Hyper-V NAT networking

Hi everyone..
I'm educating myself within IT and I'm going to school at the moment. I've got the task of greating a virtual environment with a Windows Server 2012 and a client with a OS of my own choice (Win7 or 8). I'm using Hyper-V and wanna set up a NAT function (because
I'm told by me teacher that I have to), but can't seem to find a way to do this. The only remotely close solution I've found is Internet sharing, where I share my physical NIC with my virtual switch in Hyper-V, but my teacher insists, that there is a way to
do this, but he won't tell me how.
So I hope some of you smart guys (and girls) have the right solution here???
Kind regards
A helpless student... :-)

Hi nf69,
(when you create the external virtual swtich you can check "Allow managementoperating system..." to create a virtual NIC for host )
Best Regards
Elton Ji
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Similar Messages

Can't establish internet connection with NAT network in Oracle virtualbox

Hi all,
I am new to Oracle virtualbox. I have created a new virtual machine with Oracle linux 5.5 (64bit). I have enabled the NAT networking adaptor so as to access internet connection from the VM. But I am not able to do so.
Here are the network settings in the VM
1. Automatically obtain IP address settings with DHCP
2. Firewalls are disabled.
The 'eth0' device shows active status. The #ifconfig command lists "inet address" as 10.0.2.15.
Please let me know if any additional configuration is required for establishing the internet connection in the VM.

The NAT engine of Virtualbox automatically provides a router between the network interface of your host system and the virtual network interface of your guest OS and offers the same DNS servers to the guest that are configured on the host.
For more information how it works, see http://www.virtualbox.org/manual/ch06.html#network_nat.
The problem you are experiencing is most likely with the network configuration of your host system.

On UPnP and NAT (Network Address Translation)

Why UPnP is an often asked Question.
This article goes a long way to say why.
A couple of Quotes
*What is UPnP?*
Universal Plug and Play (UPnP) is an architecture for pervasive peer-to-peer network connectivity of PCs and intelligent devices or appliances, particularly within the home. UPnP builds on Internet standards and technologies, such as TCP/IP, HTTP, and XML, to enable these devices to automatically connect with one another and work together to make networking - particularly home networking - possible for more people.
*Are there other ways to solve the problem of NAT traversal? If so, why is using UPnP the best choice?*
Yes, there are other ways to solve this problem, but no other mechanism currently exists as an industry standard to address this problem in an automatic way for the consumer and in such a universally-applicable way for the developer.
Simply Automated Starter Package
Other approaches require either manual intervention by the user or they require special development efforts by the Internet gateway device vendor and the software developer to handle the NAT traversal needs of specific applications. As a result, UPnP is uniquely able to solve this important problem.
*Consumer does the work.* The manual intervention methods of NAT traversal require a consumer to use a browser, a graphical user interface-based tool on the PC, or a command line interface tool on the PC to change some settings on the Internet gateway device in the home. While some technical enthusiast users have little difficulty with this, many consumers do not feel comfortable doing this. Further, many consumers may not even realize that NAT traversal problems are interfering with their use of services across the Internet. _The user may be attempting to play a multi-player game or engage in some other peer-to-peer service but find he or she cannot connect for some reason._ This leads to troubleshooting, support calls, customer dissatisfaction, and reluctance on the part of the user to try new services or experiences in the future.
*Developer does the work.* To avoid requiring the consumer to solve this NAT traversal problem manually, some Internet gateway device vendors have written and included application layer gateway support into their devices. This application layer gateway software is designed with specific applications in mind. In other words, the device vendor writes and tests specific code that will automatically enable one application to go through the NAT. If the application software is updated, the application layer code the device vendor wrote may have to be updated and tested again. This one-at-a-time way of chasing the NAT traversal problem is manageable for device vendors when there are only a few peer-to-peer or relevant applications to consider, but this approach does not scale well to 100s or 1000s of applications, can be very expensive to pursue, and likely requires specific knowledge of how each of these applications function. The better way to approach this problem is to have the device vendor add software or firmware to their device once to understand UPnP and have other devices and software be able to communicate with the NAT device using this same technology. UPnP is uniquely able to fulfill this role today.
I have underlined a passage in the last.
I hope this helps in some way.
6:58 PM Tuesday; January 1, 2008

          Look for bindAddr in the weblogic.properties doc.
          weblogic.system.bindAddr
          You can use a dns name instead of an ip address
          Mike
          David Chen <[email protected]> wrote:
          >We are planning to add a client that needs to access our weblogic cluster
          >through firewalls with IP address translation. According to the WebLogic
          >(5.1) documentation, this could be done by opening port 7001 in the
          >firewalls, and BIND WebLogic SERVER INSTANCES TO DNS NAMES. Does anyone
          >know how to bind WebLogic server instances to DNS names? Should it be
          >done in weblogic.properties?Thanks in advance,David [email protected]

Windows 7 Hyper V Guest Network Connectivity

Hello (I posted this question over in the Microsoft VM Converter forum, not sure if that's the right place)
I am using Hyper-V Manager in Server 2012 R2 and have created guest vm's that are Windows 8 and Windows 10. All work fine and can connect to the network and have internet access (this is a dev environment). However, when I create a Windows
7 guest, it does not pickup an IP from DHCP and I cannot get it to connect at all. Ive tried the following:
1. Installed Integration Services setup.
2. Used both legacy and non legacy network adapters.
3. Uninstalled/reinstalled HyperV network adapter in guest OS
4. Disabled IPv6 in guest OS.
5. Set static IP address in guest OS and reserved in DNS.
6. Manually assigned DNS server in guest OS.
I then tried to create a guest Win7 OS on my Windows 8.1 host and experience the same issue, no connectivity. In both instances I get a 169.254.x.x. address. Is this some issue with Win7 and the latest Hyper-V version? As I mentioned Windows
8, 8.1, and 10 work just fine.
Thanks.

Hi Marshal21,
>>However, when I create a Windows 7 guest, it does not pickup an IP from DHCP and I cannot get it to connect at all.
In vm settings please ensure that the Windows7 VM connects to the correct external virtual switch .
If there is VLAN setting you also need to check VLan in VM settings .
Also you may try to download a new Win7 ISO and test again.
Best Regards
Elton Ji
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Removing Logical Networks and Subnets from Hyper-V Host Network Adapters that are greyed out

Hello All
I am new to SCVMM 2012 R2 and I have create a Hyper-V Cluster and now creating Logical Networks and Port Profiles and Logical Switches. I have figured out how to create all of them properly now, but I have made some mistakes in the past. I have a Logical
Switch created and assigned to network adapters on the hosts. Now I am trying to add the other switches to other adapters, but I have associations on network adapters to Logical Switches and Subnets that are not correct and need to be removed so I can add
the correct ones, but in the console the network adapters that I need to work with the information is grayed out and I can't change the information.
I am not an expert at Powershell. Below you can see a Logical Network and Sunets associated
to a Network adapter. Can someone help figure out how to remove the information so I can assign the correct Logical Network?
I woul so much appreciate this. I know there is a way to do this in
PowerShell but I don't know Powershell that much. I
am savoing all the
powershell scripts ever time I configure something in SCVMM but I have had no luck trying to
revearse what I did.
Help Please
Christopher
Christopher Scannell

This shows that an Uplink profile associated with this host, links to these logical networks. In order to remove this successfully, you must remove the logical switch and uplink deployed to the hosts.
For a complete overview and guidance on the required configuration, have a look at the whitepaper we created.
http://gallery.technet.microsoft.com/Hybrid-Cloud-with-NVGRE-aa6e1e9a
-kn
Kristian (Virtualization and some coffee: http://kristiannese.blogspot.com )

Server 2012 r2 Hyper-v guest network speed with 10 GB NIC's

Hi
Setting up a Server 2012 r2 Hyper-v host with an onboard 4 port 1 GB nic and a offboard dual port 10 GB nic. We are using the 1gb quad port for management. The 10 Gb we intend using for hyper-v guest use however we don't seem to be able to achieve very high
speeds though the 10 GB adapter when assigned to a virtual switch. Testing the 10 Gb nic from the host confirms that we can transfer/get 10 GB speeds. When assigned to a virtual switch however the speed drops to about 1-2 Gbps. Has anybody seen anything like
this ?. We've tried a variety of settings and i can confirm that the network traffic is using the 10 GB nic.

Hi,
I am almost certain what you see is by design. I don't want to go into to much detail because I'm in a bit of a hurry. But allow me to explain.
Suppose you have a 10Gb NIC interface and an multi-core CPU. When you have RSS (Receive-Side Scaling) disabled a single core can normally handing
around 2.5-4.3Gbps. When you enable RSS the data streams/traffic is spread across multiple cores.
But RSS is a network optimization feature for the Management OS, not for a vSwitch. Instead you should use VMQ (Virtual Machine Queuing). VMQ is
the equilavant of RSS, but then intended for VMs. But... there is a difference. VMQ does not spread single data streams/traffic across multiple cores. Instead is (dynamically) assigns each vmNIC its own core. So... you don't use multiple-cores at a time for
a single vmNIC. You can't use RSS and VMQ at the same time. Keep that in mind.
But... you can accomplish this by enabling vRSS as well. That's another story.
If you watch the following video, at the end you know all about VMQ.
Hyper-V dVMQ
http://www.hypervrockstar.com/tag/dvmq/
Boudewijn Plomp | BPMi Infrastructure & Security
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Error using Window Server Backup on 2012R2 Hyper-V to network share

Hi
I have a Windows 2012 R2 Hyper-V server. It runs a Windows 2012 R2 VM (called
server-1).
I want to backup the VM to a network location (\\network-1\server-1_backup$). To do this, I installed Windows Server Backup from the command line and configured a backup to look like this:
C:\Users\admin>wbadmin enable backup
wbadmin 1.0 - Backup command-line tool
(C) Copyright 2013 Microsoft Corporation. All rights reserved.
The scheduled backup settings:
Bare metal recovery : Not Included
System state backup: Not Included
Volumes in backup: (null)
Components in backup: HyperV\server-1
Files excluded: (null)
Advanced settings: VSS Backup Option (FULL)
Location to store backup: \\network-1\server-1_backup$\
Times of day to run backup: 04:00
But when I run this backup manually, I get the following error:
C:\Users\admin>wbadmin start backup
wbadmin 1.0 - Backup command-line tool
(C) Copyright 2013 Microsoft Corporation. All rights reserved.
Do you want to create a backup using the same configuration that you use for
scheduled backups?
[Y] Yes [N] No y
The backup operation to Scheduled backup target is starting.
Creating a shadow copy of the volumes specified for backup...
Summary of the backup operation:
The backup operation stopped before completing.
The backup operation stopped before completing.
Detailed error: A component critical volume failed to snapshot.
Log of files successfully backed up:
C:\Windows\Logs\WindowsServerBackup\Backup-23-02-2015_08-49-55.log
Log of files for which backup failed:
C:\Windows\Logs\WindowsServerBackup\Backup_Error-23-02-2015_08-49-55.log
ERROR - The shared restore point operation failed with error (0x8100010c)
No valid component or volume to snapshot.
A component critical volume failed to snapshot.
The log file then looks like this:
Writer Failures
Writer Id: {66841CD4-6DED-4F4B-8F17-FD23F8DDC3DE}
Instance Id: {3976D373-854E-4527-B85D-7B61924C8597}
Writer Name: Microsoft Hyper-V VSS Writer
Writer State: 0
Failure Result: 81000112
Application Result: 0
Application Message: (null)
   Component: 1DAF1C56-0635-4043-A933-E97A62EBC139
   Logical Path:
   Component Result: 8100010D
   Component Message: Component reports path on network share which cannot be snapshotted. (0x8100010D)
   Component: 30144C93-56A2-4259-B276-86D59AC767E9
Application backup
Writer Id: {66841CD4-6DED-4F4B-8F17-FD23F8DDC3DE}
   Component: 1DAF1C56-0635-4043-A933-E97A62EBC139
   Caption     : Offline\server-1
   Logical Path:
   Error           : 8078001D
   Error Message   : The operation ended before completion.
The odd thing is that if I set this up from a Windows 2012 Server using the GUI to exactly the same network destination, the backup works no problem. It just doesn't work when using Server 2012 R2 Hyper-V configured through a command line.
Any help appreciated,
Andrew

Hi Andrew,
I tested this in my lab server 2012R2 , but there's no error .
I would suggest you to create a new share folder on other server then check if the issue persists .
Writer Name: Microsoft Hyper-V VSS Writer
Writer State: 0
Failure Result: 81000112
Application Result: 0
Application Message: (null)
   Component: 1DAF1C56-0635-4043-A933-E97A62EBC139
   Logical Path:
   Component Result: 8100010D
   Component Message: Component reports path on network share which cannot be snapshotted. (0x8100010D)"
According to this error , please check if the VM's resource (such as VHD file) was restored on network share .
I also searched the error "ERROR - The shared restore point operation failed with error (0x8100010c)" , but I can not find it within following article :
http://blogs.technet.com/b/filecab/archive/2009/09/16/diagnosing-failures-in-windows-server-backup-part-1-vss-spp-errors.aspx
Any further information please feel free to let us know .
Best Regards,
Elton Ji
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Cisco ASA 8.2. Destination NAT (network - network)

Hi Guys,
Could you tell me if I can do destination NAT (class C network => class C network) on Cisco ASA running 8.2? (or another version).
For example, will destination NAT like this work:
static (inside,outside) 8.2.2.0 10.10.8.0 netmask 255.255.255.0
I need that when a packet from Internet go to 8.2.2.X it's destination IP address will change to 10.10.8.X.
So, if a packet goes to 8.2.2.145 , the dest IP field of the packet will be changed to 10.10.8.145.
If a packet goes to 8.2.2.1, the dest IP field of the packet will be changed to 10.10.8.1.
Etc.
Thanks.

Hello,
Yes, that is possible.. In fact that is the way it works.
Regards,
Julio

Assign management ip address with SCVMM 2012 R2 for hyper-v converged network?

Hi,
I am setting up a converged network for our Hyper-V clusters using vNICs for the different network traffic including management, live migration, cluster-csv, hyper-v etc.
Problem is, how do I assign the hyper-v hosts a management IP address? They need a network connection on the management network for scvmm to manage them in the first place. How do I take the existing management IP address that is directly assigned to the
host and transfer it directly to the new vNIC so scvmm has management of it? Kind of in a chicken and egg situation here. I thought about assigning a temp ip address to the host initially but am worried that assigning the address will cause problems as then
the host would then have 2 default gateways configured. How have others managed this scenario?
Thanks
Microsoft Partner

Rule of thumb: Use one connected network for your Fabric networks (read the whitepaper), and use VLAN based networks for your tenant VMs when you want to associate VM Networks with each VLAN.
-kn
Kristian (Virtualization and some coffee: http://kristiannese.blogspot.com )
We don't have tenants as such due to this being an environment on a private company LAN for sole use of the company virtual machines.
What I have so far:
I created "one connected network" for Hyper-V-Virtual-Machine traffic.
Unchecked "Allow new VM networks created on this logical switch to use network virtualization"
Checked "Create a VM network with the same name to allow vms to access this logical network directly"
This logical network has one site called UK.
Within this site I have defined all of the different VLANS for this site.
Created IP pools for each VLAN subnet range.
I hope I understand this correctly. Started reading the whitepaper from cover to cover now.
Microsoft Partner

Windows 8.1 Enterprise - Hyper-v, Legacy Network Adapter works, but the Network Adapter does not

Folks,
I currently have 2 Virtual Switches: one I set up for WIFI, and the other I set up for
LAN.
Both switches are set up as:
- EXTERNAL
- Allow management operating system to share this network adapter
Both switches I can use with my Legacy Network Adapter.
But the Network Adapter doesn't doesn't work for either.
It did however work at one time, but I think a Windows Update killed it.
Thoughts? Suggestions?
And as always, thank you for reading :)

And here's my HYPER-V log, Running Windows 7 Pro:
(I've applied an 'xxx' info related to my company.)
Windows IP Configuration
   Host Name . . . . . . . . . . . . : broberts-e6420
   Primary Dns Suffix . . . . . . . : xxx.com
   Node Type . . . . . . . . . . . . : Hybrid
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
   DNS Suffix Search List. . . . . . : xxx.com
                                       attlocal.net
Ethernet adapter Local Area Connection 2:
   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix . : attlocal.net
   Description . . . . . . . . . . . : Intel 21140-Based PCI Fast Ethernet Adapter (Emulated)
   Physical Address. . . . . . . . . : 00-15-5D-01-4C-08
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
Ethernet adapter Local Area Connection 1:
   Connection-specific DNS Suffix . : attlocal.net
   Description . . . . . . . . . . . : Microsoft Hyper-V Network Adapter
   Physical Address. . . . . . . . . : 00-15-5D-01-4C-06
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   IPv6 Address. . . . . . . . . . . : 2602:306:3a5e:7050:7426:4a85:cde9:3454(Preferred)
   Temporary IPv6 Address. . . . . . : 2602:306:3a5e:7050:2d15:806e:7f3b:ca31(Preferred)
   Link-local IPv6 Address . . . . . : fe80::7426:4a85:cde9:3454%20(Preferred)
   IPv4 Address. . . . . . . . . . . : 192.168.1.65(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Lease Obtained. . . . . . . . . . : Monday, July 28, 2014 10:18:19 PM
   Lease Expires . . . . . . . . . . : Tuesday, July 29, 2014 10:18:20 PM
   Default Gateway . . . . . . . . . : fe80::769d:dcff:fe77:2379%20
                                       192.168.1.254
   DHCP Server . . . . . . . . . . . : 192.168.1.254
   DNS Servers . . . . . . . . . . . : 192.168.1.254
   NetBIOS over Tcpip. . . . . . . . : Enabled
Tunnel adapter isatap.attlocal.net:
   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix . : attlocal.net
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
Tunnel adapter Local Area Connection* 11:
   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix . :
   Description . . . . . . . . . . . : Microsoft 6to4 Adapter
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
Tunnel adapter Teredo Tunneling Pseudo-Interface:
   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix . :
   Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Hyper-V + DAG Networks

The recommendation for a mailbox server setup within a DAG is that you have two network cards, one for MAPI and other for Replication.
When setting up the guest on a Hypervisor I can't find any recommendations weather the vNICs should be on separate vSwitches?
Is it possible to have both vNICs on the same vSwitch? and just have a VLAN setup on the physical network switches?
Kind Regards
Michael

Hello,
I think this question will be better answered on the Hyper-V forum:
http://social.technet.microsoft.com/Forums/windowsserver/en-us/home?forum=winserverhyperv.
The best practice is that you should isolate the traffic by configuring two separate networks: one for client traffic and one for the replication process. You can do this using
one physical NIC and vlan's or using two NIC's and dedicated vSwitches.
Hope it helps,
Adam
www.codetwo.com
If this post helps resolve your issue, please click the "Mark as Answer" or "Helpful" button at the top of this message. By marking a post as Answered, or Helpful you help others
find the answer faster.

Hyper-V switch network errors

An RDP access from my iPad2 using Microsoft RDP client 8.03 received a black screen with no sign that keystrokes worked. After a bunch of testing (see below) I discovered that when using the PCName for RDP access on the iPad, the Hyper-V NIC was being accessed
but failed to work properly. Using the Host OS NIC IP address RDP worked fine with the Microsoft iPad RDP client.
Error #1: Hyper-V NIC appears to have problems with Microsoft RDP client v 8.03 for IOS
This is not the first Hyper-V Switch NIC problem. A number of times in the past I would have strange networking problems where Internet connectivity would fail or devices on a local network could not be reached. Eventually I began unplugging devices and
removing the Hyper-V USB NIC solved the problem.
Error #2: Hyper-V NIC appears to interfere with Local/Internet access/routing
----------------- Error event log --------------
When using the Microsoft RDP client v 8.03 on my iPad2 for the first time I was disappointed. I connected and attempted a login but the screen went black except for the mouse and keyboard icons and I was unable to gain access to the Windows 8.1 PC.
Event log
* I created a profile with ID, PW and MachineName and was able to connect.
* The initial RDP session returned a wrong password error
* I keyed in the correct password
* The screen went black except for the mouse and keyboard control icons on the top
* I tried ctrl+alt+del, ctrl+alt+end, ESC, and a few other keystrokes but there was no response
* I closed the program and connected back to the RDP host a few times over a 30 minute period and the same problems occurred
* I noticed that the login screen said there were updates that needed to be installed on the PC
* I attempted a login at the physical PC and was denied access with a 'busy with RDP' error
* I went to the PC and ran the Windows updates and rebooted
* Event attempt form the iPad gets the error "Unable to connect to remote PC. Please verify Remote Desktop Is enabled, the remote PC is turned on and available on the network, and then try again"
* I connected without problem to the RDP machine using another Windows 8 PC
* I created a new profile in the Microsoft iPad RDP application using the IP address instead of the PC name and the connection worked.
My Solution:
If a connection using the PCname fails, try using the IP address instead. In my case, the Host OS NIC works fine but the Hyper-V switch NIC fails.
It seems that the cause could be the Hyper-V switch or a local routing issue.
I would appreciate a suggestion on how to test and identify the true cause
Thanks

Hi,
Since you used Microsoft RDP for Ipad ,I suggest you try using Windows RDP client to connect VM to narrow down this issue.
Keep post.
Regards,
Kelvin hsu
TechNet Community Support

Strange behaviour of Hyper-v 2012 network

Hello!
I have been testing Server 2012 hyper-v on a server with 2 gigabit nics, each one connected to gigabit cisco switch.
One nic is "straight" management with ip 10.179.10.30 and second - ip 10.179.10.31 is used for hyper-v machines.
I created external virtual switch on interface 10.179.10.31, deploy virtual machine- everything workrd fine until I checked "Allow management operating system to share this network adapter" on virtyal switch settings.
After that all vms on host become freezing in stopping state, and i cannot restart hyper-v service. But when i disconnect cable from "straignt" interface 10.179.10.30 it again works fine.
I'm very confused of such situation and i need help to understand whats going on. No vlans used in my configuration, vm gets ip address from DHCP from the same subnet 10.179.10.0/24.
I had tested this situation on different servers but always had the same results. Maybe i should configure switch ports somehow?

Brian,
So what should we do for this same subnet situation? I also have this type of situation. I have 2 Hyper-V host with a dedicated NIC for management and for VM production ( VM connecting to the outside world).
The Hyper-V host dedicated NIC has a static IP address ( 192.168.1.11) and the VM production NIC gets an IP address via DHCP ( same subnet through 192.168.1.xxx). Cluster configuration network validation is giving a warning of same subnet.
For the VM production NIC , I created a Virtual Switch so it created a Vethernet , that my VM can use. should I allow management operating system to share this network adapter?
For the Management NIC should I leave it alone or should I create another virtual switch for it (as you say it created a multi homed scenario)?
Please advice.
Joe

Hyper-V Server Network Config

Hello,
I am having issues connecting a newly installed Hyper-v server
I have an IBM blade that I have removed VMware off & installed Hyper-V Server 2012 R2 (Not Windows 2012 R2). The server has 4 1gb nics with 4 Vlans presented down them, they are all trunk ports.
I am unable to find even a couple of posts that make sense (at least in my head).
Is the process, install OS, team cards (if you want to), create virtual switch, but if so where do I put the IP address for the parent partition?
Is it on the team, it can't be on the virtual switch as it is not a nic.
At the moment I am happy with building the system, but configuring the network seems very contradictory on how it can be achieved.
Thanks, Matt

You are correct, when you team the adapters it will create a new adapter using a multiplexor adapter. For a pretty basic setup you would do the steps as follows.
This assumes you have out of band or physical access with the GUI edition installed.
Install operating system like usual drivers and everything. ( I recommend server core for hyper-v, then use your windows 8 client to manage it. Or use powershell.)
In server manager you go to local server, you should see an option in the right hand window that says network teaming. Go into that part and build the team using your physical adapters. Assign IP addresses to the network adapter teams. (skip this if you
are not doing teaming)
Add the hyper-v role.
After it reboots twice you will have the hyper-v manager installed on the start screen. Go into the Hyper-v Manager and build a "new virtual switch" and specify that it's external and choose your team or the adapter you will use. If you uncheck
the "share management" option, that will hide it from the parent OS and doesn't require and IP. If you left share management, that would allow you to utilize that adapter. Typically that is for when you have 1 NIC or a very limited number of networks.
The adapter you specify for the virtual switch will be in trunk mode and will listen for the VLAN's if you have a supported adapter. Which shouldn't be an issue for your server.
As you build machines, you just specify your VLAN tag per virtual machine.

IPv6 Network Flood with Wireless Hyper-V Virtual Network

Recently, on our core switch (also our layer 3 router) we regularly see a high cpu load. This cpu load is the cause of packet loss and bad connections. This is happening for almost two weeks now.
Network inspection shows us that there is a flood of IPv6 Neighbor Advertisements originating from what seems the same IPv6 Address but from different Hardware (MAC) addresses. In each second there are up to a 1500 packets per second advertising
the same IPv6 address. See below for more details about these packets.
Tracing the MAC addresses to their owner learns that all clients are using Windows 8 with Hyper-V and that they have an External Virtual Network bound to their Wireless/WiFi Network Adapter. Removing this virtual network stops sending
those packets. Because multiple hosts are involved it may be necessary to remove this network on all of these hosts.
As is visible in the following packet dump this is an unsolicited neighbor advertisements, resulting in an update in the neighbor table on our IPv6 router. These updates are probably the course of the high cpu load.
Frame: Number = 188594, Captured Frame Length = 86, MediaType = ETHERNET
+ Ethernet: Etype = IPv6,DestinationAddress:[33-33-00-00-00-01],SourceAddress:[00-24-D7-76-C4-68]
- Ipv6: Next Protocol = ICMPv6, Payload Length = 32
+ Versions: IPv6, Internet Protocol, DSCP 0
    PayloadLength: 32 (0x20)
    NextProtocol: ICMPv6, 58(0x3a)
    HopLimit: 255 (0xFF)
    SourceAddress: FE80:0:0:0:6F7:E4FF:FE4A:2267
    DestinationAddress:
FF02:0:0:0:0:0:0:1
- Icmpv6: Neighbor Advertisement, Target = FD00:4953:4E4C:20:6F7:E4FF:FE4A:2267
    MessageType: Neighbor Advertisement, 136(0x88)
    Code: 0 (0x0)
    Checksum: 3593 (0xE09)
- NeighborAdvertisementFlag: 536870912 (0x20000000)
     R:   (0...............................) Not router
     S:   (.0..............................) Not solicited
O:   (..1.............................) Override
     Rsv: (...00000000000000000000000000000)
    TargetAddress:
FD00:4953:4E4C:20:6F7:E4FF:FE4A:2267
- TargetLinkLayerAddress:
     Type: Target Link-Layer Address, 2(0x2)
     Length: 1, in unit of 8 octets
     Address:
00-24-D7-76-C4-68
Because the target address is the same in all packets but the MAC address changes, it seems that there is something on the hosts that is forwarding/proxying these packets (and only those packets) back to the network it came from, but only
after changing the targetlinklayeraddress in the advertisement. This process is described in
RFC4389.
One host with this problem on the network will not resolve in a flood. Only when more hosts with this issue are active the flood occurs. It seems that two or more hosts are required to magnify the packets send by the others.
Hyper-V on Windows 8 makes use of a Network Bridge in software to enable the use of wireless network adapters. Is this the cause of all those packets?
Some of the hosts also had Windows Phone 8 SDK installed. The installation of this SDK enables some networks in Hyper-V. Maybe some configuration change is made enabling the proxying of those packets back to the network they came from?
After removing the SDK the hosts are still transmitting too much packets.
The first occurrence of this flood was on the day after Microsoft’s update Tuesday. Is it possible that one of the updates may be the cause of this? There is one mayor update
KB2770917 which includes updates to DHCPv6 and NDIS library’s. Again, removing this update does not solves the problem.
Updating our switch/router to a higher level of firmware may lessen the impact, this is something I can try. But it shall not solve the problem, the switch is not the source of the packets.
Hopefully somebody recognizes this issue. All ideas are welcome.
Regards,
Martijn

Hello today we have a little breakthrough. Our Accesspoints are connected to a Cisco C2960S Switch. We have enabled storm control on the switches. This blocks only the multicast packets that were flooding the wireless and the wired network.
We determined this using PRTG snmpv2 connection to the Cisco. Whenever the network flooding was occurring the packets per seconds went in the thousands. We now have put the following code on the Gbit interface: (The last line with the storm-control setting
fixed flooding the network at least partially because the multicast packets cannot leave the Accesspoint to travel to other accesspoints or to wired devices.)
Hope this helps others as well.
interface GigabitEthernet1/0/7
description AP06
switchport trunk allowed vlan 1-99,101-4094
switchport mode trunk
speed 1000
duplex full
storm-control multicast level pps 200 50
end

Hyper-V NAT networking

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