ZyXEL Communications P-661HW manual 93

P-661H/HW Series User’s Guide

Figure 45 WAN Backup Setup

The following table describes the labels in this screen.

Table 29 WAN Backup Setup

LABEL	DESCRIPTION
Backup Type	Select the method that the ZyXEL Device uses to check the DSL connection.
	Select DSL Link to have the ZyXEL Device check if the connection to the DSLAM is
	up. Select ICMP to have the ZyXEL Device periodically ping the IP addresses
	configured in the Check WAN IP Address fields.
Check WAN IP	Configure this field to test your ZyXEL Device's WAN accessibility. Type the IP
Address1-3	address of a reliable nearby computer (for example, your ISP's DNS server
	address).

	Note: If you activate either traffic redirect or dial backup, you must
	configure at least one IP address here.
	When using a WAN backup connection, the ZyXEL Device periodically pings the
	addresses configured here and uses the other WAN backup connection (if
	configured) if there is no response.
Fail Tolerance	Type the number of times (2 recommended) that your ZyXEL Device may ping the
	IP addresses configured in the Check WAN IP Address field without getting a
	response before switching to a WAN backup connection (or a different WAN backup
	connection).
Recovery Interval	When the ZyXEL Device is using a lower priority connection (usually a WAN backup
	connection), it periodically checks to whether or not it can use a higher priority
	connection.
	Type the number of seconds (30 recommended) for the ZyXEL Device to wait
	between checks. Allow more time if your destination IP address handles lots of
	traffic.
Timeout	Type the number of seconds (3 recommended) for your ZyXEL Device to wait for a
	ping response from one of the IP addresses in the Check WAN IP Address field
	before timing out the request. The WAN connection is considered "down" after the
	ZyXEL Device times out the number of times specified in the Fail Tolerance field.
	Use a higher value in this field if your network is busy or congested.

Chapter 4 WAN Setup 93