ping百度(外网)出现：unknown host www.baidu.com问题解决
ping 百度出现：(ping www.baidu.com)
"ping: unknown host www.baidu.com"
ping 网关确定是否连接上路由器，并且路由器是否连接上网：
[root@vmhost ~]#
ping 192.168.8.1
PING 192.168.8.1 (192.168.8.1) 56(84) bytes of data.
64 bytes from 192.168.8.1: icmp_seq=1 ttl=254 time=513 ms
64 bytes from 192.168.8.1: icmp_seq=2 ttl=254 time=1112 ms
64 bytes from 192.168.8.1: icmp_seq=3 ttl=254 time=594 ms
64 bytes from 192.168.8.1: icmp_seq=4 ttl=254 time=85.4 ms
检查DNS服务是否已经设置
[root@localhost ~]#
cat /etc/resolv.conf
[root@localhost ~]#
vi /etc/resolv.conf
里面文件为空,则新添加一条DNS到该文件中：
search localdomain
nameserver 119.29.29.29
确认网关已设置(RHEL系统)
[root@vmhost ~]#
vi /etc/sysconfig/network-scripts/ifcfg-eth0
network=192.168.8.1
判断route是否有此路由并添加
[root@vmhost network-scripts]#
route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.8.0 * 255.255.255.0 U 0 0 0 eth0
169.254.0.0 * 255.255.0.0 U 0 0 0 eth0
[root@vmhost network-scripts]#
route add default gw 192.168.8.1
[root@vmhost network-scripts]#
route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.8.0 * 255.255.255.0 U 0 0 0 eth0
169.254.0.0 * 255.255.0.0 U 0 0 0 eth0
default 192.168.8.1 0.0.0.0 UG 0 0 0 eth0
重启network服务
[root@vmhost network-scripts]# service network restart
测试结果(成功):
[root@vmhost network-scripts]# ping www.baidu.com
PING www.a.shifen.com (14.215.177.37) 56(84) bytes of data.
64 bytes from 14.215.177.37: icmp_seq=1 ttl=54 time=30.9 ms
64 bytes from 14.215.177.37: icmp_seq=2 ttl=54 time=49.7 ms