[Qemu-devel] [Bug 495566] Re: qemu network adapter initialization fails when using macaddr=<multicast MAC-address>

[T. Huth]

A check for multicast MAC addresses has been introduced by this commit here:
http://git.qemu.org/?p=qemu.git;a=commitdiff;h=d60b20cf2ae6644b051
So I think we can close this ticket now.

** Changed in: qemu
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/495566

Title:
  qemu network adapter initialization fails when using
  macaddr=<multicast MAC-address>

Status in QEMU:
  Fix Released

Bug description:
  Not sure if ultra-strange, nondocumented feature in qemu (or linux
  kernel) or really bug: Network card initialization fails if first byte
  of mac address  is not 00. The problem occurs at least with
  model=pcnet/rtl8139, in both cases the network adapter is not usable.

  How to reproduce:

  * Take standard  initrd/kernel (tested with hardy)

  * Start qemu (cmd see below) and enter "modprobe pcnet32" at prompt:
  qemu -name SetupTest -no-acpi -m 128 -drive file=/dev/null,if=ide,index=0 
-net nic,macaddr=00:22:33:44:55:66,model=pcnet -net user -kernel 
vmlinuz-2.6.24-26-generic -initrd initrd.img-2.6.24-26-generic -append 
break=premount

  You will see "pcnet32 ... at 0x..., 00:22:33:44:55:66

  * Do same with mac address 11:22:33:44:55:66
  qemu -name SetupTest -no-acpi -m 128 -drive file=/dev/null,if=ide,index=0 
-net nic,macaddr=11:22:33:44:55:66,model=pcnet -net user -kernel 
vmlinuz-2.6.24-26-generic -initrd initrd.img-2.6.24-26-generic -append 
break=premount

  You will see "pcnet32 ... at 0x..., 00:00:00:00:00:00

  The network adapter is non-functional, "ip link set eth0 up" does not
  report error, but does not work (indicates at least some linux kernel
  influence)

  With the rtl8139 adapter, mac-address in guest is correct, but adapter
  does not work either (indicates qemu influence)

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