Reference Manual for the ProSafe VPN Firewall FVS318v3
Basic Virtual Private Networking 5-3
January 2005
Figure 5-2: Gateway-to-gateway VPN tunnel
A VPN between two or more NETGEAR VPN-enabled firewalls is a good way to connect branch
or home offices and business partners over the Internet. VPN tunnels also enable access to network
resources across the Internet. In this case, use FVS318v3s on each end of the tunnel to form the
VPN tunnel end points. See “How to Set Up a Gateway-to-Gateway VPN Configuration” on page
5-20 to set up this configuration.
Planning a VPN
To set up a VPN connection, you must configure each endpoint with specific identification and
connection information describing the other endpoint. You must configure the outbound VPN
settings on one end to match the inbound VPN settings on other end, and vice versa.
This set of configuration information defines a security association (SA) between the two VPN
endpoints. When planning your VPN, you must make a few choices first:
• Will the local end be any device on the LAN, a portion of the local network (as defined by a
subnet or by a range of IP addresses), or a single PC?
• Will the remote end be any device on the remote LAN, a portion of the remote network (as
defined by a subnet or by a range of IP addresses), or a single PC?
• Will either endpoint use Fully Qualified Domain Names (FQDNs)? Many DSL accounts are
provisioned with DHCP addressing, where the IP address of the WAN port can change from
time to time. Under these circumstances, configuring the WAN port with a dynamic DNS
(DynDNS) service provider simplifies the configuration task. When DynDNS is configured on
the WAN port, configure the VPN using FDQN.
VPN Gateway A
VPN Gateway B
VPN Tunnel
PCs
PCs
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