diff --git a/nix/nixos-module/defaults.nix b/nix/nixos-module/defaults.nix
index 84a0fdd..f286093 100644
--- a/nix/nixos-module/defaults.nix
+++ b/nix/nixos-module/defaults.nix
@@ -25,7 +25,7 @@
 
   environment.systemPackages = with pkgs; [
     vim screen git wget psmisc
-    tcpdump iputils mtr traceroute bmon
+    tcpdump iputils mtr traceroute bmon iptables conntrack-tools
     bridge-utils dhcpcd ethtool
   ];