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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:
An application that is configured for port triggering can
only be run by one user in the local network at a time.
After public ports are opened, they can be used by
unauthorized persons to gain access to a PC in the local
network.
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.
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.
4.4.3.2 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.
