diff --git a/dns/named.conf.j2 b/dns/named.conf.j2
index 8e1fa46..453848b 100644
--- a/dns/named.conf.j2
+++ b/dns/named.conf.j2
@@ -27,6 +27,7 @@ options {
         "d.f.ip6.arpa";
     };
     empty-zones-enable no;
+    ixfr-from-differences yes;
 {% if inventory_hostname == 'us1.routers.9pfs.dn42' %}
     notify-source-v6 fd32:6b0:70a6:53::ffff;
 {% else %}
diff --git a/dns/us1-named.conf.j2 b/dns/us1-named.conf.j2
index 36dd383..3b201c0 100644
--- a/dns/us1-named.conf.j2
+++ b/dns/us1-named.conf.j2
@@ -18,6 +18,14 @@ zone "9pfs.dn42" IN {
     inline-signing yes;
 };
 
+zone "as4242422002.dn42" IN {
+    type primary;
+    file "as4242422002.dn42.zone";
+{% include 'notify-list.j2' %}
+    dnssec-policy default;
+    inline-signing yes;
+};
+
 zone "myip.dn42" IN {
     type secondary;
     file "myip.dn42.zone";