From c6ab810e37c96abea58067f9102c88429e179f2b Mon Sep 17 00:00:00 2001
From: "William A. Kennington III" <william@wkennington.com>
Date: Sun, 29 Dec 2013 20:58:59 -0600
Subject: [PATCH] network-interfaces: Add mtu setting support

Adds a setting to the network interface configuration for changing the
mtu for each specified interface.
---
 nixos/modules/tasks/network-interfaces.nix | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/nixos/modules/tasks/network-interfaces.nix b/nixos/modules/tasks/network-interfaces.nix
index b1ab989f130f..6b886468a4b8 100644
--- a/nixos/modules/tasks/network-interfaces.nix
+++ b/nixos/modules/tasks/network-interfaces.nix
@@ -58,6 +58,15 @@ let
         '';
       };
 
+      mtu = mkOption {
+        default = null;
+        example = 9000;
+        type = types.nullOr types.int;
+        description = ''
+          MTU size for packets leaving the interface. Leave empty to use the default.
+        '';
+      };
+
       virtual = mkOption {
         default = false;
         type = types.bool;
@@ -342,6 +351,11 @@ in
                   echo "setting MAC address to ${i.macAddress}..."
                   ip link set "${i.name}" address "${i.macAddress}"
                 ''
+              + optionalString (i.mtu != null)
+                ''
+                  echo "setting MTU to ${toString i.mtu}..."
+                  ip link set "${i.name}" mtu "${toString i.mtu}"
+                ''
               + optionalString (i.ipAddress != null)
                 ''
                   cur=$(ip -4 -o a show dev "${i.name}" | awk '{print $4}')