Quick Reference Guide

ProSafe VPN Firewall 50 FVS338 Reference Manual
5-18 Virtual Private Networking
v1.0, January 2010
To gain a more complete understanding of the encryption, authentication and DH algorithm
technologies, see Appendix D, “Related Documents.”
Configuring VPN Policies
You can create two types of VPN Policies. When using the VPN Wizard to create a VPN policy,
only the Auto method is available.
• Manual. All settings (including the keys) for the VPN tunnel are manually entered at each end
(both VPN endpoints). No third-party server or organization is involved.
• Auto. Some parameters for the VPN tunnel are generated automatically by using the IKE
(Internet Key Exchange) protocol to perform negotiations between the two VPN endpoints
(the Local ID Endpoint and the Remote ID Endpoint).
In addition, a CA (Certificate Authority) can also be used to perform authentication (see
“Managing Certificates” on page 5-19). To use a CA, each VPN gateway must have a certificate
from the CA. For each certificate, there is both a public key and a private key. The public key is
freely distributed, and is used by any sender to encrypt data intended for the receiver (the key
owner). The receiver then uses its private key to decrypt the data (without the private key,
decryption is impossible). The use of certificates for authentication reduces the amount of data
entry required on each VPN endpoint.
The VPN Policies Screen
The VPN Policies screen (see Figure 5-8 on page 5-8) allows you to add additional policies—
either Auto or Manual—and to manage the VPN policies already created. You can edit policies,
enable or disable them, or delete them entirely. The rules for VPN policy use conform to:
1. Traffic covered by a policy will automatically be sent via a VPN tunnel.
2. When traffic is covered by two or more policies, the first matching policy will be used. (In this
situation, the order of the policies is important. However, if you have only one policy for each
remote VPN Endpoint, then the policy order is not important.)
3. The VPN tunnel is created according to the parameters in the SA (Security Association).
4. The remote VPN endpoint must have a matching SA, or it will refuse the connection.
Only one client policy may configured at a time (noted by an “*” next to the policy name). The
List of VPN Policies contains the following fields:
• ! (Status). Indicates whether the policy is enabled (green circle) or disabled (grey circle). To
enable or disable a policy, check the radio box adjacent to the circle and click enable or
disable, as required.