pfSense

		/* 

		 * NOTE: The code below is meant to replace the default gateway when it goes down.

		 *	This facilitates services running on pfSense itself and are not handled by a PBR to continue working.

		 */

		$upgw = "";

		$dfltgwdown = false;

		$dfltgwfound = false;

		foreach ($gateways_arr as $gwname => $gwsttng) {

			if (isset($gwsttng['defaultgw'])) {

				$dfltgwfound = true;

				$dfltgwname = $gwname;

				if (stristr($gateways_status[$gwname]['status'], "down"))

					$dfltgwdown = true;

			}

			/* Keep a record of the last up gateway */

			if (empty($upgw) && !stristr($gateways_status[$gwname]['status'], "down"))

				$upgw = $gwname;

			if ($dfltgwdown == true && !empty($upgw))

				break;

		}

		if ($dfltgwfound == false) {

			$gwname = convert_friendly_interface_to_friendly_descr("wan");

		if ($dfltgwdown == true && !empty($upgw)) {

			if ($gateways_arr[$upgw]['gateway'] == "dynamic")

				$gateways_arr[$upgw]['gateway'] = get_interface_gateway($gateways_arr[$upgw]['friendlyiface']);

			if (is_ipaddr($gateways_arr[$upgw]['gateway'])) {

				log_error("Default gateway down setting {$upgw} as default!");

				mwexec("/sbin/route delete -inet default; /sbin/route add -inet default {$gateways_arr[$upgw]['gateway']}");

			}

		} else {

			$defaultgw = trim(`/sbin/route -n get -inet default | /usr/bin/grep gateway | /usr/bin/sed 's/gateway://g'`, " \n");

			if ($defaultgw != $gateways_arr[$dfltgwname]['gateway'])

				mwexec("/sbin/route delete -inet default; /sbin/route add -inet default {$gateways_arr[$dfltgwname]['gateway']}");

		unset($upgw, $dfltgwfound, $dfltgwdown, $gwname, $gwsttng);