linux系统:\"ping: unknown host www.baidu.com\"
"ping:unknownhostwww.baidu.com"
解决方案：
如果某台Linux服务器ping不通域名,如下提示:
#pingwww.baidu.com
ping:unknownhostwww.baidu.com
如果确定网络没问题的情况下,可以通过如下步骤寻找解决办法:
1)确定设置了域名服务器,没有的话,建议设置Google的公共DNS服务,它应该不会出问题的
#cat/etc/resolv.conf
-------------------------------------------------------------------
nameserver8.8.8.8
nameserver8.8.4.4
-------------------------------------------------------------------
2)确保网关已设置
#grepGATEWAY/etc/sysconfig/network-scripts/ifcfg*
-------------------------------------------------------------------
/etc/sysconfig/network-scripts/ifcfg-eth0:GATEWAY=192.168.40.1
-------------------------------------------------------------------
如果未设置,则通过如下方式增加网关:
#routeadddefaultgw192.168.40.1
或者手工编写/etc/sysconfig/network-scripts/ifcfg*文件后,重启network服务:
#servicenetworkrestart
3)确保可用dns解析
#grephosts/etc/nsswitch.conf
-------------------------------------------------------------------
hosts:filesdns
-------------------------------------------------------------------
如果以上哪个有问题,修正后,再测试,应该就没问题了:
#ping-c3www.baidu.com
PINGwww.a.shifen.com(220.181.6.175)56(84)bytesofdata.
64bytesfrom220.181.6.175:icmp_seq=0ttl=50time=9.51ms
64bytesfrom220.181.6.175:icmp_seq=1ttl=50time=8.45ms
64bytesfrom220.181.6.175:icmp_seq=2ttl=50time=8.97ms
---www.a.shifen.compingstatistics---
3packetstransmitted,3received,0%packetloss,time2002ms
rttmin/avg/max/mdev=8.450/8.977/9.511/0.446ms,pipe2
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