Bizfon 7000 User's Guide Page 14

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System Administration Guide Network Configuration
50 Stiles Road • Salem, NH 03079 • Toll Free 1-800-260-5793 • 603-870-9400 • www.Bizfon.com
© 2005 All rights reserved. Bizfon is a registered trademark. All other names may be trademarks or registered trademarks of their respective owners.
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
0
IP Router
WAN Network
Services
LAN Network
Services
LAN
Switch
WAN
4 Ports
Firewall
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