Netgear SRX5308 SRX5308 Reference Manual - Page 171

ProSafe Gigabit Quad WAN SSL VPN Firewall SRX5308 Reference Manual 3. Modify the settings that you wish to change (see Table 5-10 on page 5-25). 4. Click Apply to save your changes. The modified IKE policy is displayed in the List of IKE Policies table. Configuring VPN Policies You can create two types of VPN policies. When you use the VPN Wizard to create a VPN policy, only the Auto method is available. • Manual. You manually enter all settings (including the keys) for the VPN tunnel on the VPN firewall and on the remote VPN endpoint. No third-party server or organization is involved. • Auto. Some settings 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). You still must manually enter all settings on the remote VPN endpoint (unless the remote VPN endpoint also has a VPN Wizard). In addition, a Certificate Authority (CA) can also be used to perform authentication (see "Managing Digital Certificates" on page 7-17). 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 that is required on each VPN endpoint. VPN Policies Screen 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. These are the rules for VPN policy use: 1. Traffic covered by a policy is automatically sent via a VPN tunnel. 2. When traffic is covered by two or more policies, the first matching policy is 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 settings in the security association (SA). 4. The remote VPN endpoint must have a matching SA, otherwise it refuses the connection. To access the VPN Policies screen: 1. Select VPN > IPSec VPN from the menu. The IPsec VPN submenu tabs display, with the IKE Policies screen in view (see Figure 5-20 on page 5-22). Virtual Private Networking Using IPsec Connections v1.0, April 2010 5-29