Siemens Gigaset SX761 dsl Manual page 51

Note:
An application that is configured for port triggering can only be run by one user in
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the local network at a time.
As long as the public ports are open, they can be used by unauthorised persons to
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gain access to a PC in the local network.
When the Gigaset SX761 dsl is supplied, the
is activated, i.e. all IP addresses of PCs in the local network are converted to the router's
public IP address when accessing the Internet.
You can use the NAT settings to configure the Gigaset SX761 dsl to carry out the follow-
ing tasks:
Set up port triggering for special applications (page 52),
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Set up the Gigaset SX761 dsl as a virtual server by configuring Port Forwarding
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(page 53),
Open the firewall for a selected PC (page 54).
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Note:
For the functions described below, the IP addresses of the PCs must remain
unchanged. If the IP addresses of the PCs are assigned via the DHCP server of the
Gigaset SX761 dsl, you must select Never expires (page 59) as the setting in the
Local Network menu entry for the Lease time or assign static IP addresses for the
PCs.
By default the NAT function is activated. You should only deactivate the NAT function if
you want to configure you own firewall in you local network.
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In the Advanced Settings menu, select: Internet – Address Translation (NAT)
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Select the required option.
Configuring Advanced Settings
NAT function (Network Address Translation)
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