diff --git a/bin/named/include/named/globals.h b/bin/named/include/named/globals.h
index b308a6b5a9..045beaf43d 100644
--- a/bin/named/include/named/globals.h
+++ b/bin/named/include/named/globals.h
@@ -49,7 +49,7 @@ EXTERN isc_timermgr_t *		ns_g_timermgr		INIT(NULL);
 EXTERN isc_socketmgr_t *	ns_g_socketmgr		INIT(NULL);
 EXTERN omapi_object_t *		ns_g_omapimgr		INIT(NULL);
 EXTERN const char *		ns_g_version		INIT(VERSION);
-EXTERN in_port_t		ns_g_port		INIT(53);
+EXTERN in_port_t		ns_g_port		INIT(0);
 
 EXTERN ns_server_t *		ns_g_server		INIT(NULL);
 
diff --git a/bin/named/include/named/interfacemgr.h b/bin/named/include/named/interfacemgr.h
index d0535217d5..871b090819 100644
--- a/bin/named/include/named/interfacemgr.h
+++ b/bin/named/include/named/interfacemgr.h
@@ -90,6 +90,13 @@ ns_interfacemgr_create(isc_mem_t *mctx, isc_taskmgr_t *taskmgr,
 		       isc_socketmgr_t *socketmgr,
 		       dns_dispatchmgr_t *dispatchmgr,
 		       ns_clientmgr_t *clientmgr, ns_interfacemgr_t **mgrp);
+/*
+ * Create a new interface manager.
+ *
+ * Initially, the new manager will not listen on any interfaces.
+ * Call ns_interfacemgr_setlistenon() and/or ns_interfacemgr_setlistenon6()
+ * to set nonempty listen-on lists.
+ */
 
 void
 ns_interfacemgr_attach(ns_interfacemgr_t *source, ns_interfacemgr_t **target);
@@ -113,10 +120,17 @@ ns_interfacemgr_scan(ns_interfacemgr_t *mgr);
  */
 
 void
-ns_interfacemgr_setlistenon(ns_interfacemgr_t *mgr, ns_listenlist_t *value);
+ns_interfacemgr_setlistenon4(ns_interfacemgr_t *mgr, ns_listenlist_t *value);
 /*
- * Set the "listen-on" list of 'mgr' to 'value'.
- * The previous listen-on list is freed.
+ * Set the IPv4 "listen-on" list of 'mgr' to 'value'.
+ * The previous IPv4 listen-on list is freed.
+ */
+
+void
+ns_interfacemgr_setlistenon6(ns_interfacemgr_t *mgr, ns_listenlist_t *value);
+/*
+ * Set the IPv6 "listen-on" list of 'mgr' to 'value'.
+ * The previous IPv6 listen-on list is freed.
  */
 
 isc_result_t
diff --git a/bin/named/include/named/listenlist.h b/bin/named/include/named/listenlist.h
index 00ab6cbc06..8066a809e7 100644
--- a/bin/named/include/named/listenlist.h
+++ b/bin/named/include/named/listenlist.h
@@ -60,18 +60,33 @@ struct ns_listenlist {
 isc_result_t
 ns_listenelt_create(isc_mem_t *mctx, in_port_t port,
 		    dns_acl_t *acl, ns_listenelt_t **target);
+/*
+ * Create a listen-on list element.
+ */
 
 void
 ns_listenelt_destroy(ns_listenelt_t *elt);
+/*
+ * Destroy a listen-on list element.
+ */
 
 isc_result_t
 ns_listenlist_create(isc_mem_t *mctx, ns_listenlist_t **target);
+/*
+ * Create a new, empty listen-on list.
+ */
 
 void
 ns_listenlist_attach(ns_listenlist_t *source, ns_listenlist_t **target);
+/*
+ * Attach '*target' to '*source'.
+ */
 
 void
 ns_listenlist_detach(ns_listenlist_t **listp);
+/*
+ * Detach 'listp'.
+ */
 
 isc_result_t
 ns_listenlist_default(isc_mem_t *mctx, in_port_t port,
diff --git a/bin/named/interfacemgr.c b/bin/named/interfacemgr.c
index 46c2597895..67a1bba3da 100644
--- a/bin/named/interfacemgr.c
+++ b/bin/named/interfacemgr.c
@@ -45,7 +45,8 @@ struct ns_interfacemgr {
 	dns_dispatchmgr_t *	dispatchmgr;
 	ns_clientmgr_t *	clientmgr;	/* Client manager. */
 	unsigned int		generation;	/* Current generation no. */
-	ns_listenlist_t *	listenon;
+	ns_listenlist_t *	listenon4;
+	ns_listenlist_t *	listenon6;
 	dns_aclenv_t		aclenv;		/* Localhost/localnets ACLs */
 	ISC_LIST(ns_interface_t) interfaces;	/* List of interfaces. */
 };
@@ -80,13 +81,17 @@ ns_interfacemgr_create(isc_mem_t *mctx, isc_taskmgr_t *taskmgr,
 	mgr->dispatchmgr = dispatchmgr;
 	mgr->clientmgr = clientmgr;
 	mgr->generation = 1;
-	mgr->listenon = NULL;
+	mgr->listenon4 = NULL;
+	mgr->listenon6 = NULL;	
 	ISC_LIST_INIT(mgr->interfaces);
 
-	result = ns_listenlist_default(mctx, ns_g_port,
-				       &mgr->listenon);
+	/*
+	 * The listen-on lists are initially empty.
+	 */
+	result = ns_listenlist_create(mctx, &mgr->listenon4);
 	if (result != ISC_R_SUCCESS)
 		goto cleanup_mem;
+	ns_listenlist_attach(mgr->listenon4, &mgr->listenon6);
 
 	result = dns_aclenv_init(mctx, &mgr->aclenv);
 	if (result != ISC_R_SUCCESS)
@@ -98,7 +103,8 @@ ns_interfacemgr_create(isc_mem_t *mctx, isc_taskmgr_t *taskmgr,
 	return (ISC_R_SUCCESS);
 
  cleanup_listenon:
-	ns_listenlist_detach(&mgr->listenon);
+	ns_listenlist_detach(&mgr->listenon4);
+	ns_listenlist_detach(&mgr->listenon6);
  cleanup_mem:
 	isc_mem_put(mctx, mgr, sizeof(*mgr));
 	return (result);
@@ -108,7 +114,8 @@ static void
 ns_interfacemgr_destroy(ns_interfacemgr_t *mgr) {
 	REQUIRE(NS_INTERFACEMGR_VALID(mgr));
 	dns_aclenv_destroy(&mgr->aclenv);
-	ns_listenlist_detach(&mgr->listenon);
+	ns_listenlist_detach(&mgr->listenon4);
+	ns_listenlist_detach(&mgr->listenon6);
 	isc_mutex_destroy(&mgr->lock);
 	mgr->magic = 0;
 	isc_mem_put(mgr->mctx, mgr, sizeof *mgr);
@@ -505,7 +512,7 @@ do_ipv4(ns_interfacemgr_t *mgr) {
 		if (result != ISC_R_SUCCESS)
 			goto ignore_interface;
 		
-		for (le = ISC_LIST_HEAD(mgr->listenon->elts);
+		for (le = ISC_LIST_HEAD(mgr->listenon4->elts);
 		     le != NULL;
 		     le = ISC_LIST_NEXT(le, link))
 		{
@@ -577,23 +584,69 @@ do_ipv4(ns_interfacemgr_t *mgr) {
 	isc_interfaceiter_destroy(&iter);
 }
 
+static isc_boolean_t
+listenon_is_ip6_none(ns_listenlist_t *p) {
+	ns_listenelt_t *elt;
+	if (ISC_LIST_EMPTY(p->elts))
+		return (ISC_TRUE); /* No listen-on-v6 statements */
+	elt = ISC_LIST_HEAD(p->elts);
+	if (ISC_LIST_NEXT(elt, link) != NULL)
+		return (ISC_FALSE); /* More than one listen-on-v6 stmt */
+	if (elt->acl->length == 0)
+		return (ISC_TRUE); /* listen-on-v6 { } */
+	if (elt->acl->length > 1)
+		return (ISC_FALSE);  /* listen-on-v6 { ...; ...; } */
+	if (elt->acl->elements[0].negative == ISC_TRUE &&
+	    elt->acl->elements[0].type == dns_aclelementtype_any)
+		return (ISC_TRUE);  /* listen-on-v6 { none; } */
+	return (ISC_FALSE); /* All others */
+}
+
+static isc_boolean_t
+listenon_is_ip6_any(ns_listenlist_t *p, in_port_t *portp) {
+	ns_listenelt_t *elt;
+	if (ISC_LIST_EMPTY(p->elts))
+		return (ISC_FALSE); /* No listen-on-v6 statements */
+	elt = ISC_LIST_HEAD(p->elts);
+	if (ISC_LIST_NEXT(elt, link) != NULL)
+		return (ISC_FALSE); /* More than one listen-on-v6 stmt */
+	if (elt->acl->length != 1)
+		return (ISC_FALSE); 
+	if (elt->acl->elements[0].negative == ISC_FALSE &&
+	    elt->acl->elements[0].type == dns_aclelementtype_any) {
+		*portp = elt->port;
+		return (ISC_TRUE);  /* listen-on-v6 { any; } */
+	}
+	return (ISC_FALSE); /* All others */
+}
+
 static void
 do_ipv6(ns_interfacemgr_t *mgr) {
 	isc_result_t result;
 	ns_interface_t *ifp;
 	isc_sockaddr_t listen_addr;
 	struct in6_addr in6a;
+	in_port_t port;
 
+	if (listenon_is_ip6_none(mgr->listenon6))
+		return;
+	
+	if (! listenon_is_ip6_any(mgr->listenon6, &port)) {
+		isc_log_write(IFMGR_COMMON_LOGARGS,
+		      ISC_LOG_ERROR,			
+		      "bad IPv6 listen-on list: must be 'any' or 'none'");
+		return;
+	}
+		
 	in6a = in6addr_any;
-	isc_sockaddr_fromin6(&listen_addr, &in6a, ns_g_port);
+	isc_sockaddr_fromin6(&listen_addr, &in6a, port);
 
 	ifp = find_matching_interface(mgr, &listen_addr);
 	if (ifp != NULL) {
 		ifp->generation = mgr->generation;
 	} else {
 		isc_log_write(IFMGR_COMMON_LOGARGS, ISC_LOG_INFO,
-			      "listening on IPv6 interfaces, port %u",
-			      ns_g_port);
+			      "listening on IPv6 interfaces, port %u", port);
 		result = ns_interface_setup(mgr, &listen_addr, "<any>", &ifp);
 		if (result != ISC_R_SUCCESS) {
 			isc_log_write(IFMGR_COMMON_LOGARGS,
@@ -640,10 +693,18 @@ ns_interfacemgr_scan(ns_interfacemgr_t *mgr) {
 }
 
 void
-ns_interfacemgr_setlistenon(ns_interfacemgr_t *mgr, ns_listenlist_t *value) {
+ns_interfacemgr_setlistenon4(ns_interfacemgr_t *mgr, ns_listenlist_t *value) {
 	LOCK(&mgr->lock);
-	ns_listenlist_detach(&mgr->listenon);
-	ns_listenlist_attach(value, &mgr->listenon);
+	ns_listenlist_detach(&mgr->listenon4);
+	ns_listenlist_attach(value, &mgr->listenon4);
+	UNLOCK(&mgr->lock);
+}
+
+void
+ns_interfacemgr_setlistenon6(ns_interfacemgr_t *mgr, ns_listenlist_t *value) {
+	LOCK(&mgr->lock);
+	ns_listenlist_detach(&mgr->listenon6);
+	ns_listenlist_attach(value, &mgr->listenon6);
 	UNLOCK(&mgr->lock);
 }
 
diff --git a/bin/named/server.c b/bin/named/server.c
index 1fb39e2070..20fb0ecf86 100644
--- a/bin/named/server.c
+++ b/bin/named/server.c
@@ -400,6 +400,7 @@ configure_view(dns_view_t *view, dns_c_ctx_t *cctx, dns_c_view_t *cview,
 	isc_mem_t *cmctx;
 	dns_dispatch_t *dispatch4 = NULL;
 	dns_dispatch_t *dispatch6 = NULL;
+	in_port_t port;
 	
 	REQUIRE(DNS_VIEW_VALID(view));
 
@@ -407,7 +408,15 @@ configure_view(dns_view_t *view, dns_c_ctx_t *cctx, dns_c_view_t *cview,
 	cmctx = NULL;
 
 	RWLOCK(&view->conflock, isc_rwlocktype_write);
-	
+
+	/*
+	 * Set the view's port number for outgoing queries.
+	 */
+	result = dns_c_ctx_getport(cctx, &port);
+	if (result != ISC_R_SUCCESS)
+		port = 53;
+	dns_view_setdstport(view, port);
+			    
 	/*
 	 * Configure the view's cache.  Try to reuse an existing
 	 * cache if possible, otherwise create a new cache.
@@ -1102,6 +1111,7 @@ load_configuration(const char *filename, ns_server_t *server,
 	dns_dispatch_t *dispatchv6 = NULL;
 	char *pidfilename;
 	isc_uint32_t interface_interval;
+	in_port_t listen_port;
 	
 	dns_aclconfctx_init(&aclconfctx);
 
@@ -1154,6 +1164,16 @@ load_configuration(const char *filename, ns_server_t *server,
 		dns_zonemgr_settransfersperns(server->zonemgr, transfersperns);
 	}
 
+	/*
+	 * Determine which port to use for listening for incoming connections.
+	 */
+	if (ns_g_port != 0) {
+		listen_port = ns_g_port;
+	} else {
+		result = dns_c_ctx_getport(cctx, &listen_port);
+		if (result != ISC_R_SUCCESS)
+			listen_port = 53;
+	}
 	/*
 	 * Configure the interface manager according to the "listen-on"
 	 * statement.
@@ -1171,12 +1191,21 @@ load_configuration(const char *filename, ns_server_t *server,
 							  &listenon);
 		} else {
 			/* Not specified, use default. */
-			CHECK(ns_listenlist_default(ns_g_mctx, ns_g_port,
+			CHECK(ns_listenlist_default(ns_g_mctx, listen_port,
 						    &listenon));
 		}
-		ns_interfacemgr_setlistenon(server->interfacemgr, listenon);
+		ns_interfacemgr_setlistenon4(server->interfacemgr, listenon);
 		ns_listenlist_detach(&listenon);
 	}
+	/*
+	 * Ditto for IPv6.
+	 */
+	{
+		ns_listenlist_t *listenon = NULL;		
+		CHECK(ns_listenlist_default(ns_g_mctx, listen_port, &listenon));
+		ns_interfacemgr_setlistenon6(server->interfacemgr, listenon);
+		ns_listenlist_detach(&listenon);		
+	}
 
 	/*
 	 * Rescan the interface list to pick up changes in the
diff --git a/lib/dns/include/dns/view.h b/lib/dns/include/dns/view.h
index 219b724cfe..16c51f0f0c 100644
--- a/lib/dns/include/dns/view.h
+++ b/lib/dns/include/dns/view.h
@@ -303,7 +303,26 @@ dns_view_setkeyring(dns_view_t *view, dns_tsig_keyring_t *ring);
  *      The static TSIG keyring of 'view' is 'ring'.
  */
 
-
+void
+dns_view_setdstport(dns_view_t *view, in_port_t dstport);
+/*
+ * Set the view's destination port.  This is the port to
+ * which outgoing queries are sent.  The default is 53,
+ * the standard DNS port.
+ *
+ * Requires:
+ *
+ *      'view' is a valid view.
+ *
+ *      'dstport' is a valid TCP/UDP port number.
+ *
+ * Ensures:
+ *	External name servers will be assumed to be listning
+ *	on 'dstport'.  For servers whose address has already
+ *	obtained obtained at the time of the call, the view may
+ *	continue to use the previously set port until the address
+ *	times out from the view's address database.
+ */
 
 
 isc_result_t
diff --git a/lib/dns/view.c b/lib/dns/view.c
index 61b3085841..e7b8d66a01 100644
--- a/lib/dns/view.c
+++ b/lib/dns/view.c
@@ -515,6 +515,12 @@ dns_view_setkeyring(dns_view_t *view, dns_tsig_keyring_t *ring) {
 	view->statickeys = ring;
 }
 
+void
+dns_view_setdstport(dns_view_t *view, in_port_t dstport) {
+	REQUIRE(DNS_VIEW_VALID(view));
+	view->dstport = dstport;
+}
+
 isc_result_t
 dns_view_addzone(dns_view_t *view, dns_zone_t *zone) {
 	isc_result_t result;