add mailinglist scraper results

1 files changed, 32 insertions, 0 deletions

diff --git a/mailinglist/output_launchpad/495566 b/mailinglist/output_launchpad/495566
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+qemu network adapter initialization fails when using macaddr=<multicast MAC-address>
+
+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)
+
+Tested other mac addrs, seems that the first byte has to be even. Would it make sense to issue a warning if a user requests a mac address with an odd first byte? What is the special meaning of the bit 0?
+
+That bit indicates whether the address is a multicast or unicast address.  A network card cannot have a multicast address.
+
+It would make sense to do sanity checking for this.
+
+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.
+