Solved

VMs on the same host cannot communicate

Posted on 2014-12-02
8
213 Views
Last Modified: 2014-12-18
I have 2 VMs on the same ESXi 5.0 host, on the same vmswitch; they are the only VMs on this host.  They can communicate with the rest of the network with no problem and they can also browse the Internet, but they cannot ping or browse each other. The Windows firewall is turned off on both machines.  I have eliminated any DNS issues (one of the machines is DC and DNS server, and there is another DC/DNS server on the network as well), TCP/IP configuration issues, etc.  File and Printer Sharing is turned on for both servers. One is running Windows 2008R2 Standard, and the other is Windows 2008 Standard. The only conclusion I can reach is that it's something in the ESXi configuration.  Any ideas would be appreciated.
0
Comment
Question by:Hypercat (Deb)
8 Comments
 
LVL 6

Expert Comment

by:ajeab
ID: 40476722
did you check gateway setting?
0
 
LVL 38

Author Comment

by:Hypercat (Deb)
ID: 40476822
Yes, as I said, both machines can browse the Internet, so their gateway settings are correct.
0
 
LVL 80

Expert Comment

by:David Johnson, CD, MVP
ID: 40476867
are they in the same subnet and vlan?
0
NAS Cloud Backup Strategies

This article explains backup scenarios when using network storage. We review the so-called “3-2-1 strategy” and summarize the methods you can use to send NAS data to the cloud

 
LVL 119
ID: 40476872
Have you checked ALL the network settings are the same, Subnet Mask ?

Firewall Disabled on both Hosts?

VMXNET3 interface installed, and VMware Tools ?
0
 
LVL 38

Author Comment

by:Hypercat (Deb)
ID: 40476955
@david - There is only one vlan. All devices at this site are in the same subnet, so if one or both of these machines had the wrong subnet, they wouldn't be able to communicate with anything else on the network.  This is a very simple network, about 65-70 devices total, one network/subnet, one hardware firewall router at the edge.

@andrew - same answer on the network settings.  Windows firewall is disabled by group policy, but I double-checked and it is definitely disabled for all profiles. They are using an E1000 driver for the network interface. I've never had a problem with these, but I could change it if you think it might fix the problem.  VMWare Tools are installed and the service is running.
0
 
LVL 119

Accepted Solution

by:
Andrew Hancock (VMware vExpert / EE MVE^2) earned 500 total points
ID: 40476984
Never use the E1000 for production, only use E1000 for installation.

Replace with VMXNET3, many more benefits.
0
 
LVL 13

Expert Comment

by:Mark Galvin
ID: 40478023
Have you checked DNS is configured correctly?
0
 
LVL 38

Author Closing Comment

by:Hypercat (Deb)
ID: 40506936
Changing to the VMXNET3 driver even on just one of the virtual machines fixed the problem. I'm amazed that this made such a difference, especially since when you create a new virtual machine, ESXi defaults to using the E1000 driver for the NIC card. IMO, they ought to change this default if using the older driver can cause this kind of problem on the newer versions of ESXi.  Thanks!
0

Featured Post

Does Powershell have you tied up in knots?

Managing Active Directory does not always have to be complicated.  If you are spending more time trying instead of doing, then it's time to look at something else. For nearly 20 years, AD admins around the world have used one tool for day-to-day AD management: Hyena. Discover why

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In this article, I will show you HOW TO: Create your first Windows Virtual Machine on a VMware vSphere Hypervisor 6.5 (ESXi 6.5) Host Server, the Windows OS we will install is Windows Server 2016.
Giving access to ESXi shell console is always an issue for IT departments to other Teams, or Projects. We need to find a way so that teams can use ESXTOP for their POCs, or tests without giving them the access to ESXi host shell console with a root …
This tutorial will give a short introduction and overview of Backup Exec 2012 and how to navigate and perform basic functions. Click on the Backup Exec button in the upper left corner. From here, are global settings for the application such as conne…
This video shows you how to use a vSphere client to connect to your ESX host as the root user. Demonstrates the basic connection of bypassing certification set up. Demonstrates how to access the traditional view to begin managing your virtual mac…

856 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question