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  • "ping: unknown host www.baidu.com" 解决方法

    如果某台Linux服务器ping不通域名, 如下提示:

    # ping www.baidu.com
    ping: unknown host www.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
    -------------------------------------------------------------------
    nameserver 8.8.8.8
    nameserver 8.8.4.4
    -------------------------------------------------------------------

    2) 确保网关已设置

    # grep GATEWAY /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:

    # route add default gw 192.168.40.1

    或者手工编写/etc/sysconfig/network-scripts/ifcfg*文件后, 重启network服务:

    # service network restart

    3) 确保可用dns解析

    # grep hosts /etc/nsswitch.conf
    -------------------------------------------------------------------
    hosts:      files dns
    -------------------------------------------------------------------

    如果以上哪个有问题, 修正后, 再测试, 应该就没问题了:

    #ping -c 3 www.baidu.com
    PING www.a.shifen.com (220.181.6.175) 56(84) bytes of data.
    64 bytes from 220.181.6.175: icmp_seq=0 ttl=50 time=9.51 ms
    64 bytes from 220.181.6.175: icmp_seq=1 ttl=50 time=8.45 ms
    64 bytes from 220.181.6.175: icmp_seq=2 ttl=50 time=8.97 ms
    --- www.a.shifen.com ping statistics ---
    3 packets transmitted, 3 received, 0% packet loss, time 2002ms
    rtt min/avg/max/mdev = 8.450/8.977/9.511/0.446 ms, pipe 2

    --End--

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  • 原文地址:https://www.cnblogs.com/xingmeng/p/3221334.html
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