首先假設我們目前的網路配置如下： /etc/network/interfaces
# This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5). # The loopback network interface auto lo iface lo inet loopback # The primary network interface allow-hotplug eth0 iface eth0 inet static address 192.168.0.10 netmask 255.255.255.0 gateway 192.168.0.1 # The secondary network interface allow-hotplug eth1 iface eth1 inet static address 10.10.0.10 netmask 255.255.255.0
修改 /etc/iproute2/rt_tables
# # reserved values # 255 local 254 main 253 default 0 unspec # # local # #1 inr.ruhep 1 rt2 #此為新增的 route table 2
手動加入路由表：
ip route add 10.10.0.0/24 dev eth1 src 10.10.0.10 table rt2 ip route add default via 10.10.0.1 dev eth1 table rt2
加入路由規則：
ip rule add from 10.10.0.10/32 table rt2 ip rule add to 10.10.0.10/32 table rt2
修改 /etc/network/interfaces 中的 eth1 設定(開機可自動設定)
[...] iface eth1 inet static address 10.10.0.10 netmask 255.255.255.0 post-up ip route add 10.10.0.0/24 dev eth1 src 10.10.0.10 table rt2 post-up ip route add default via 10.10.0.1 dev eth1 table rt2 post-up ip rule add from 10.10.0.10/32 table rt2 post-up ip rule add to 10.10.0.10/32 table rt2 [...]
查看設定結果
ip route list table rt2 ip rule show
參考來源：
https://www.thomas-krenn.com/en/wiki/Two_Default_Gateways_on_One_System