Solutions For Two Common vSphere Network Issues • Chris Colotti's Blog

Solutions For Two Common vSphere Network Issues

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I have found a couple common issues with vSphere Networking that you may have come across recently.  I have always been a long tim fan of the thinking…”If it looks like a duck, and sounds like a duck, it may very well be a duck”.  That being the thinking below is a few instances and associated KB articles that may very well help you out.

Use Case #1:

Reported Issue:  Customer reports loss of networking connectivity on a VM after Reboot.  The VM comes back with self assigned IP and specifically the work around is disconnecting and reconnecting the NIC in vCenter VM settings

Solution(s):  I have found that these two KB’s one or both combined, seems to work.  I have had people apply them in order and things seem to be resolved.

  1. http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1028373
  2. http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2012646

Use Case #2:

Reported Issue:  Customer reports poor networking performance on cross host VM’s specifically with the VMXNET driver and database applications, mostly on vSphere6 but also on some 5.5

Possible Solution(s):  I have found these two options or the combination of both fix the issue.

  1. Change to E1000 Driver OR
  2. Disable LRO on VMXNET3 using this KB:  http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2129176

About Chris Colotti

Chris is currently a Principal Architect at Cohesity. In his role he spends the majority of his time supporting Cohesity events and creating outward facing content. He also acts as an active interface between the field and engineering/product management as customer zero in the TAG production lab. Chris is active on the VMUG and event speaking circuit and is available for many events if you want to reach out and ask. Previously to this he spent close to a decade working for VMware as a Principal Architect. Previous to his nine plus years at VMware, Chris was a System Administrator that evolved his career into a data center architect. Chris spends a lot of time mentoring co-workers and friends on the benefits of personal growth and professional development. Chris is also amongst the first VMware Certified Design Experts (VCDX#37), and author of multiple white papers. In his spare time he helps his wife Julie run her promotional products as the accountant, book keeper, and IT Support. Chris also believes in both a healthy body and healthy mind, and has become heavily involved with fitness as a Diamond Team Beachbody Coach using P90X and other Beachbody Programs. Although Technology is his day job, Chris is passionate about fitness after losing 60 pounds himself in the last few years.

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