What to ping or what not to ping, that is the question…
So we use our cisco devices to have two internet connections for a network and configure sla’s on both so for example: 5 ping time outs = the connection is now unavailable and all traffic is diverted to the other link. But who do you ping? I ask this because we ping public dns servers and recently one of them was flapping up and down and hence affected remote control sessions and the general sanity of employees.
So who do you ping?
Its obvious now we cant rely on random public dns servers.
How about your internet gateway one hop out of the office? I think its too close and assumes too much that beyond that gateway, everything is fine. so you could still be getting ping replies but packets are dropping 2 hops away.
How about a core isp router? or core backbone router? well those ip addresses can change at the isp’s discression without notice so thats no good.
i guess it has to be something out on the internet thats absolutely reliable and never goes down – ehhe, i dont think it exists!
Herein lies my dilemma – what to ping?