tasks.
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For functions described as follows, IP addresses of the PCs must remain
unchanged. If the IP addresses of the PCs are assigned via the DHCP
server of the DSL router, you must disable DHCP server as the settings in
the local network menu entry for the lease time or assign static IP addresses
for the PCs.
You can enable or disenable the NAT function. By default, the NAT function is
enabled.
3.4.3.2 NAT-Virtual Server Setup
By default, DSL router blocks all external users from connecting to or
communicating with your network. Therefore, the system is safe from hackers who
may try to intrude into the network and damage it.
However, you may want to expose your network to the Internet in limited and
controlled ways in order to enable some applications to work from the LAN (for
example, game, voice, and chat applications) and to enable Internet access to
servers in the home network. The port forwarding feature supports both
functionalities. This topic is also referred as Local Servers.