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** Changed in: qemu
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/761469
Title:
multicast VPN breaks IPv6 Duplicate Address Detection
Status in QEMU:
Incomplete
Status in Fedora:
Won't Fix
Bug description:
The multicast VPN facility in Qemu uses Multicast Loopback to make
sure that other Qemu processes on the Host server receive the
transmission. The side effect of this is that the process sending the
packet also gets the packet back on its receive channel and currently
this is not filtered but passed directly to the Virtual Machine.
You can see this effect by running tcpdump in the virtual machine.
Every packet sent appears to be duplicated.
For IPv4 it doesn't appear to cause much of a problem, however with
IPv6 the duplicate neighbor solicitation packet is precisely what the
system uses to detect duplicate addresses. So IPv6 addresses fail to
establish.
If you run 'ip addr' on a virtual Linux machine with IPv6 enabled you
will see 'dadfailed' next to the link local address. 'ping6' will then
not work.
Checked against 0.12.1.
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