Hi there,
Here's a little, rough patch to illustrate the idea we discussed a little at the last Wireless Battle Mesh, that is forwarding the noisy IPv6 Unsolicited Neighbor Advertisements and gratuitous ARP Replies via unicast.
Currently these ugly unsol. NAs cause about 40% of ICMPv6 multicast overhead in our networks here.
A little more detailed explanation with some pictures can be found here:
https://www.open-mesh.org/projects/batman-adv/wiki/Unicasting-unsolicited-ne...
In the few, simple scenarios with bridged-in hosts in VMs, the patch seemed to do what it was supposed to do uppon roaming. Unsol. NAs did only appear on the node the host roamed away from.
If I remember correctly, there were also some worries about how this might work together with BLA-II. I gave it a little more thought and had a look at the BLA-II source code, but couldn't find any issues.
The only BLA-II related non-ideal thing I could think of so far is noted in the code of this patch at the according place (but I think that might not matter much in practice).
Looking forward to hear about what you think about it, especially conceptually.
Cheers, Linus