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Configuring a Site-to-Site VPN
Cisco ISA500 Series Integrated Security Appliances Administration Guide 348
8
• SA-Lifetime: Enter the lifetime of the IPsec Security Association (SA). The
IPsec SA lifetime represents the interval after which the IPsec SA becomes
invalid. The IPsec SA is renegotiated after this interval. The default value is 1
hour.
STEP 5 In the VPN Failover tab, enter the following information:
• WAN Failover Enable: Click On to enable WAN Failover for site-to-site VPN,
or click Off to disable it. If you enable WAN Failover, the backup WAN port
ensures that VPN traffic rolls over to the backup link whenever the primary
link fails. The security appliance will automatically update the local WAN
gateway for the VPN tunnel based on the configurations of the backup WAN
link. For this purpose, Dynamic DNS has to be configured because the IP
address will change due to failover, or let the remote gateway use dynamic
IP address.
NOTE: To enable WAN Failover for site-to-site VPN, make sure that the
secondary WAN port was configured and the WAN redundancy was set as
the Failover or Load Balancing mode.
• Redundant Gateway: Click On to enable Redundant Gateway, or click Off to
disable it. If you enable Redundant Gateway, when the connection of the
remote gateway fails, the backup connection automatically becomes active.
A backup policy comes into effect only if the primary policy fails.
- Select Backup Policy: Choose a policy to act as a backup of this policy.
- Fallback Time to switch from back-up to primary: Enter the number of
seconds that must pass to confirm that the primary tunnel has recovered
from a failure. If the primary tunnel is up for the specified time, the
security appliance will switch to the primary tunnel by disabling the
backup tunnel. Enter a value in the range 3 to 59 seconds. The default
value is 5 seconds.
NOTE: DPD should be enabled if you want to use the Redundant
Gateway feature for IPsec VPN connection.
STEP 6 Click OK to save your settings.
STEP 7 When both the Site-to-Site VPN feature and the IPsec VPN policy are enabled, a
warning message appears saying “Do you want to make this connection active
when the settings are saved?”
• If you want to immediately activate the connection after the settings are
saved, click the Activate Connection button. After you save your settings,
the security appliance will immediately try to initiate the VPN connection.
You can check the Status column to view its connection status.