diff --git a/config/net/roof.nix b/config/net/roof.nix
index 47c0009..068f65c 100644
--- a/config/net/roof.nix
+++ b/config/net/roof.nix
@@ -4,6 +4,11 @@
     vlan = null;
     # leave space for vxlan
     mtu = 1574;
+    subnet4 = "10.0.57.0/24";
+    hosts4 = {
+      ap57 = "10.0.57.1";
+      ap58 = "10.0.57.2";
+    };
     hosts6.dn42 = {
       ap57 = "fd23:42:c3d2:584::39";
       ap58 = "fd23:42:c3d2:584::40";