x64 Win 2008 SP2: Only Legacy NIC works

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have hp pro liant ml 370 hyper-v host hp nc375i integrated quad port multifunction gigabit server adapter, running on x64 windows server 2008 sp2 core installation, enterprise edition.

have created new virtual machine , installed x64 windows server 2008 standard integrated sp2 (volume licence, msdn download dvd). installation worked fine, virtual machine gets ip address, ip v4  connectivity limited: can ping vm , hyper-v host vm running on, no other machines.
- have reinstalled integration services, same problem.
- have created new vm windows xp sp3. machine has no connectivity problems @ standard hyper-v nic.
- have removed network adapter w2008 vm, added "legacy network adapter", , connectivity problem solved!
- have removed "legacy network adapter", added standard network adapter. after starting w2008 vm, machined detected "microsoft virtuakl machine bus network adapter #2", , connectivity problem here again!
- have verified eventlogs of hyper-v host , of windows 2008 server guest. there absolutely no hints why guest has no connectivity.

my questions:
- has idea why legacy network adapter working on x64 windows 2008 server sp2 vm?
- before posting this, googeled , found problems can arise when "tcp offloading" features enabled on hyper-v host. has hint how disable tcp offloading on hyper-v host running on server core?

thank in advance help.
franz

thank help, assumptions right, it's nic issue. have installed 2 year old hp nic (hp nc 360t) , removed nic preinstalled , delivered brand new ml370 g6 system (hp nc375i integrated quad port multifunction gigabit server adapter) , hyper-v guests run fine standard network adapter, offloading options enabled.

franz


Windows Server  >  Hyper-V



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