--- bin/named/config.c.orig	2017-04-14 03:54:11 UTC
+++ bin/named/config.c
@@ -154,6 +154,8 @@ options {\n\
 	min-roots 2;\n\
 	lame-ttl 600;\n\
 	max-ncache-ttl 10800; /* 3 hours */\n\
+       override-cache-ttl 0; /* do not override */\n\
+       min-cache-ttl 0; /* no minimal, zero is allowed */\n\
 	max-cache-ttl 604800; /* 1 week */\n\
 	transfer-format many-answers;\n\
 	max-cache-size 0;\n\
--- bin/named/server.c.orig	2017-04-14 03:54:11 UTC
+++ bin/named/server.c
@@ -2890,6 +2890,16 @@ configure_view(dns_view_t *view, dns_vie
 	}
 
 	obj = NULL;
+	result = ns_config_get(maps, "override-cache-ttl", &obj);
+	INSIST(result == ISC_R_SUCCESS);
+	view->overridecachettl = cfg_obj_asuint32(obj);
+
+	obj = NULL;
+	result = ns_config_get(maps, "min-cache-ttl", &obj);
+	INSIST(result == ISC_R_SUCCESS);
+	view->mincachettl = cfg_obj_asuint32(obj);
+
+	obj = NULL;
 	result = ns_config_get(maps, "max-cache-ttl", &obj);
 	INSIST(result == ISC_R_SUCCESS);
 	view->maxcachettl = cfg_obj_asuint32(obj);
--- lib/dns/include/dns/view.h.orig	2017-04-14 03:54:11 UTC
+++ lib/dns/include/dns/view.h
@@ -151,6 +151,8 @@ struct dns_view {
 	isc_boolean_t			requestnsid;
 	isc_boolean_t			requestsit;
 	dns_ttl_t			maxcachettl;
+	dns_ttl_t			mincachettl;
+	dns_ttl_t			overridecachettl;
 	dns_ttl_t			maxncachettl;
 	dns_ttl_t			prefetch_trigger;
 	dns_ttl_t			prefetch_eligible;
--- lib/dns/resolver.c.orig	2017-04-14 03:54:11 UTC
+++ lib/dns/resolver.c
@@ -5378,6 +5378,18 @@ cache_name(fetchctx_t *fctx, dns_name_t 
 		}
 
 		/*
+		 * Enforce the configure cache TTL override.
+		 */
+                if (res->view->overridecachettl)
+                        rdataset->ttl = res->view->overridecachettl;
+
+		/*
+		 * Enforce the configure minimum cache TTL.
+		 */
+                if (rdataset->ttl < res->view->mincachettl)
+                        rdataset->ttl = res->view->mincachettl;
+
+		/*
 		 * Enforce the configure maximum cache TTL.
 		 */
 		if (rdataset->ttl > res->view->maxcachettl)
--- lib/isccfg/namedconf.c.orig	2017-04-14 03:54:11 UTC
+++ lib/isccfg/namedconf.c
@@ -1591,6 +1591,8 @@ view_clauses[] = {
 #endif
 	{ "max-acache-size", &cfg_type_sizenodefault, 0 },
 	{ "max-cache-size", &cfg_type_sizenodefault, 0 },
+	{ "override-cache-ttl", &cfg_type_uint32, 0 },
+	{ "min-cache-ttl", &cfg_type_uint32, 0 },
 	{ "max-cache-ttl", &cfg_type_uint32, 0 },
 	{ "max-clients-per-query", &cfg_type_uint32, 0 },
 	{ "max-ncache-ttl", &cfg_type_uint32, 0 },