[libvirt] macvtap - no incoming ipv6 traffic processed on kvm host unless i start tcpdump on interface

Stefan Bauer sb at plzk.de
Wed Apr 8 12:49:10 UTC 2015

On Wed, 2015-04-08 at 14:32 +0200, Martin Kletzander wrote:

> I'm guessing the promiscuous modes plays its part in this field.  You
> can try setting the interface to promisc mode manually using 'ip l set
> $dev promisc on' and see whether that helps without starting tcpdump.
> Also check sysctl -a | grep 'ipv6.*forward'.

Thank you for your answer. IIRC forwarding is only required for routing.
I use bridge mode.
You are right - it's working with promiscious mode enabled. 

2a01:198:200:8350:98ec:1708:c82e:a4fb dev br-lan  INCOMPLETE

2a01:198:200:8350:98ec:1708:c82e:a4fb dev br-lan lladdr
52:54:00:8e:b9:eb REACHABLE

Is it really required to be enabled all the time to make it work?



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