On Sat, Nov 30, 2019 at 03:59:54PM +0000, Richard M wrote: > Hello > I found under networking in the Domain XML 'Multcast tunnel'. > My question is does anyone know what is the intended use of multicast > tunnel networking?What are the potential pitfalls of using such a > configuration other than what's highlighted in the domain xml. eg: > can it suffer from throughput issues? Can the tunnel be accessed from > outside Libvirt? > I'm struggling to find any information about it. If anyone has any > information about it, Or where I can obtain such information it would > be appreciated.
This is something that has been supported by QEMU forever, but I think it is fair to say it is rarely used. The main use case would be setting up network communication between a group in QEMU instances (possibly across hosts) in a case where you don't have access to any better technology such as tap device + bridging. eg if you are an unprivileged user & cannot get root. I doubt performance is going to be anything special. There's also no meaningful security - any user or process or host can send & receive on the same multicast address. Regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :| _______________________________________________ libvirt-users mailing list libvirt-users@redhat.com https://www.redhat.com/mailman/listinfo/libvirt-users
