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Reference Manual for the Model DG814 DSL Modem Internet Gateway
Introduction 1-3
Content Filtering
With its content filtering features, the Model DG814 gateway prevents objectionable content from
reaching your PCs. Its content filtering features include:
• Content filtering by domain or keyword
The Model DG814 gateway uses content filtering to enforce your network’s Internet access
policies. The gateway allows you to control access to Internet content by screening for
keywords within Website names or newsgroup names.
• Logging of inappropriate use
You can configure the Model DG814 gateway to log access to Web sites and to e-mail the log
to you. You can also configure the gateway to send an immediate alert e-mail message to you
whenever a local user attempts to access a blocked Web site.
Security
The Model DG814 gateway is equipped with several features designed to maintain security, as
described in this section.
• PCs Hidden by NAT
Network address translation (NAT) opens a temporary path to the Internet for requests
originating from the local network. Requests originating from outside the LAN are discarded,
preventing users outside the LAN from finding and directly accessing the PCs on the LAN.
• Port Forwarding with NAT
Although NAT prevents Internet locations from directly accessing the PCs on the LAN, the
gateway allows you to direct incoming traffic to specific PCs based on the service port number
of the incoming request, or to one designated “DMZ” host computer. You can specify
forwarding of single ports or ranges of ports.
Autosensing 10/100 Ethernet
With its internal, 4-port 10/100 switch, the Model DG814 gateway can connect to either a 10 Mbps
standard Ethernet network or a 100 Mbps Fast Ethernet network. The local LAN interface is
autosensing and is capable of full-duplex or half-duplex operation.