显示网卡信息: ip addr show eth0
    添加 ip 地址: ip addr add 192.168.1.2/24 dev eth0

    显示路由信息: ip route
    添加默认路由: ip route add default via 192.168.1.1
    添加路由: ip route add 192.168.171.0/25 via 192.168.170.5
    删除路由: ip route del 192.168.171.0/25 via 192.168.170.5
    清空路由: ip route flush table main
    清空 arp 缓存: ip -s -s neigh flush all

    开启路由器转发功能: echo 1 > /proc/sys/net/ipv4/ip_forward

    清空路由后，再添加路由提示错误: Error: Nexthop has invalid gateway.
    添加默认路由: ip route add default via 192.168.1.1 dev eth0 onlink

    参考: