[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Bug 761469] Re: multicast VPN breaks IPv6 Duplicate Address Detection
From: |
Thomas Huth |
Subject: |
[Bug 761469] Re: multicast VPN breaks IPv6 Duplicate Address Detection |
Date: |
Wed, 26 May 2021 15:49:14 -0000 |
Since there hasn't been a reply within the last months, I'm closing this
now.
** Changed in: qemu
Status: Incomplete => Won't Fix
--
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/761469
Title:
multicast VPN breaks IPv6 Duplicate Address Detection
Status in QEMU:
Won't Fix
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.
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/761469/+subscriptions
[Prev in Thread] |
Current Thread |
[Next in Thread] |
- [Bug 761469] Re: multicast VPN breaks IPv6 Duplicate Address Detection,
Thomas Huth <=