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VMWare ESXi vDistrib Switch problem

vmware esxi 5.1

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#1 garethevans1986



  • Joined: 01-April 04
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Posted 08 January 2013 - 12:12


I have a ESXI cluster setup running VMWare ESXI 5.1.

I have a distributed switch which, when 5 vms are connected to it, only 2 can ping eachother.

I can move the same vms to another distributed switch (on another port group) and they all ping fine.

Security is all set to Accept.

Any ideas why or any pointers as to how to sort it?

Thank you

#2 +BudMan


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Posted 08 January 2013 - 13:58

Can you post your network setup from your esxi host showing us these devices on the port group on the same switch, etc.

As to not being able ping - software firewalls come to mind, many even the windows one block ping by default. Are they on the same network, wrong netmask can screw you up ;)

Are you trying to ping via name or IP? Ping by IP, if does not answer look in the arp table of the pinging machine - does it show the mac of the IP your trying to ping? If not then yeah you have a bit of a problem, never going to ping if can not arp for the mac. If shows a mac, is the mac correct for the IP your trying to ping.

I would assume your on windows vms? You can view your arp table with arp -a


C:\Windows\system32>arp -a

Interface: --- 0xc
  Internet Address	  Physical Address	  Type		   00-0c-29-dd-02-ba	 dynamic		   00-0c-29-57-41-d5	 dynamic		  00-13-b6-02-6c-09	 dynamic		  b8-27-eb-1c-6e-09	 dynamic		  2c-76-8a-ad-f6-56	 dynamic		  00-15-99-21-1c-a0	 dynamic		  00-06-dc-43-ad-78	 dynamic		 00-22-5f-90-a3-a2	 dynamic		 00-0c-29-ff-f4-2b	 dynamic		 00-50-56-00-00-02	 dynamic		 ff-ff-ff-ff-ff-ff	 static		   01-00-5e-00-00-fb	 static	   01-00-5e-7f-ff-fa	 static	   ff-ff-ff-ff-ff-ff	 static


#3 sc302


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Posted 08 January 2013 - 18:12

network connection settings in your vm host would be good

#4 OP garethevans1986



  • Joined: 01-April 04
  • Location: Gogledd Cymru / North Wales

Posted 08 January 2013 - 21:39


Thanks for the replies....I've found what was causing the problem.

My cluster has 2 Hosts in, each host has 6 physical NICs in....but only 4 plugged into anything (separate networks).

I've created a distrib switch using a non connected NIC meaning the VMs on one host will communicate but the ones on the other host wont due to the lack of switch inbetween.

Which means I need to get another switch tommorow :)