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Determine the point of failure of a network outage

Posted on 2013-10-22
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Last Modified: 2013-10-22
I have a connection between two NOCs that intermittently goes down. Both NOCs point the finger at the other for the problem.

Does anyone know of a method or software that I can use to determine where the failure is. It often occurs at night. I prefer to run this from a windows machine, I can use Linux if need be.

I would need to monitor the connection and trace the outage when there is a failure.
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Question by:jimmylew52
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by:akhalighi
ID: 39591132
it seems you need more information about infrastructure to find out the root cause. how these two NOCs are connected ? through VPN ? or through a dedicated link ( like MPLS) .

based on your answer ; I'd add more monitoring , so instead of pinging a remote host ; I also ping devices in the middle like gateways , routers and internet connections.
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by:jimmylew52
ID: 39591363
NOCs are connected through a VPN.

I agree on the pinging but I have not been able to do this manually. The connection goes down at odd times and I have not been able to get to it fast enough.

I need something that will check the connection every minute or two and run the series of pings or traces when the link is down and send or store the results.

When the link is down I do not have access to the NOCs to do the troubleshooting.
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akhalighi earned 500 total points
ID: 39591770
you can add ping sensors to your monitoring system to ping more points, then whenever the issues happens you will see what else went down . this helps you to trobleshoot the problem.

this doesn't even need you to be awake ; you can troubleshoot based on the alerts ( in the morning ) .

on a side note , if they are connected through a site to site VPN ; it's likely that something happens over the night on the tunnel ( e.g. VPN re-keying ) , did you check the firewalls ? any log files ?
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by:jimmylew52
ID: 39592046
I don't see anything in the logs. I have setup some additional monitoring and I will see what I can find there.
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