From f444cddbafa77ee415b3b44efd2dd6e2b3c59498 Mon Sep 17 00:00:00 2001
From: Simon Kelley <simon@thekelleys.org.uk>
Date: Wed, 7 Mar 2012 10:15:57 +0000
Subject: [PATCH] Don't waste time calculating EUI-64 when a lease doesn't have
 a name.

---
 src/lease.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/lease.c b/src/lease.c
index b9dbe7f..8271963 100644
--- a/src/lease.c
+++ b/src/lease.c
@@ -410,7 +410,7 @@ void lease_update_dns(void)
 #ifdef HAVE_DHCP6
 	  if (lease->flags & (LEASE_TA | LEASE_NA))
 	    prot = AF_INET6;
-	  else
+	  else if (lease->hostname || lease->fqdn)
 	    {
 	      struct subnet_map *map;
 	      for (map = subnets; map; map = map->next)