diff -Nru unbound-1.4.22/debian/changelog unbound-1.4.22/debian/changelog
--- unbound-1.4.22/debian/changelog	2015-01-08 16:38:25.000000000 +0100
+++ unbound-1.4.22/debian/changelog	2015-07-16 12:48:24.000000000 +0200
@@ -1,3 +1,13 @@
+unbound (1.4.22-1ubuntu4.14.04.2) trusty; urgency=medium
+
+  * Make some lookups on a dual stacked (IPv4 and IPv6) host work.
+    - debian/patches/increase-max_sent_count: Increase MAX_SENT_COUNT to 32,
+      backported from Unbound 1.5.0 (LP: #1472510).
+    - Can be verified with:
+      # unbound-host -f /var/lib/unbound/root.key a.root-servers.net
+
+ -- Patrik Lundin <patrik.lundin@su.se>  Thu, 16 Jul 2015 12:45:58 +0200
+
 unbound (1.4.22-1ubuntu4.14.04.1) trusty-security; urgency=medium
 
   * SECURITY UPDATE: denial of service via large number of referrals
diff -Nru unbound-1.4.22/debian/patches/increase-max_sent_count unbound-1.4.22/debian/patches/increase-max_sent_count
--- unbound-1.4.22/debian/patches/increase-max_sent_count	1970-01-01 01:00:00.000000000 +0100
+++ unbound-1.4.22/debian/patches/increase-max_sent_count	2015-07-16 12:48:52.000000000 +0200
@@ -0,0 +1,17 @@
+Description: Change MAX_SENT_COUNT from 16 to 32 to resolve some cases easier.
+Origin: upstream, http://unbound.nlnetlabs.nl/svn/ revision 3127
+Bug-Ubuntu: https://bugs.launchpad.net/ubuntu/+source/unbound/+bug/1472510
+
+Index: unbound-1.4.22/iterator/iterator.h
+===================================================================
+--- unbound-1.4.22.orig/iterator/iterator.h	2015-07-16 12:42:41.000000000 +0200
++++ unbound-1.4.22/iterator/iterator.h	2015-07-16 12:44:34.880857528 +0200
+@@ -59,7 +59,7 @@
+ /** max number of referrals. Makes sure resolver does not run away */
+ #define MAX_REFERRAL_COUNT	130
+ /** max number of queries-sent-out.  Make sure large NS set does not loop */
+-#define MAX_SENT_COUNT		16
++#define MAX_SENT_COUNT		32
+ /** at what query-sent-count to stop target fetch policy */
+ #define TARGET_FETCH_STOP	3
+ /** how nice is a server without further information, in msec 
diff -Nru unbound-1.4.22/debian/patches/series unbound-1.4.22/debian/patches/series
--- unbound-1.4.22/debian/patches/series	2015-01-08 16:37:50.000000000 +0100
+++ unbound-1.4.22/debian/patches/series	2015-07-16 12:44:04.000000000 +0200
@@ -3,3 +3,4 @@
 silence_open_files_limit_warning
 disable_remote_control_in_tests
 CVE-2014-8602.patch
+increase-max_sent_count