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NIC dropping pings, not a hardware problem

Posted on 2008-11-01
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Last Modified: 2013-11-09
Hi,

I have 2 server on the same network of the same name. I never have them running together so there is never a problem. I made the mistake of brining them both up at the same time yesterday and now when I shut one down the other (which is the one I need running) is dropping pings intermittently.

Both servers are running on ESX VMware on different hardware. I assume it's an ARP table somewhere that's causing the problem but not sure where?

Any ideas?
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Question by:wannabecraig
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paulsolov earned 250 total points
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If they're both on a windows domain than you may have a bigger issue. If not then you have a few places where you need to clear the cache: ESX Servers, switch, router, etc..
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by:giovannicoa
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Hi,

to speed up resolving this issue try to remove the actual virtual nic and add a new one.
This is the same as removing and reinstalling a nic from a physical machine.
Obviously assign the same network address and configuration.

Hope this can help you,
Giovanni Coa
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by:wannabecraig
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I know I can remove and add a NIC, but I don;t want to. That's a work around, I'm looking to resolve the issue and want to know what to do when it happens again.

The are on a Windows site, but not part of the Domain. I'm pinging the ip Address so not a DNS issue either. Nearly sure it's the ESX ARP table that needs to be cleared but not sure where that is,
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by:giovannicoa
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You can check ARP table on your switches and see if the MAC ADDRESS is present on more than LAN port. In that case you probably have two identical MAC addresses on two Virtual Machines.
Sometimes cloning, importing Virtual Machines can be the cause.

Hope this can help you,
Giovanni Coa
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by:giovannicoa
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Any news about that ?

Giovanni Coa
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