This testvar must be explicitly defined in the configuration file
This parameter specifies the IPv4 address of the gateway assigned by CDRouter to the CM’s DHCP client on the WAN. This testvar is only used in configurations where DHCP relay is required or present.
If not specified, CDRouter will provide the value of the testvar docsisIp as the gateway to the CM’s DHCP client on the WAN.
This testvar was added in CDRouter 10.3