Netgear FVX538v1 FVX538 Reference Manual - Page 121

ProSafe VPN Firewall 200 FVX538 Reference Manual • DH. Diffie-Hellman Group. The Diffie-Hellman algorithm is used when exchanging keys. The DH Group sets the number of bits. The VPN Wizard default setting is Group 2. (This setting must match the Remote VPN.) • Enable Dead Peer Detection: Dead Peer Detection is used to detect whether the peer is alive or not. If the peer is detected as dead, the IPSec and IKE Security Association are deleted. To gain a more complete understanding of the encryption, authentication and DH algorithm technologies, see Appendix D, "Related Documents" for a link to the NETGEAR website. VPN Policy 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 input 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 "Certificate Authorities" 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 to encrypt data. The receiver then uses their "Private Key" to decrypt the data (without the Private Key, decryption is impossible). CAs can be beneficial since using them reduces the amount of data entry required on each VPN Endpoint. Managing VPN Policies The VPN Policies screen 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 policies, or delete them entirely. The rules for VPN policy use are: 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. Virtual Private Networking v1.0, March 2009 5-17