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stupid arp question

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Last Modified: 2012-05-09
I am trying to find information on a situation at work..

We have two device that communicate accross the wan via ethernet

one day they stopped communicating even though any other device can communicate with it.

I decided that we should remove the device which is a hardware device but not a pc without ability to ping. I than said that we should take a laptop configure it to the devices IP address and ping to see whats going on. I was told by the cisco guy that the arp cahce in the routers take 8 hours to update in a network like this

PC ---- Switch --- router ---- Cloud ---- router ---- switch ------ device

if we remove the device we have to wait 8 hours or restart all the equipment because the cisco devices will not be able to route until the arp cache is updated becuase the old MAC even though it is dynamic will not update

I think this is not realistic any instight would be appreciated

thanks
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