From b38a1bb39a5aa1984aee9f133fb42a44493b2e7d Mon Sep 17 00:00:00 2001
From: Nikos Mavrogiannopoulos <nmav@gnutls.org>
Date: Fri, 26 Dec 2014 20:23:12 +0200
Subject: [PATCH] override the default ipv6_prefix only if ipv6_prefix is set

---
 src/worker-auth.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/worker-auth.c b/src/worker-auth.c
index e8d01d22..210580c4 100644
--- a/src/worker-auth.c
+++ b/src/worker-auth.c
@@ -557,7 +557,9 @@ static int recv_cookie_auth_reply(worker_st * ws)
 				    talloc_strdup(ws, msg->ipv6_network);
 			}
 
-			ws->config->network.ipv6_prefix = msg->ipv6_prefix;
+			if (msg->has_ipv6_prefix) {
+				ws->config->network.ipv6_prefix = msg->ipv6_prefix;
+			}
 
 			if (msg->has_rx_per_sec)
 				ws->config->rx_per_sec = msg->rx_per_sec;