From 0fba1036e9fd13512af2456169a3366ddb55019f Mon Sep 17 00:00:00 2001
From: Fuwn <contact@fuwn.me>
Date: Sun, 22 Sep 2024 13:53:04 -0700
Subject: tailscale: optimise subnet routers and exit nodes

---
 modules/core/networking/vpn/tailscale.nix | 31 +++++++++++++++++++++++++------
 1 file changed, 25 insertions(+), 6 deletions(-)

(limited to 'modules/core/networking/vpn')

diff --git a/modules/core/networking/vpn/tailscale.nix b/modules/core/networking/vpn/tailscale.nix
index 21f471a..06c5b50 100644
--- a/modules/core/networking/vpn/tailscale.nix
+++ b/modules/core/networking/vpn/tailscale.nix
@@ -1,15 +1,34 @@
-{ config, ... }:
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
 {
   networking.firewall.trustedInterfaces = [ "${config.services.tailscale.interfaceName}" ];
 
-  services.tailscale = {
-    enable = true;
-    useRoutingFeatures = "both";
-  };
-
   # <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";
+    };
+
+    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
+        '';
+      };
+    };
+  };
 }
-- 
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