N1盒子与RT-AC68U组合路由尝试。

AC68U，切换为AP模式，并固定IP，然后SSH进入，设置：

robocfg vlans reset vlan 1 ports "0t 2 3 4 5t" vlan 2 ports "0t 1" vlan 3 ports "5t"

开机启动文件

echo \#!/bin/sh>/jffs/scripts/services-start
echo robocfg vlans reset vlan 1 ports "0t 2 3 4 5t" vlan 2 ports "0t 1" vlan 3 ports "5t" >> /jffs/scripts/services-start
chmod a+rx /jffs/scripts/services-start

以上解释为：

vlan1 0t 2 3 4 5t
vlan2 0t 1
vlan3 5t

AC68U的默认模式是：

1: vlan1: 1 2 3 4 8t
2: vlan2: 0 8t

然后进入N1。设置好LAN为vlan eth0.1并关闭桥接，WAN口设置PPPOE拨号，并设置eth0.2。
添加防火墙代码：

iptables -t nat -I POSTROUTING -o pppoe-WAN -j MASQUERADE