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mmmooo
on Oct 23, 2014
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Migrating from AWS to AWS
This sounds like arp cache. And can be "fixed" by arping (forced arp responses without a who has)
matthavener
on Oct 24, 2014
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Yup, EC2 instances should be issuing a gratuitous arp on startup. I've seen the same thing on subnets with a lot of DHCP churn due to constantly rebooting embedded devices.
stevekemp
on Oct 24, 2014
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Pretty much textbook symptoms of arp-caching.
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