ProSafe 802.11g Wireless VPN Firewall FVG318 Reference Manual
Basic Virtual Private Networking 5-3
v1.0, September 2007
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 FVG318s on each end of the tunnel to form the VPN
tunnel end points. See “Setting Up a Gateway-to-Gateway VPN Configuration” on page 5-19 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.
FQDNs supplied by Dynamic DNS providers can allow a VPN endpoint with a dynamic IP
address to initiate or respond to a tunnel request. Otherwise, the side using a dynamic IP
address must always be the initiator.
• What method will you use to configure your VPN tunnels?
– The VPN Wizard using VPNC defaults (see Tab le 5-1)
– Advanced methods (see Chapter 6, “Advanced Virtual Private Networking”)
Tabl e 5-1. Parameters recommended by the VPNC and used in the VPN Wizard
Parameter Factory Default
Secure Association Main Mode
Authentication Method Pre-shared Key
Encryption Method 3DES