Casio ISA550WBUN3K9 manual Configuring Network Failure Detection

Configuration Wizards	2
Using the Dual WAN Wizard to Configure WAN Redundancy Settings

-Weighted by Link Bandwidth: If you choose this option, specify the amount of bandwidth for each WAN, such as 80 Mbps for WAN1 and 20 Mbps for WAN2, which indicates that 80% bandwidth is distributed to WAN1 and at least 20% bandwidth is distributed to WAN2.

NOTE: The Weighted by Link Bandwidth option has the same effect with the Weighted by Percentage option. It just provides more percentage options than Weighted by Percentage that only provides three percentage options.

•Failover: Choose this option if you want to use one ISP link as a backup. The Failover mode directs all Internet traffic to the secondary link if the primary link is down. When the primary link regains connectivity, all Internet traffic is directed to the primary link and the secondary link becomes idle.

-Select WAN Precedence: Choose one of the following options:

Primary: WAN1; Secondary: WAN2: If you choose this option, WAN1 is set as the primary link and WAN2 is set as the backup link.

Primary: WAN2; Secondary: WAN1: If you choose this option, WAN2 is set as the primary link and WAN1 is set as the backup link.

-Preempt Delay Timer: Enter the time in seconds that the security appliance will preempt the primary link from the backup link after the primary link is up again. The default is 5 seconds.

STEP 10 After you are finished, click Next.

Configuring Network Failure Detection

STEP 11 Use the Network Detection page to configure network failure detection.

•Retry Count: Enter the number of retries. The security appliance repeatedly tries to connect to the ISP after the network failure is detected.

•Retry Timeout: Enter the interval value between two detection packets (Ping or DNS detection).

•Ping Detection-Ping using WAN Default Gateway: If you choose this option, ping the IP address of the default WAN gateway. If the default WAN gateway can be detected, the network connection is active.

•DNS Detection-DNS lookup using WAN DNS Servers: If you choose this option, the security appliance sends the DNS query for www.cisco.com to the default WAN DNS server. If the DNS server can be detected, the network connection is active.

Cisco ISA500 Series Integrated Security Appliances Administration Guide 53