diff --git a/networking.nix b/networking.nix
index a6f8360..5763240 100644
--- a/networking.nix
+++ b/networking.nix
@@ -19,7 +19,7 @@
 
   boot.kernel.sysctl = {
     "net.ipv6.conf.all.temp_prefered_lft" = 1800; # 30 min
-    "net.ipv6.conf.all.temp_valid_lft" = 3600; # 1 heure
+    "net.ipv6.conf.all.temp_valid_lft" = 43200; # 12 heures
     "net.ipv6.conf.all.use_tempaddr" = 2; # activé
 
     "net.ipv6.conf.default.temp_prefered_lft" = 3600; # 1 heure