Server 2008 x64 & VS = Media Disconnected

S

Steve W.

I browsed the questions and did not find a solution to my problems. I am
currently running a HP Proliant G5 with 2 gigabit 4port network cards. I have
3 virtual machines connected to 3 routers with com port connections and
ethernet connections (crossover cables). A single log on for all 3 machines
in vmrc. Now when I log into the machines (I have mapped the correct ethernet
ports and com ports to the proper routers and vms) I can connect to the
routers fine through the console port but have a media disconnected error. I
have 2 2003 servers with the exact same setup (virtual machines and routers)
running perfectly fine. When I map a network to the machine shutdown and
reboot the machine it checks out fine and then when I re-enable the correct
network interface they work fine until the server restarts (every night).
Also reinstalling the network card drivers corrects this issue until restart.

My question is this, is there a bug in 2008 x64 that is showing media
disconnected? My adapters on the host machine work perfectly fine if I map
ip's within range of the routers fa0/0 and ping, but they show up media
disconnected in the virtual machine.

This also apparently is happening on virtual networks also. I have 3 virtual
machines on 1 private network (in virtual server) and they are also getting
the media disconnected issue, creating a new virtual network fixes the issue
until reboot.
 

My Computer

C

Charlie Russel - MVP

Server 2008 has a completely new TCP/IP stack, and there are definitely some
issues with older NIC drivers. I would first start by downloading the very
latest drivers for the NICs. If that doesn't help, you can disable some of
the advanced features of the NICs, including Task Offload (TOE), TCP
Chimney, Receive Side Scaling (RSS) and TCPA.

Open Regedit, and navigate to
HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
Set the following DWORD values to 0:
EnableRSS
EnableTCPA
TCPChimney
Set the following DWORD value to 1:
DisableTaskOffload

If these values don't exist, create them. Now, shutdown and power off the
server. Wait 10 secs. Restart.


--
Charlie.
http://msmvps.com/blogs/russel




"Steve W." <[email protected]> wrote in message
news:[email protected]

>I browsed the questions and did not find a solution to my problems. I am
> currently running a HP Proliant G5 with 2 gigabit 4port network cards. I
> have
> 3 virtual machines connected to 3 routers with com port connections and
> ethernet connections (crossover cables). A single log on for all 3
> machines
> in vmrc. Now when I log into the machines (I have mapped the correct
> ethernet
> ports and com ports to the proper routers and vms) I can connect to the
> routers fine through the console port but have a media disconnected error.
> I
> have 2 2003 servers with the exact same setup (virtual machines and
> routers)
> running perfectly fine. When I map a network to the machine shutdown and
> reboot the machine it checks out fine and then when I re-enable the
> correct
> network interface they work fine until the server restarts (every night).
> Also reinstalling the network card drivers corrects this issue until
> restart.
>
> My question is this, is there a bug in 2008 x64 that is showing media
> disconnected? My adapters on the host machine work perfectly fine if I map
> ip's within range of the routers fa0/0 and ping, but they show up media
> disconnected in the virtual machine.
>
> This also apparently is happening on virtual networks also. I have 3
> virtual
> machines on 1 private network (in virtual server) and they are also
> getting
> the media disconnected issue, creating a new virtual network fixes the
> issue
> until reboot.
 

My Computer

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