linux 添加、删除 route

三种路由类型：

2.网络路由（N）：主机可以到达的网络，Flags字段为N

Flags为路由标志，编辑当前网络节点的状态

·U   up代表路由当前为启动状态
     ·H   host表示此网关为一个主机
     ·G   gateway此网关为一个路由器
     ·R   reinstate route使用动态路由重新初始化的路由
     ·D   dynamically，此路由是动态写入的
     ·M   modified是有路由守护程序或导向器修改
     ·！  此路由当前为关闭状态

# route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         10.0.7.253      0.0.0.0         UG    0      0        0 eth0
default         10.0.6.253      0.0.0.0         UG    1001   0        0 eth1
10.0.6.0        0.0.0.0         255.255.255.0   U     0      0        0 eth1
10.0.7.0        0.0.0.0         255.255.255.0   U     0      0        0 eth0

# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         10.0.7.253      0.0.0.0         UG    0      0        0 eth0
0.0.0.0         10.0.6.253      0.0.0.0         UG    1001   0        0 eth1
10.0.6.0        0.0.0.0         255.255.255.0   U     0      0        0 eth1
10.0.7.0        0.0.0.0         255.255.255.0   U     0      0        0 eth0

route add default gw 10.0.7.253 dev eth0
route add default gw 10.0.6.253 dev eth1
route add -net 10.0.6.0 netmask 255.255.255.0 dev eth1
route add -net 10.0.7.0 netmask 255.255.255.0 dev eth0

添加路由

route -v add

route add -net 192.168.56.0/24 dev eth0
route add -net 192.168.56.0/24 gw 192.168.56.1
route add -net 192.168.56.0 netmask 255.255.255.0 gw 192.168.56.1
route add -net 192.168.56.0 netmask 255.255.255.0 gw 192.168.56.1 dev eth0 metric 1

添加默认路由

route add default gw 192.168.56.1 dev eth0
route add -net 0.0.0.0 gw 192.168.56.1 netmask 0.0.0.0 dev eth0

清空路由表

# ip route | awk '{print $1}' | while read line; do ip route del $line; done

删除路由

route -v del

route del -net 192.168.56.0 netmask 255.255.255.0
route del -net 192.168.56.0 netmask 255.255.255.0 dev eth0
route del -net 192.168.56.0 dev eth0

删除默认路由

route del default 
route del default dev enp0s8
route del default dev enp0s9