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TsooRad is a blog for John Weber. John is a Skype for Business MVP (2015-2016) - before that, a Lync Server MVP (2010-2014). My day job is titled "Technical Lead, MS UC" - I work with an awesome group of people at CDW, LLC. I’ve been at this gig in one fashion or another since 1988 - starting with desktops (remember Z-248’s?) and now I am in Portland, Oregon. I focus on collaboration and infrastructure. This means Exchange of all flavors, Skype, LCS/OCS/Lync, Windows, business process, and learning new stuff. I have a variety of interests - some of which may rear their ugly head in this forum. I have a variety of certifications dating back to Novell CNE and working up through the Microsoft MCP stack to MCITP multiple times. FWIW, I am on my third career - ex-USMC, retired US Army. I have a fancy MBA. One of these days, I intend to start teaching. The opinions expressed on this blog are mine and mine alone.

2014/09/23

Duplicate IP error

Just ran into a little something I have not seen in a long time. Building edge servers with Windows Server 2012R2 and the external NIC kept coming up as duplicate address. Doing all the cross checking showed that the server had only two interfaces and that they were configured properly. Turns out that this little gem from 2008 R2 days is still valid:

http://social.technet.microsoft.com/forums/windowsserver/en-US/d7bda315-6366-4e0a-bdcf-dc875ff6963e/win-2008-r2-servers-will-not-connect-to-network-says-duplicate-ip

The firewall doing the NAT to the public IP was ASA. The registry change for disabling gratuitous ARP fixed all of the my edges.

This might be of interest also:  http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1028373

YMMV

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