From 05c7d124f30eea931ccd2d147449c2ae9206c623 Mon Sep 17 00:00:00 2001
From: Steven Allen <steven@stebalien.com>
Date: Wed, 14 Jan 2026 13:12:50 -0800
Subject: [PATCH] nixos/systemd-networkd: Add missing UseRetransmissionTime
 option

---
 nixos/modules/system/boot/networkd.nix | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/nixos/modules/system/boot/networkd.nix b/nixos/modules/system/boot/networkd.nix
index 2bf1ac8d0531..fd1fa65ef945 100644
--- a/nixos/modules/system/boot/networkd.nix
+++ b/nixos/modules/system/boot/networkd.nix
@@ -1232,6 +1232,7 @@ let
           "UseRedirect"
           "UseHopLimit"
           "UseReachableTime"
+          "UseRetransmissionTime"
         ])
         (assertValueOneOf "UseDNS" boolValues)
         (assertValueOneOf "UseDNR" boolValues)
@@ -1248,6 +1249,7 @@ let
         (assertValueOneOf "UseRedirect" boolValues)
         (assertValueOneOf "UseHopLimit" boolValues)
         (assertValueOneOf "UseReachableTime" boolValues)
+        (assertValueOneOf "UseRetransmissionTime" boolValues)
       ];
 
       sectionDHCPServer = checkUnitConfig "DHCPServer" [