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	/*
	 * RFC 2132, section 9.7
	 *   DHCP clients use the contents of the 'server identifier' field
	 *   as the destination address for any DHCP messages unicast to
	 *   the DHCP server.
	 *
	 * Some ISP's provide leases from central servers that are on
	 * different subnets that the address offered.  If the host
	 * does not configure the interface as the default route, the
	 * dhcp server may not be reachable via unicast, and a host
	 * specific route is needed.
	 **/
	str = g_hash_table_lookup (options, "dhcp_server_identifier");
	if (str) {
		if (inet_pton (AF_INET, str, &tmp_addr) > 0) {

			nm_log_info (LOGD_DHCP4, "  server identifier %s", str);
			if (   nm_utils_ip4_address_clear_host_address(tmp_addr, address.plen) != nm_utils_ip4_address_clear_host_address(address.address, address.plen)
			    && !nm_ip4_config_get_direct_route_for_host (ip4_config, tmp_addr)) {
				/* DHCP server not on assigned subnet and the no direct route was returned. Add route */
				NMPlatformIP4Route route = { 0 };

				route.network = tmp_addr;
				route.plen = 32;
				/* this will be a device route if gwaddr is 0 */
				route.gateway = gwaddr;
				route.source = NM_IP_CONFIG_SOURCE_DHCP;
				route.metric = priority;
				nm_ip4_config_add_route (ip4_config, &route);
				nm_log_dbg (LOGD_IP, "adding route for server identifier: %s",
				                      nm_platform_ip4_route_to_string (&route));
			}
		}
		else
			nm_log_warn (LOGD_DHCP4, "ignoring invalid server identifier '%s'", str);
	}