diff --git a/nix/modules/sysctl.nix b/nix/modules/sysctl.nix
index 723a6ef..498f1d4 100644
--- a/nix/modules/sysctl.nix
+++ b/nix/modules/sysctl.nix
@@ -4,6 +4,7 @@
     "vm.swappiness" = 2;
     #"vm.vfs_cache_pressure" = 80;
     "net.ipv4.ip_forward" = 1;
+    "net.ipv6.conf.all.forwarding" = 1;
     #"net.ipv4.tcp_window_scaling" = 0;
     # as per https://wiki.archlinux.org/index.php/Sysctl#Improving_performance
     "net.core.rmem_default" = 1048576;