Solved

Server unable to ping

Posted on 2012-03-30
6
989 Views
Last Modified: 2012-03-30
Hi,

we have a server that we can SSH to remoteley over the internet. But the server is unable to ping and domains or ip addresses outside its own network.

The server is running asterisk and that is working fine it can make calls fine. But it will not ping the voip ip server, which it is obviosuly communicating with to make calls!

Thanks
0
Comment
Question by:andybrooke
6 Comments
 
LVL 68

Expert Comment

by:woolmilkporc
Comment Utility
Seems that this server sits behind a firewall or router which would block ICMP (ping) traffic.

Such a setup is not uncommon.

wp
0
 
LVL 3

Expert Comment

by:eappiah
Comment Utility
Are you sure it's not firewall rule in your network to block PING/ICMP?
0
 
LVL 21

Expert Comment

by:motnahp00
Comment Utility
Did you enable a firewall rule to allow inbound and outbound ICMPv4 or ICMPv6 Echo Requests?
0
What Is Threat Intelligence?

Threat intelligence is often discussed, but rarely understood. Starting with a precise definition, along with clear business goals, is essential.

 
LVL 68

Expert Comment

by:woolmilkporc
Comment Utility
A quote from "serverfault.com" explaining why it could make sense blocking ICMP:


It's possible, for example, for a malicious piece of software on a compromised system to send messages "back home" via fake echo replies. This could give the remote listening system quite a bit of information that you don't necessarily want it to have, one little piece at a time. Anything the malware has access to could go right out the pipe.

http://serverfault.com/questions/55889/why-block-outbound-icmp
0
 
LVL 8

Accepted Solution

by:
gpizzuto earned 500 total points
Comment Utility
Check, if you have 2 network adapters, if the gateway's values as set up correctly.
The ping could arrive to the server, but it replies throught the other adapter
0
 

Author Comment

by:andybrooke
Comment Utility
service iptables stop is enabled on boot and its off. I checked the router draytek 2830 and all looks ok.... I can ping the router externally
0

Featured Post

Highfive + Dolby Voice = No More Audio Complaints!

Poor audio quality is one of the top reasons people don’t use video conferencing. Get the crispest, clearest audio powered by Dolby Voice in every meeting. Highfive and Dolby Voice deliver the best video conferencing and audio experience for every meeting and every room.

Join & Write a Comment

Linux users are sometimes dumbfounded by the severe lack of documentation on a topic. Sometimes, the documentation is copious, but other times, you end up with some obscure "it varies depending on your distribution" over and over when searching for …
Join Greg Farro and Ethan Banks from Packet Pushers (http://packetpushers.net/podcast/podcasts/pq-show-93-smart-network-monitoring-paessler-sponsored/) and Greg Ross from Paessler (https://www.paessler.com/prtg) for a discussion about smart network …
Learn several ways to interact with files and get file information from the bash shell. ls lists the contents of a directory: Using the -a flag displays hidden files: Using the -l flag formats the output in a long list: The file command gives us mor…
This demo shows you how to set up the containerized NetScaler CPX with NetScaler Management and Analytics System in a non-routable Mesos/Marathon environment for use with Micro-Services applications.

743 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

16 Experts available now in Live!

Get 1:1 Help Now