Related Topics
Depending on the type of router you are using, failover may or may not be advisable. For example, failover across a NAT router is not advisable, because you would only be able to monitor the IP address of the NAT, not the IP address of the source. In that case, failover would occur when the NAT router was unavailable, not when the source was unavailable.
Failover across a firewall can be performed. By default, a destination host unreachable message will trigger failover. If you do not desire this functionality, it can be disabled using the FailoverOnRouteFailure server setting. See the Scripting Guide for more information on this option.