OpenWrt PPPoE 網路載入最佳化說明書

🔍 問題描述

使用 OpenWrt 進行中華電信 PPPoE 撥號時，常因 MTU 限制導致網頁圖片載入緩慢或轉圈圈。

🛠️ CLI 修正步驟

1. 寫入 MSS 修正腳本

echo "nft add rule inet fw4 forward tcp flags syn tcp option maxseg size set rt mtu" >> /etc/firewall.user

2.配置防火牆載入自定義規則

uci add firewall include
uci set firewall.@include[-1].path='/etc/firewall.user'
uci set firewall.@include[-1].fw4_compatible='1'
uci commit firewall
/etc/init.d/firewall restart

3.恢復 WAN 介面自動 MTU

uci del network.wan.mtu
uci commit network
ifdown wan && ifup wan

✅ 驗證指令

nft list table inet fw4 | grep "tcp flags syn"

應出現：tcp flags syn tcp option maxseg size set rt mtu