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7z
route - Linux命令大全 - 笔下光年
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route
显示并设置Linux中静态路由表 ## 补充说明 **route命令** 用来显示并设置Linux内核中的网络路由表,route命令设置的路由主要是静态路由。要实现两个不同的子网之间的通信,需要一台连接两个网络的路由器,或者同时位于两个网络的网关来实现。 在Linux系统中设置路由通常是为了解决以下问题:该Linux系统在一个局域网中,局域网中有一个网关,能够让机器访问Internet,那么就需要将这台机器的ip地址设置为Linux机器的默认路由。要注意的是,直接在命令行下执行route命令来添加路由,不会永久保存,当网卡重启或者机器重启之后,该路由就失效了;可以在`/etc/rc.local`中添加route命令来保证该路由设置永久有效。 ### 语法 ```shell route(选项)(参数) ``` ### 选项 ```shell -A:设置地址类型; -C:打印将Linux核心的路由缓存; -v:详细信息模式; -n:不执行DNS反向查找,直接显示数字形式的IP地址; -e:netstat格式显示路由表; -net:到一个网络的路由表; -host:到一个主机的路由表。 ``` ### 参数 ```shell add:增加指定的路由记录; del:删除指定的路由记录; target:目的网络或目的主机; gw:设置默认网关; mss:设置TCP的最大区块长度(MSS),单位MB; window:指定通过路由表的TCP连接的TCP窗口大小; dev:路由记录所表示的网络接口。 ``` ### 实例 **显示当前路由:** ```shell [root@localhost ~]# route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 112.124.12.0 * 255.255.252.0 U 0 0 0 eth1 10.160.0.0 * 255.255.240.0 U 0 0 0 eth0 192.168.0.0 10.160.15.247 255.255.0.0 UG 0 0 0 eth0 172.16.0.0 10.160.15.247 255.240.0.0 UG 0 0 0 eth0 10.0.0.0 10.160.15.247 255.0.0.0 UG 0 0 0 eth0 default 112.124.15.247 0.0.0.0 UG 0 0 0 eth1 [root@localhost ~]# route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 112.124.12.0 0.0.0.0 255.255.252.0 U 0 0 0 eth1 10.160.0.0 0.0.0.0 255.255.240.0 U 0 0 0 eth0 192.168.0.0 10.160.15.247 255.255.0.0 UG 0 0 0 eth0 172.16.0.0 10.160.15.247 255.240.0.0 UG 0 0 0 eth0 10.0.0.0 10.160.15.247 255.0.0.0 UG 0 0 0 eth0 0.0.0.0 112.124.15.247 0.0.0.0 UG 0 0 0 eth1 ``` 其中Flags为路由标志,标记当前网络节点的状态,Flags标志说明: * U Up表示此路由当前为启动状态。 * H Host,表示此网关为一主机。 * G Gateway,表示此网关为一路由器。 * R Reinstate Route,使用动态路由重新初始化的路由。 * D Dynamically,此路由是动态性地写入。 * M Modified,此路由是由路由守护程序或导向器动态修改。 * ! 表示此路由当前为关闭状态。 **添加网关/设置网关:** ```shell route add -net 224.0.0.0 netmask 240.0.0.0 dev eth0 #增加一条到达224.0.0.0的路由。 ``` **屏蔽一条路由:** ```shell route add -net 224.0.0.0 netmask 240.0.0.0 reject #增加一条屏蔽的路由,目的地址为224.x.x.x将被拒绝。 ``` **删除路由记录:** ```shell route del -net 224.0.0.0 netmask 240.0.0.0 route del -net 224.0.0.0 netmask 240.0.0.0 reject ``` **删除和添加设置默认网关:** ```shell route del default gw 192.168.120.240 route add default gw 192.168.120.240 ```
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