diff --git a/internal/emitter/nft.go b/internal/emitter/nft.go
index 4eebe1b..872e876 100644
--- a/internal/emitter/nft.go
+++ b/internal/emitter/nft.go
@@ -107,6 +107,8 @@ func renderNftRuleset(cfg NftClusterConfig) string {
 	b.WriteString("\t}\n\n")
 	b.WriteString("\tchain input {\n")
 	b.WriteString("\t\ttype filter hook input priority filter; policy accept;\n")
+	b.WriteString("\t\tct state invalid drop\n")
+	b.WriteString("\t\tct state established,related accept\n")
 	b.WriteString("\t\ttcp dport 443 tcp-flags != syn,rst,ack,fin notrack drop\n")
 	b.WriteString("\t}\n\n")
 	b.WriteString("\tchain prerouting {\n")