diff --git a/post-fs-data.sh b/post-fs-data.sh
index 0fba57f..9b52c9a 100644
--- a/post-fs-data.sh
+++ b/post-fs-data.sh
@@ -10,6 +10,7 @@ MODDIR=${0%/*}
 
 iptables -t nat -A OUTPUT -p tcp ! -d 91.239.100.100 --dport 53 -j DNAT --to-destination 127.0.0.1:5354
 iptables -t nat -A OUTPUT -p udp ! -d 91.239.100.100 --dport 53 -j DNAT --to-destination 127.0.0.1:5354
-ip6tables -A OUTPUT -p tcp --dport 53 -j DROP
-ip6tables -A OUTPUT -p udp --dport 53 -j DROP
+ip6tables -P INPUT DROP
+ip6tables -P FORWARD DROP
+ip6tables -P OUTPUT DROP