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I am using Cent OS 6.4 and it is in a official lab.

ping google.com gives the below output and hangs:

[root@LAB1 ~]# ping google.com
PING google.com (74.125.236.195) 56(84) bytes of data.

ping 8.8.8.8 also yields the same result. I am able to access internet from browser(Mozilla). Is there a problem with the network settings or configuration?

Below is the output from traceroute - n 8.8.8.8 [root@LAB1 ~]# traceroute -n 8.8.8.8 traceroute to 8.8.8.8 (8.8.8.8), 30 hops max, 60 byte packets
1 * * *
2 * * *
3 * * *
4 * * *
5 * * *
6 *^Z

Below is the output from route -n if it helps

[root@LAB1 ~]# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.1.0 0.0.0.0 255.255.255.0 U 1 0 0 eth0
0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 eth0

As I am new to networking, I am not able to identify the issue. Any help here is much appreciated...

Edit : The main reason for me to try the above ping is to resolve an yum update command that fails to resolve the mirror sites...

Siva
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1 Answers1

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ICMP is'nt allowed outgoing through the firewall / router behind you are accessing Internet.

This 

[root@LAB1 ~]# ping google.com
PING google.com (74.125.236.195) 56(84) bytes of data.

And the fact you can browse the web means you are resolving google.com (DNS protocol)

traceroute use ICMP two.

Kuruwan
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  • Archinoa is probably right... you may get closer to confirmation if ping is also unsuccessful for any other external IP address you try. – James Nov 13 '13 at 19:52
  • `ICMP is'nt allowed outgoing through the firewall / router behind you are accessing Internet` ... really? – hek2mgl Nov 13 '13 at 19:58
  • Thanks for the quick responses...@James, other external IP addresses are also not working...Now, the main reason I am trying this ping is because, yum update doesn't work... it gives a PYCURL 6 error and says hosts could not be resolved...could these be related? Is there a way to resolve these issues? – Siva Nov 13 '13 at 20:19
  • Is it only showing error about this package ? Otherwise maybe you need to comment out some repository entry in the file /etc/yum.repos.d. Yum is reaching repository by http, so icmp isn't matter here. Good luck – Kuruwan Nov 13 '13 at 20:46
  • Thanks a lot for the help Archinoa. I have posted a separate question for the yum update failure in superuser. I will accept your answer as I got the point that ping uses ICMP which is blocked through the firewall and since the actual issue is with Yum update, I will not try ping anymore to check for internet access :). – Siva Nov 15 '13 at 15:58