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In general, it seems that the ping packets are blocked by firewall or
proxy gateway.<br>
<br>
Dave<br>
<br>
Edward King wrote:<br>
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<div><font size="2">My computer's OS is </font><font size="2">Red
Hat Linux7.3,I can ping this Linux computer from other computers,but in
this Linux computer,I ping publish net,I fount I can't ping it,and I
can't visit public net in Red Hat Linux7.3,for example:</font></div>
<div><font size="2">[root@www root]# ping <a
href="http://www.sina.com">www.sina.com</a><br>
ping: unknown host <a href="http://www.sina.com">www.sina.com</a></font></div>
<div> </div>
<div><font size="2">Then I try ping gateway,I got follow result:</font></div>
<div><font size="2">[root@www root]# ping 210.xx.xx.xx<br>
PING 210.xx.xx.xx (210.xx.xx.xx) from 210.xx.xx.xx : 56(84) bytes of
data.<br>
>From 210.xx.xx.xx icmp_seq=1 Packet filtered<br>
>From 210.xx.xx.x x icmp_seq=2 Packet filtered<br>
>From 210.xx.xx.xx icmp_seq=3 Packet filtered<br>
>From 210.xx.xx.xx icmp_seq=4 Packet filtered<br>
>From 210.xx.xx.xx icmp_seq=5 Packet filtered</font></div>
<div> </div>
<div><font size="2">--- 210.xx.xx.xx ping statistics ---<br>
5 packets transmitted, 0 received, +5 errors, 100% loss, time 4012ms</font></div>
<div> </div>
<div><font size="2">Then I try to ping DNS Server,I found I can't
ping it!</font></div>
<div><font size="2">[root@www root]# ping 210.x.x.x<br>
connect: Network is unreachable</font></div>
<div> </div>
<div><font size="2">Then I use Windows OS,I configure IP
address,gateway and DNS as same as Red Hat Linux7.3,I found I can ping
public net and visit public net,like follows:</font></div>
<div><font size="2">C:\Documents and Settings\Administrator>ping <a
href="http://www.sina.com">www.sina.com</a></font></div>
<div> </div>
<div><font size="2">Pinging us.sina.com.cn [66.77.9.79] with 32 bytes
of data:</font></div>
<div> </div>
<div><font size="2">Reply from 66.77.9.79: bytes=32 time=190ms TTL=237<br>
Reply from 66.77.9.79: bytes=32 time=181ms TTL=237<br>
Reply from 66.77.9.79: bytes=32 time=190ms TTL=237<br>
Reply from 66.77.9.79: bytes=32 time=181ms TTL=237</font></div>
<div> </div>
<div><font size="2">Ping statistics for 66.77.9.79:<br>
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),<br>
Approximate round trip times in milli-seconds:<br>
Minimum = 181ms, Maximum = 190ms, Average = 185ms</font></div>
<div> </div>
<div><font size="2">Why can't I ping and visit public net under Red
Hat Linux7.3? I am a beginer in Linux,please give me detail command.</font></div>
<div><font size="2">Thanks in advance!</font></div>
<div> </div>
<div><font size="2">Best regards,</font></div>
<div><font size="2">Edward</font></div>
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