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k2p主路由地址：192.168.1.1
n1盒子地址：192.168.1.2
k2p添加低优先级默认路由走n1，此路由只有pppoe断开后才有效：

ip rou add default via 192.168.1.2 dev br-lan metric 1000

n1盒子用netplan配置无线网络默认路由和无线热点的路由优先级，默认情况下走k2p主路由，当路由器pppoe不能连接时打开手机无线热点则自动走手机4g网络连接。

network:
    version: 2
    renderer: networkd
    ethernets:
        eth0:
            addresses:
            - 192.168.1.2/24
            dhcp4: false
            dhcp6: true
            accept-ra: true
            #gateway4: 192.168.1.1
            routes:
                - to: 0.0.0.0/0
                  via: 192.168.1.1
                  metric: 1000
            nameservers:
                addresses:
                - 192.168.1.1
                search: []

    wifis:
      wlan0:
        #防止开机时wlan0未连接导致systemd-networkd-wait-online阻塞系统启动
        optional: true
        dhcp4: yes
        dhcp6: no
        dhcp4-overrides:
            route-metric: 600
        access-points:
            "Phone-ssid":
                password: "www.haiyun.me"

n1盒子开启snat及网络转发：

iptables -t nat -A POSTROUTING -o wlan0 -j MASQUERADE
sysctl -w net.ipv4.ip_forward=1

标签：k2p, n1, 宽带手机热点多线路切换