1 files changed, 4 insertions, 0 deletions
diff --git a/nixpkgs/nixos/modules/virtualisation/docker.nix b/nixpkgs/nixos/modules/virtualisation/docker.nix
index 3eb0de3a8559..29f133786d8d 100644
--- a/nixpkgs/nixos/modules/virtualisation/docker.nix
+++ b/nixpkgs/nixos/modules/virtualisation/docker.nix
@@ -150,6 +150,10 @@ in
 
   config = mkIf cfg.enable (mkMerge [{
       boot.kernelModules = [ "bridge" "veth" ];
+      boot.kernel.sysctl = {
+        "net.ipv4.conf.all.forwarding" = mkOverride 98 true;
+        "net.ipv4.conf.default.forwarding" = mkOverride 98 true;
+      };
       environment.systemPackages = [ cfg.package ]
         ++ optional cfg.enableNvidia pkgs.nvidia-docker;
       users.groups.docker.gid = config.ids.gids.docker;