diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index 0addd45..39c65a2 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -56,6 +56,9 @@ struct net {
 	struct list_head 	dev_base_head;
 	struct hlist_head 	*dev_name_head;
 	struct hlist_head	*dev_index_head;
+	/* fast consecutive name allocation (e.g. eth0, eth1, ...) */
+	char                    fcna_name[IFNAMSIZ];
+	int                     fcna_no;
 
 	/* core fib_rules */
 	struct list_head	rules_ops;
diff --git a/net/core/dev.c b/net/core/dev.c
index ad8e320..008e3c7 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -226,8 +226,12 @@ static int list_netdevice(struct net_device *dev)
  */
 static void unlist_netdevice(struct net_device *dev)
 {
+	struct net *net = dev_net(dev);
+
 	ASSERT_RTNL();
 
+	net->fcna_no = -1;
+
 	/* Unlink dev from the device chain */
 	write_lock_bh(&dev_base_lock);
 	list_del_rcu(&dev->dev_list);
@@ -872,6 +876,16 @@ static int __dev_alloc_name(struct net *net, const char *name, char *buf)
 		if (p[1] != 'd' || strchr(p + 2, '%'))
 			return -EINVAL;
 
+		/* avoid fast allocation for strange templates like "fan%dcy" */
+		if (net->fcna_no >= 0 && p[2] == 0 &&
+		    net->fcna_name[p - name] == 0 &&
+		    memcmp(name, net->fcna_name, p - name) == 0) {
+			snprintf(buf, IFNAMSIZ, name, ++net->fcna_no);
+			if (!__dev_get_by_name(net, buf))
+				return net->fcna_no;
+			net->fcna_no = -1;
+		}
+
 		/* Use one page as a bit array of possible slots */
 		inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
 		if (!inuse)
@@ -894,8 +908,15 @@ static int __dev_alloc_name(struct net *net, const char *name, char *buf)
 	}
 
 	snprintf(buf, IFNAMSIZ, name, i);
-	if (!__dev_get_by_name(net, buf))
+	if (!__dev_get_by_name(net, buf)) {
+		if (p[2] == 0) {
+			memcpy(net->fcna_name, name, p - name);
+			net->fcna_name[p - name] = 0;
+			net->fcna_no = i;
+		}  else
+			net->fcna_no = -1;
 		return i;
+	}
 
 	/* It is possible to run out of possible slots
 	 * when the name is long and there isn't enough space left