From 439250701949f9fd85b326125efa9ba2dd673cdb Mon Sep 17 00:00:00 2001
From: Simon Duquennoy <simon.duquennoy@inria.fr>
Date: Wed, 27 Apr 2016 14:19:26 +0200
Subject: [PATCH] RPL: do not add K flag to no-path DAO as we discard the ACK
 anyway

---
 core/net/rpl/rpl-icmp6.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/core/net/rpl/rpl-icmp6.c b/core/net/rpl/rpl-icmp6.c
index 0f20ddb67..c6f9e160d 100644
--- a/core/net/rpl/rpl-icmp6.c
+++ b/core/net/rpl/rpl-icmp6.c
@@ -1050,7 +1050,9 @@ dao_output_target_seq(rpl_parent_t *parent, uip_ipaddr_t *prefix,
   buffer[pos] |= RPL_DAO_D_FLAG;
 #endif /* RPL_DAO_SPECIFY_DAG */
 #if RPL_WITH_DAO_ACK
-  buffer[pos] |= RPL_DAO_K_FLAG;
+  if(lifetime != RPL_ZERO_LIFETIME) {
+    buffer[pos] |= RPL_DAO_K_FLAG;
+  }
 #endif /* RPL_WITH_DAO_ACK */
   ++pos;
   buffer[pos++] = 0; /* reserved */