Introduction to route usage

Introduction to route usage

Print the current routing table: route -n common parameters:           add: Add a new route.           del: Deletes a route.           -net: The destination address is a network.           -host: The destination address is a host.           netmask: When you add a network route, you need to use a netmask.           GW: Route packets through the gateway. Note that the gateway you specify must be able to be reached.           metric: Sets the route hop count. The # route  command adds a route, the machine restarts, or the network card restarts, and the method of setting the permanent route under Linux: 1. Add 2 in/etc/rc.local. Add to end 3 in/etc/sysconfig/network ./etc/sysconfig/static-router :any net x.x.x.x/24 gw y.y.y.yroute add  default gw 192.168.1.254route del default gw 192.168.1.254route add - net 192.168.100.0 netmask 255.255.255.0 dev eth0route add -host Ip dev lo:1route del -host ip If the IP has been properly configured, but want to adjust the default gateway, how to do it? "Adjust instances of the default gateway" view Route:[[email protected] ~]# route -nkernel ip routing  tabledestination     gateway          genmask         flags metric ref     Use Iface10.0.200.0     0.0.0.0          255.255.255.0   U     0       0        0 em2169.254.0.0      0.0.0.0         255.255.0.0     u      1003   0        0  em20.0.0.0         10.0.200.128   0.0.0.0         ug    0       0        0 EM2 add default gateway [email  protected] ~]# route add default gw 10.0.200.2 && route  -n Kernel IP routing tableDestination     Gateway          Genmask          flags metric ref    use iface10.0.200.0      0.0.0.0         255.255.255.0   u      0      0        0  em2169.254.0.0     0.0.0.0          255.255.0.0    &nBsp u     1003   0        0  em20.0.0.0         10.0.200.2      0.0.0.0         ug    0       0        0 em20.0.0.0          10.0.200.128   0.0.0.0          UG    0      0         0 EM2 The default route is only one, so to remove the old invalid default route [[Email protected] ~]# route del]  default gw 10.0.200.128 && route -n && ping  qq.comkernel ip routing tabledestination     gateway         &nBsp genmask         flags metric ref     Use Iface10.0.200.0     0.0.0.0          255.255.255.0   U     0       0        0 em2169.254.0.0      0.0.0.0         255.255.0.0     u      1003   0        0  em20.0.0.0         10.0.200.2      0.0.0.0         ug    0       0        0 em2 Finally, remember to update the configuration file:[[email  protected] ~]# sed -i  ' S/200.128/200.2/'  /etc/sysconfig/network-scripts/ifcfg-em1 && cat /etc/sysconfig/ Network-scripts/ifcfg-em1

Introduction to route usage