?????????Linux??????ping????????? ???????:
????[root@localhost ~]# ping www.baidu.com
????ping: unknown host www.baidu.com
????????????????????·??????????·??????????????????????????????????????
????[root@localhost ~]# ping 8.8.8.8
????PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
????64 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=2.96 ms
????64 bytes from 192.168.1.1: icmp_seq=2 ttl=64 time=1.75 ms
????????????????????????￡? ??????????2??????????:
????1) ????????????????????? ??е???? ????????Google?????DNS???? ????ò?????????
????[root@localhost ~]# cat /etc/resolv.conf
????search localdomain
??????????DNS????????????????ping????ping???????dns???????????
????[root@localhost ~]# vi /etc/resolv.conf
????nameserver 202.98.96.68
????nameserver 61.139.2.69
????2) ?????????????
????# grep GATEWAY /etc/sysconfig/network-scripts/ifcfg*
????/etc/sysconfig/network-scripts/ifcfg-eth0:GATEWAY=192.168.40.1
???????δ????? ????????·??????????:
????# route add default gw 192.168.40.1
?????????????д/etc/sysconfig/network-scripts/ifcfg*????? ????network????:
????service network restart
????3) ???????dns????
????grep hosts /etc/nsswitch.conf
????hosts:      files dns
???????????????????? ?????? ?????? ??????????:
????#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