diff --git a/nix/deuxfleurs.nix b/nix/deuxfleurs.nix
index 7b9065e..f9fd068 100644
--- a/nix/deuxfleurs.nix
+++ b/nix/deuxfleurs.nix
@@ -204,6 +204,13 @@ in
         # link-local addresses
         networkConfig.IPv6AcceptRA = mkIf noRA false;
         networkConfig.LinkLocalAddressing = mkIf noRA "no";
+
+        # By default, systemd-networkd may try to use DHCPv6 depending on RA flags.
+        # Disable DHCPv6 client and IPv6 Prefix Delegation in all cases.
+        ipv6AcceptRAConfig.DHCPv6Client = false;
+        dhcpV6Config.UseAddress = false;
+        dhcpV6Config.UseDelegatedPrefix = false;
+
       };
 
     # Configure Unbound as a central DNS server for everything