diff --git a/nixbld-etc-nixos/configuration.nix b/nixbld-etc-nixos/configuration.nix
index d662012..b4b357f 100644
--- a/nixbld-etc-nixos/configuration.nix
+++ b/nixbld-etc-nixos/configuration.nix
@@ -253,22 +253,12 @@ in
         listenPort = 51820;
         privateKeyFile = "/path/to/private/key"; # just `wg-quick genkey > /path/to/private/key`
         postUp = ''
-          ${pkgs.iproute2}/bin/ip rule add from all fwmark 1 lookup 51820
+          ${pkgs.iproute2}/bin/ip rule add from 10.42.0.0/30 lookup 51820
           ${pkgs.iproute2}/bin/ip route add default via 10.42.0.1 dev intl0 table 51820
-          ${pkgs.iptables}/bin/iptables -t mangle -A PREROUTING -i intl0 -p tcp -j MARK --set-mark 1
-          ${pkgs.iptables}/bin/iptables -A OUTPUT -o intl0 -m connmark --mark 1 -j ACCEPT
-          ${pkgs.iptables}/bin/iptables -A INPUT -i intl0 -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
-          ${pkgs.iptables}/bin/iptables -t mangle -A PREROUTING -m conntrack --ctstate NEW -i intl0 -p tcp -j CONNMARK --save-mark
-          ${pkgs.iptables}/bin/iptables -t mangle -A OUTPUT -m conntrack --ctstate ESTABLISHED,RELATED -j CONNMARK --restore-mark
         '';
         preDown = ''
-          ${pkgs.iproute2}/bin/ip rule del from all fwmark 1 lookup 51820
+          ${pkgs.iproute2}/bin/ip rule del from 10.42.0.0/30 lookup 51820
           ${pkgs.iproute2}/bin/ip route del default via 10.42.0.1 dev intl0 table 51820
-          ${pkgs.iptables}/bin/iptables -t mangle -D PREROUTING -i intl0 -p tcp -j MARK --set-mark 1
-          ${pkgs.iptables}/bin/iptables -D OUTPUT -o intl0 -m connmark --mark 1 -j ACCEPT
-          ${pkgs.iptables}/bin/iptables -D INPUT -i intl0 -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
-          ${pkgs.iptables}/bin/iptables -t mangle -D PREROUTING -m conntrack --ctstate NEW -i intl0 -p tcp -j CONNMARK --save-mark
-          ${pkgs.iptables}/bin/iptables -t mangle -D OUTPUT -m conntrack --ctstate ESTABLISHED,RELATED -j CONNMARK --restore-mark
         '';
         peers = [
           {