Cisco SA520-K9 Administration Guide - Page 59

Networking Configuring the Optional WAN 2 When the security appliance is configured in Load Balancing mode, it checks the connection of both the links at regular intervals to detect the status. NOTE You can click the Protocol Bindings link to view, add, or edit the protocol bindings, but save your settings on this page first. • Use only single WAN port: Choose this option if you are connected to only one ISP. Also select the WAN port that is connected to your ISP: Dedicated WAN or Optional WAN. This option may be useful for debugging connection issues. STEP 3 If you chose Auto-Rollover or Load Balancing for the Port Mode, configure the WAN Failure Detection Method: • None: Choose this option to have no check for detecting WAN failure. This option is valid only if the port mode is set to Load Balancing. • DNS lookup using WAN DNS Servers: Choose this option to detect a failure of a WAN link by using the DNS servers that are configured for the Dedicated WAN or Optional Port WAN. • DNS lookup using these DNS Servers: Choose this option to detect a failure of a WAN link by using the DNS servers that you specify in the fields below. - Dedicated WAN: Enter the IP address of the DNS servers for the Dedicated WAN. - Optional WAN: Enter the IP address of the DNS server for the WAN interface on the Optional port. • Ping these IP addresses: Choose this option to detect WAN failure by pinging the IP addresses that you specify in the fields below. - Dedicated WAN: Enter a valid IP address to ping from the Dedicated WAN. - Optional WAN: Enter a valid IP address to ping from the WAN interface on the Optional port. • Retry Interval is: Specify how often, in seconds, the security appliance should run the above configured failure detection method. • Failover after: Specify the number of retries after which failover is initiated. STEP 4 Click Apply to save your settings. Cisco SA500 Series Security Appliances Administration Guide 59