System Administration Guide Network Configuration
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Revised: August 5, 2005 Page 10
5.3 Network Mode: NAT/Firewall
When the network mode is set to NAT/Firewall, the logical network capability is as shown in the diagram
below.
This mode’s default setting permits only outbound connections from the LAN to the WAN; all WAN initiated
connections are denied. In addition, all packets are subject to network address translation (NAT) such that no
LAN addresses are “visible” on the WAN, yet have access to the WAN. These features reduce the ability of
WAN hosts to attack LAN hosts.
WAN access to specific LAN network services can be allowed by exposing those specific LAN ports through
the firewall. This configuration is made in the Firewall section of the Network / Configuration / Modify page.
Bizfon 700
IP Router
WAN Network
Services
LAN Network
Services
Switch
4 Ports
Firewall
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