Why Linux can't visit public net?

[Michael Schwendt]

On Thu, 02 Sep 2004 18:02:19 +0800, Edward King wrote:

> My computer's OS is 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:
> [root at www root]# ping www.sina.com
> ping: unknown host www.sina.com
> 
> Then I try ping gateway,I got follow result:
> [root at www root]# ping 210.xx.xx.xx
> PING 210.xx.xx.xx (210.xx.xx.xx) from 210.xx.xx.xx : 56(84) bytes of data.
> >From 210.xx.xx.xx icmp_seq=1 Packet filtered
> >From 210.xx.xx.x x icmp_seq=2 Packet filtered
> >From 210.xx.xx.xx icmp_seq=3 Packet filtered
> >From 210.xx.xx.xx icmp_seq=4 Packet filtered
> >From 210.xx.xx.xx icmp_seq=5 Packet filtered
> 
> --- 210.xx.xx.xx ping statistics ---
> 5 packets transmitted, 0 received, +5 errors, 100% loss, time 4012ms
> 
> Then I try to ping DNS Server,I found I can't ping it!
> [root at www root]# ping 210.x.x.x
> connect: Network is unreachable

Post the unmodified output of the following commands to add some
details:

  cat /etc/resolv.conf
  netstat -nr
  /sbin/ifconfig -a

Also describe what steps you did to configure your network.