For some NAT timer implementations, you may need to configure the testvar natLagTime. This value represents the number of seconds CDRouter will wait before checking that a NAT timer has expired. If an implementation only checks the NAT timers periodically, the actual value of a specific NAT timer may vary. The testvar natLagTime allows the NAT timer to be within a range. For example, if the NAT timers are only checked once per minute, the testvar natLagTime should be set to 60.