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Reference Manual for the Model FVS318 Cable/DSL ProSafe VPN Firewall
Introduction 1-3
Protocol Support
The FVS318 VPN Firewall supports the Transmission Control Protocol/Internet Protocol (TCP/
IP) and Routing Information Protocol (RIP).
For further information about TCP/IP, refer to Appendix B, “Networks, Routing, and Firewall
Basics.”
• IP Address Sharing by NAT
The FVS318 VPN Firewall allows several networked PCs to share an Internet account using
only a single IP address, which may be statically or dynamically assigned by your Internet
service provider (ISP). This technique, known as Network Address Translation (NAT), allows
the use of an inexpensive single-user ISP account.
• Automatic Configuration of Attached PCs by DHCP
The FVS318 VPN Firewall dynamically assigns network configuration information, including
IP, gateway, and domain name server (DNS) addresses, to attached PCs on the LAN using the
Dynamic Host Configuration Protocol (DHCP). This feature greatly simplifies configuration
of PCs on your local network.
• DNS Proxy
When DHCP is enabled and no DNS addresses are specified, the firewall provides its own
address as a DNS server to the attached PCs. The firewall obtains actual DNS addresses from
the ISP during connection setup and forwards DNS requests from the LAN.
• PPP over Ethernet (PPPoE)
PPP over Ethernet is a protocol for connecting remote hosts to the Internet over a DSL
connection by simulating a dial-up connection. This feature eliminates the need to run a login
program such as Entersys or WinPOET on your PC.
•DynamicDNS
Dynamic DNS services allow remote users to find your network using a domain name when
your IP address is not permanently assigned. The firewall contains a client that can connect to
many popular Dynamic DNS services to register your dynamic IP address.
Easy Installation and Management
You can install, configure, and operate the FVS318 VPN Firewall within minutes after connecting
it to the network. The following features simplify installation and management tasks: