Solved

Some virtual machines unable to connect to network and internet from Server 2008 R2 w/Hyper V

Posted on 2010-08-24
11
606 Views
Last Modified: 2012-05-10
virtual machines are not able to connect to network or internet today but were able to just last week.  this does not apply to all of the virtual machines, one continues to connect out
0
Comment
Question by:dmaxIT
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 6
  • 5
11 Comments
 
LVL 4

Expert Comment

by:Geek_Nabil
ID: 33512510
Did you recently update or modify your Hyper-V? Any ISA Servers in the network, check the configuration, it might be blocking access.

What are the guest OS's running on the Hyper-V?
0
 

Author Comment

by:dmaxIT
ID: 33512569
Not sure what may have changed - there are 2 users with access and creating guests - I think someone did something, but I cannot see any difference in network setup between guests.  There are no ISA servers to contend with.  The guest machine(s) are XP SP3.  Thanks for any ideas
0
 
LVL 4

Expert Comment

by:Geek_Nabil
ID: 33512664
Check any recent Service Pack Installation, Check the guest tools are installed and up-to-date (try reinstalling the guest tools), Check the Host Firewall Configuration, try disabling it and test.
0
Get 15 Days FREE Full-Featured Trial

Benefit from a mission critical IT monitoring with Monitis Premium or get it FREE for your entry level monitoring needs.
-Over 200,000 users
-More than 300,000 websites monitored
-Used in 197 countries
-Recommended by 98% of users

 

Author Comment

by:dmaxIT
ID: 33514270
no recent SP installs on either Host or Guest.  Guest Services reinstalled. No firewall enabled.  
0
 
LVL 4

Expert Comment

by:Geek_Nabil
ID: 33517006
I want you to check the MAC address of every machine and tell me if they are the same.
0
 

Author Comment

by:dmaxIT
ID: 33520699
owner of project machine reports that none of the virtual machines have the same MAC
0
 
LVL 4

Expert Comment

by:Geek_Nabil
ID: 33524154
Remove the Virtual Network Adapter while the guest OS is running, and add it again, also if you are using a bridged connection on the Virtual Network Adapter, check your network switch configuration, perhaps there is a limit on the number of MAC addresses per Network Port.

Also Try using a Host only network connection on the Virtual Network Adapter, if the problem is solved in the guest OS, you should check your network set-up.
0
 

Author Comment

by:dmaxIT
ID: 33529961
we have determined we can create a new XP virtual machine from "scratch" and it will connect to the network and beyond without any problem - any new virtual machine created from an existing machine "template" will not be able to connect -- the owner of the machine contends this was not an issue up until this week.
0
 
LVL 4

Expert Comment

by:Geek_Nabil
ID: 33530028
So the problem is not in the hyper-V or network, it is in the virtual os,
do you have any backups or snapshots of the virtual machine, when things worked.
0
 

Accepted Solution

by:
dmaxIT earned 0 total points
ID: 33535014
OK, got to the root of the issue -- The host machine is in a very small segment that has been configured for distribution via DHCP.  If the machine owner shuts down a running virtual machine and brings up a different one, it will connect out successfully.  If she powers up another virutal machine at the same time, it will not connect out. She can power off the working one and the 2nd one will now connect out.  The IP range is not one I really want to allow DHCP for - not sure why this small group was allowed in the first place, but it's there.  Anyway, I have some direction to look at for a long-term resolution, but some decisions to be made .....  Thanks for all your ideas and suggestions
0
 
LVL 4

Expert Comment

by:Geek_Nabil
ID: 33539363
Glad i could helo you realise your problem.
0

Featured Post

Get 15 Days FREE Full-Featured Trial

Benefit from a mission critical IT monitoring with Monitis Premium or get it FREE for your entry level monitoring needs.
-Over 200,000 users
-More than 300,000 websites monitored
-Used in 197 countries
-Recommended by 98% of users

Question has a verified solution.

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

Preface Having the need * to contact many different companies with different infrastructures * do remote maintenance in their network required us to implement a more flexible routing solution. As RAS, PPTP, L2TP and VPN Client connections are no…
INTRODUCTION The purpose of this document is to demonstrate the Installation and configuration of the Data Protection Manager product. Note that this demonstration was prepared on the basis of Windows OS is 2008 R2 and DPM 2010. DATA PROTECTI…
Windows 8 came with a dramatically different user interface known as Metro. Notably missing from that interface was a Start button and Start Menu. Microsoft responded to negative user feedback of the Metro interface, bringing back the Start button a…
With the advent of Windows 10, Microsoft is pushing a Get Windows 10 icon into the notification area (system tray) of qualifying computers. There are many reasons for wanting to remove this icon. This two-part Experts Exchange video Micro Tutorial s…

630 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