2 files changed, 57 insertions, 0 deletions
diff --git a/modules/core/networking/default.nix b/modules/core/networking/default.nix
new file mode 100644
index 0000000..5e53759
--- /dev/null
+++ b/modules/core/networking/default.nix
@@ -0,0 +1,22 @@
+{ secrets, ... }:
+{
+  imports = [ ./tailscale.nix ];
+
+  networking = {
+    nftables.enable = true;
+
+    nameservers = [
+      "45.90.28.0#${secrets.nextdns_id}.dns.nextdns.io"
+      "2a07:a8c0::#${secrets.nextdns_id}.dns.nextdns.io"
+      "45.90.30.0#${secrets.nextdns_id}.dns.nextdns.io"
+      "2a07:a8c1::#${secrets.nextdns_id}.dns.nextdns.io"
+    ];
+
+    timeServers = [
+      "0.nixos.pool.ntp.org"
+      "1.nixos.pool.ntp.org"
+      "2.nixos.pool.ntp.org"
+      "3.nixos.pool.ntp.org"
+    ];
+  };
+}
diff --git a/modules/core/networking/tailscale.nix b/modules/core/networking/tailscale.nix
new file mode 100644
index 0000000..0228915
--- /dev/null
+++ b/modules/core/networking/tailscale.nix
@@ -0,0 +1,35 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+{
+  networking.firewall.trustedInterfaces = [ "${config.services.tailscale.interfaceName}" ];
+
+  # <https://tailscale.com/kb/1019/subnets/?tab=linux#step-1-install-the-tailscale-client>
+  boot.kernel.sysctl = {
+    "net.ipv4.ip_forward" = true;
+    "net.ipv6.conf.all.forwarding" = true;
+  };
+
+  services = {
+    tailscale = {
+      enable = true;
+      useRoutingFeatures = "both";
+      authKeyFile = config.sops.secrets.tailscale_authentication_key.path;
+    };
+
+    networkd-dispatcher = {
+      enable = true;
+
+      rules."50-tailscale" = {
+        onState = [ "routable" ];
+
+        script = ''
+          ${lib.getExe pkgs.ethtool} -K enp42s0 rx-udp-gro-forwarding on rx-gro-list off
+        '';
+      };
+    };
+  };
+}