From f968f649e7e57eb097fb766be805a2d976d2dcc6 Mon Sep 17 00:00:00 2001
From: Petr Mensik <pemensik@redhat.com>
Date: Wed, 27 Nov 2019 16:06:12 +0100
Subject: [PATCH] Disable listening on IPV6 by default

If configuration file does not mention listen-on-v6, for backward
compatibility assume none; Upstream changed default value to any; but
previous RHEL7 version did not have it.
---
 bin/named/server.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/bin/named/server.c b/bin/named/server.c
index 93f9417..eac467f 100644
--- a/bin/named/server.c
+++ b/bin/named/server.c
@@ -7781,11 +7781,13 @@ load_configuration(const char *filename, ns_server_t *server,
 						       ns_g_mctx, AF_INET6,
 						       &listenon);
 		} else if (!ns_g_lwresdonly) {
+			isc_boolean_t enable;
 			/*
 			 * Not specified, use default.
 			 */
+			enable = ISC_TF(isc_net_probeipv4() != ISC_R_SUCCESS);
 			CHECK(ns_listenlist_default(ns_g_mctx, listen_port,
-						    -1, ISC_TRUE, &listenon));
+						    -1, enable, &listenon));
 		}
 		if (listenon != NULL) {
 			ns_interfacemgr_setlistenon6(server->interfacemgr,
-- 
2.20.1