diff --git a/hosts/FredOS-Gaming.nix b/hosts/FredOS-Gaming.nix
index 251a827..3fdf6ff 100644
--- a/hosts/FredOS-Gaming.nix
+++ b/hosts/FredOS-Gaming.nix
@@ -44,6 +44,18 @@
     # LAN has no IPv6 route — AAAA lookups succeed but connect fails, which
     # made NetworkManager's connectivity probe report "limited" at boot
     # (GNOME's "?" icon) until the next 5-min repoll.
+    #
+    # `enableIPv6 = false` only sets the system-wide sysctl; NetworkManager
+    # still flips disable_ipv6=0 on the live interface because each connection
+    # defaults to `ipv6.method = auto`. The probe then races over a SLAAC ULA
+    # that has no real upstream and we get the "?" again. Force every NM
+    # connection to skip v6 altogether and ignore router advertisements at
+    # the kernel layer for any future interface.
     networking.enableIPv6 = false;
+    networking.networkmanager.connectionConfig."ipv6.method" = "disabled";
+    boot.kernel.sysctl = {
+      "net.ipv6.conf.all.accept_ra" = 0;
+      "net.ipv6.conf.default.accept_ra" = 0;
+    };
   };
 }