linux网络不可达

[root@mysql51 ~]# systemctl stop NetworkManager    //配置网关，需先停止网络管理  

[root@mysql51 ~]# route -n                  //查看网关Gateway      

Kernel IP routing table

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface

192.168.4.0     0.0.0.0         255.255.255.0   U     100    0        0 eth0

192.168.122.0   0.0.0.0         255.255.255.0   U     0      0        0 virbr0

[root@mysql51 ~]# route add default gw 192.168.4.50                

    route: SIOCADDRT: Network is unreachable    //配置网关，出现网络不可达，重新配置ip

[root@mysql51 ~]# route add default gw 192.168.4.50

[root@mysql51 ~]# route -n

Kernel IP routing table

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface

0.0.0.0         192.168.4.50    0.0.0.0         UG    0      0        0 eth0      

192.168.4.0     0.0.0.0         255.255.255.0   U     100    0        0 eth0

192.168.122.0   0.0.0.0         255.255.255.0   U     0      0        0 virbr0