From b1e55c335458f42b01ddfbb13adbe5cdae509ce4 Mon Sep 17 00:00:00 2001
From: starry <115192496+sky22333@users.noreply.github.com>
Date: Fri, 19 Dec 2025 19:51:22 +0800
Subject: [PATCH] Update README.md

---
 l2tp/README.md | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/l2tp/README.md b/l2tp/README.md
index 7d8a66e..38bacbf 100644
--- a/l2tp/README.md
+++ b/l2tp/README.md
@@ -74,6 +74,12 @@ iptables -t mangle -A SINGBOX -s 10.10.10.0/24 -p udp -j TPROXY --on-port 12345
 iptables -t mangle -A PREROUTING -j SINGBOX
 ```
 
+6：不允许公网访问透明代理端口
+```
+iptables -I INPUT -p tcp --dport 12345 -j DROP
+iptables -I INPUT -p udp --dport 12345 -j DROP
+```
+
 #### 清理流量规则（按顺序执行）
 ```
 # 清理 iptables 规则
@@ -86,3 +92,8 @@ iptables -t mangle -X SINGBOX
 /bin/ip route del local 0.0.0.0/0 dev lo table 100
 /bin/ip rule del fwmark 1 table 100
 ```
+```
+# 放行透明代理端口
+iptables -D INPUT -p tcp --dport 12345 -j DROP
+iptables -D INPUT -p udp --dport 12345 -j DROP
+```