diff -Nabdur bind-9.6.0-P1.orig/bin/named/config.c bind-9.6.0-P1/bin/named/config.c
--- bin/named/config.c	2009-05-22 12:24:49.000000000 +0400
+++ bin/named/config.c	2009-05-22 12:31:35.000000000 +0400
@@ -129,6 +129,8 @@
 	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\
diff -Nabdur bind-9.6.0-P1.orig/bin/named/server.c bind-9.6.0-P1/bin/named/server.c
--- bin/named/server.c	2009-05-22 12:24:49.000000000 +0400
+++ bin/named/server.c	2009-05-22 12:32:18.000000000 +0400
@@ -1727,6 +1727,16 @@
 		CHECK(mustbesecure(obj, view->resolver));
 
 	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);
diff -Nabdur bind-9.6.0-P1.orig/lib/dns/include/dns/view.h bind-9.6.0-P1/lib/dns/include/dns/view.h
--- lib/dns/include/dns/view.h	2009-05-22 12:24:49.000000000 +0400
+++ lib/dns/include/dns/view.h	2009-05-22 12:29:03.000000000 +0400
@@ -131,6 +131,8 @@
 	isc_boolean_t			provideixfr;
 	isc_boolean_t			requestnsid;
 	dns_ttl_t			maxcachettl;
+	dns_ttl_t			mincachettl;
+	dns_ttl_t			overridecachettl;
 	dns_ttl_t			maxncachettl;
 	in_port_t			dstport;
 	dns_aclenv_t			aclenv;
diff -Nabdur bind-9.6.0-P1.orig/lib/dns/resolver.c bind-9.6.0-P1/lib/dns/resolver.c
--- lib/dns/resolver.c	2009-05-22 12:24:49.000000000 +0400
+++ lib/dns/resolver.c	2009-05-22 12:30:41.000000000 +0400
@@ -4054,6 +4054,18 @@
 		}
 
 		/*
+		 * 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)
diff -Nabdur bind-9.6.0-P1.orig/lib/isccfg/namedconf.c bind-9.6.0-P1/lib/isccfg/namedconf.c
--- lib/isccfg/namedconf.c	2009-05-22 12:24:49.000000000 +0400
+++ lib/isccfg/namedconf.c	2009-05-22 12:31:21.000000000 +0400
@@ -821,6 +821,8 @@
 	{ "lame-ttl", &cfg_type_uint32, 0 },
 	{ "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 },