diff --git a/cluster/prod/site/neptune.nix b/cluster/prod/site/neptune.nix
index f2415d5..5434bd5 100644
--- a/cluster/prod/site/neptune.nix
+++ b/cluster/prod/site/neptune.nix
@@ -3,6 +3,7 @@
 {
   deuxfleurs.site_name = "neptune";
   deuxfleurs.lan_default_gateway = "192.168.1.1";
+  deuxfleurs.ipv6_default_gateway = "2a06:a004:3025:1::1";
   deuxfleurs.lan_ip_prefix_length = 24;
   deuxfleurs.ipv6_prefix_length = 64;
   deuxfleurs.nameservers = [ "192.168.1.1" ];
diff --git a/cluster/staging/site/neptune.nix b/cluster/staging/site/neptune.nix
index 3a79315..76373ab 100644
--- a/cluster/staging/site/neptune.nix
+++ b/cluster/staging/site/neptune.nix
@@ -3,6 +3,7 @@
 {
   deuxfleurs.site_name = "neptune";
   deuxfleurs.lan_default_gateway = "192.168.1.1";
+  deuxfleurs.ipv6_default_gateway = "2a06:a004:3025:1::1";
   deuxfleurs.lan_ip_prefix_length = 24;
   deuxfleurs.ipv6_prefix_length = 64;
   deuxfleurs.nameservers = [ "192.168.1.1" ];