qemu nic missing after F13 upgrade

[Bill Davidsen]

Dr. Michael J. Chudobiak wrote:
> Hi all,
> 
> after my upgrade to F13, everything is working fine except that the 
> instance of WindowsXP that I run under qemu can no longer see any 
> network card. It does not appear in the Windows network control panel.
> 
> If I run "ps ax | grep qemu", I see:

> How do I even debug this?
> 
> - Mike

https://bugzilla.redhat.com/show_bug.cgi?id=581177

I found that if you omit "-net nic" it will work to the extent that you get an 
IP in the 10.x.x.x range with external connectivity, while if you have a bridge 
set up adding "-net tap" seems to work, passing the MAC address to whatever 
external DHCP you use. I set the MAC and my DHCP server assigns the right IP so 
that I can use servers in a VM, and all works.

The problem seems to be that if you use "-net nic" (from an old script, perhaps) 
it doesn't get a DHCP response. The bug report is old, I did verify that 
previous qemu-kvm did work with "-net nic" on the command line, but that seems 
changed.

Other than having to decide if a VM was to be a client using host IP or server 
using the tap, it all seems to work.

-- 
Bill Davidsen <davidsen at tmr.com>
   "We have more to fear from the bungling of the incompetent than from
the machinations of the wicked."  - from Slashdot