diff --git a/nix/lib/config/legacy.nix b/nix/lib/config/legacy.nix
index d8fa7b7..ef18cfb 100644
--- a/nix/lib/config/legacy.nix
+++ b/nix/lib/config/legacy.nix
@@ -49,6 +49,7 @@ in
       core.ospf.secret = pillar.ospf.secret;
       pub.dynamicDomain = true;
 
+      c3d2.dynamicDomain = true;
       c3d2.dhcp = {
         server = "c3d2-gw3";
         router = "c3d2-anon";
diff --git a/nix/lib/dns.nix b/nix/lib/dns.nix
index 7e9a38c..1e8f4b4 100644
--- a/nix/lib/dns.nix
+++ b/nix/lib/dns.nix
@@ -17,6 +17,7 @@ rec {
     "77.20.172.in-addr.arpa"
     "78.20.172.in-addr.arpa"
     "79.20.172.in-addr.arpa"
+    "99.22.172.in-addr.arpa"
   ];
 
   localZones =