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ProSecure Unified Threat Management (UTM) Appliance Reference Manual
7-38 Virtual Private Networking Using IPsec Connections
v1.0, January 2010
5. Click Apply to save your settings. The VPN policy is added to the List of VPN Policies table.
To edit a VPN policy:
1. Select VPN > IPSec VPN from the menu. The IPsec VPN submenu tabs appear with the IKE
Policies screen in view.
2. Click the VPN Policies submenu tab. The VPN Policies screen displays (see Figure 7-22 on
page 7-32).
3. In the List of VPN Policies table, click the Edit table button to the right of the VPN policy that
you want to edit. The Edit VPN Policy screen displays. This screen shows the same field as the
Add VPN Policy screen (see Figure 7-23 on page 7-34).
4. Modify the settings that you wish to change (see Table 7-12).
5. Click Apply to save your changes. The modified VPN policy is displayed in the List of VPN
Policies table.
Configuring Extended Authentication (XAUTH)
When many VPN clients connect to a UTM, you might want to use a unique user authentication
method beyond relying on a single common pre-shared key for all clients. Although you could
configure a unique VPN policy for each user, it is more efficient to authenticate users from a stored
list of user accounts. XAUTH provides the mechanism for requesting individual authentication
information from the user, and a local user database or an external authentication server, such as a
RADIUS server, provides a method for storing the authentication information centrally in the local
network.
PFS Key Group Select this checkbox to enable Perfect Forward Secrecy (PFS), and then
select a Diffie-Hellman (DH) group from the pull-down menu. The DH Group
sets the strength of the algorithm in bits. The higher the group, the more
secure the exchange. From the pull-down menu, select one of the following
three strengths:
• Group 1 (768 bit).
• Group 2 (1024 bit). This is the default setting.
• Group 5 (1536 bit).
Select IKE Policy Select an existing IKE policy that defines the characteristics of the Phase-1
negotiation. Click the view selected button to display the selected IKE
policy.
Table 7-12. Add VPN Policy Settings (continued)
Item Description (or Subfield and Description)