Posts Tagged ‘IP’

HP ML 370 G6, Network Problem with Hyper-V Guests

June 27, 2009 1 comment

This is a new problem that  faced with HP Proliant ML 370 G6 . After Installing Windows 2008 SP2 and install Hyper-V finish all the configuration everything looks fine.

I start creating some Guest machines with Hyper-V console and joining the domain. We start see unexpected behavior like some missing PING packets and time out for DNS lookup. this looks strange as I tried a lot of HP servers and it worked fine. I made sure that HP Network Configuration is uninstalled but still facing the problem.

 I start suspecting the NIC as I saw problems like this due to NIC , After disabling IPv4 Checksum Offload J It worked fine.

 In most cases I can see that Guest machines are suffering in case of IPv4 Checksum Offload.


While I was searching online I found the same problem there and he recommend to disable all those:

 IPv4 Checksum Offload

TCP Checksum Offload IPv4

UCP Checksum Offload IPv4

TCP Checksum Offload IPv6

UCP Checksum Offload IPv6


Hyper-V Cluster Validation Error… IP Configuration Error

I saw this error before in establishing many failover clusters , In the validation phase of the cluster nodes everything went fine except the IP configurations part.

I made sure that all network drivers are static and the binding is right. But the error keep appearing every time I validate the cluster.

hyper-v-cluster-error network

I found that one of my network drivers has APIPA IP although I haven’t


hyper-v-cluster-error IP Configuration


I run ‘ipconfig /all’ from the command prompt. You might have noticed a few extra interfaces, but not really understand what they are. I suspected that those NICs are the problem so open the server manager to see what I get. I saw that there is many drivers under Network adaptors


Tuesdo Server Manager

There I found driver called Teredo tunneling pseudo-interface

Teredo is an IPv6 transition technology that provides address assignment and host-to-host automatic tunneling for unicast IPv6 traffic when IPv6/IPv4 hosts are located behind one or multiple IPv4 network address translators (NATs). To traverse IPv4 NATs, IPv6 packets are sent as IPv4-based User Datagram Protocol (UDP) messages. For more information check Microsoft network part here




Teredo is enabled by default in Windows Server 2008.



To pass the validation wizard just disable Teredo tunneling pseudo-interface on the cluster nodes


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