fixWin2.patch

diff --git a/accel-pppd/ctrl/ipoe/ipoe.c b/accel-pppd/ctrl/ipoe/ipoe.c
index b8082a6..0bb63af 100644
--- a/accel-pppd/ctrl/ipoe/ipoe.c
+++ b/accel-pppd/ctrl/ipoe/ipoe.c
@@ -116,6 +116,7 @@ static int conf_ifcfg = 1;
 static int conf_nat;
 static int conf_arp;
 static int conf_ipv6;
+static int conf_check_time_old_request;
 static uint32_t conf_src;
 static const char *conf_ip_pool;
 static const char *conf_l4_redirect_pool;
@@ -1808,6 +1809,14 @@ static void __ipoe_recv_dhcpv4(struct dhcpv4_serv *dhcpv4, struct dhcpv4_packet
 				dhcpv4_print_packet(pack, 0, log_debug);
 			}
 
+			if(conf_check_time_old_request){
+				if(pack->hdr->sec >= conf_check_time_old_request){
+					log_debug("%s: old request detected\n", serv->ifname);
+					dhcpv4_send_nak(dhcpv4, pack);
+					goto out;
+				}
+			}
+
 			if (pack->src_addr) {
 				dhcpv4_send_nak(dhcpv4, pack);
 				goto out;
@@ -3925,6 +3934,12 @@ static void load_config(void)
 	else
 		conf_weight = 0;
 
+	opt = conf_get_opt("ipoe", "check-time-old-request");
+	if (opt)
+		conf_check_time_old_request = atoi(opt);
+	else
+		conf_check_time_old_request = 0;
+
 #ifdef RADIUS
 	if (triton_module_loaded("radius"))
 		load_radius_attrs();