diff --git a/bgpwtf/machines/modules/router.nix b/bgpwtf/machines/modules/router.nix
index 4999401e..53d49229 100644
--- a/bgpwtf/machines/modules/router.nix
+++ b/bgpwtf/machines/modules/router.nix
@@ -35,6 +35,7 @@ rec {
   boot.kernel.sysctl."net.ipv6.conf.*.accept_ra" = 0;
   boot.kernel.sysctl."net.ipv6.conf.*.autoconf" = 0;
   boot.kernel.sysctl."net.ipv6.conf.*.router_solicitations" = 0;
+  boot.kernel.sysctl."net.ipv6.route.max_size" = 2147483647;
 
   # Use Chrony instead of systemd-timesyncd
   time.timeZone = "Europe/Warsaw";