added shell command to get gateway IP address

opnsense-carp-dhcp.php

@@ -64,8 +64,13 @@ filter_configure_sync(true);
 
 # DHCP ip address and gateway address
 
-/*
+
 # Config for WAN Static
+exec(sprintf('netstat -rn | grep "default"| awk \'{print $2;}\'', $gatewayIP);
+print($gatewayIP);
+
+/*
+
 $config['interfaces'][$interface]['ipaddr'] = '192.168.101.1';
 $config['interfaces'][$interface]['subnet'] = '30';
 $config['interfaces'][$interface]['gateway'] = 'WAN_GW';
@@ -86,4 +91,3 @@ plugins_configure('monitor', true);
 filter_configure_sync(true);
 
 */
-