I've been trying to embrace IPv6 as much as possible in my home setup. Something funny I noticed, though, is that ICMP ping times are 30ms higher over IPv6 vs. IPv4 between the same two hosts when the packets go over a wireless WDS link. I have yet to explain it.
I'm talking about my own traffic inside my LAN, though. It's all switched or bridged at layer 2, without any layer 3 routing. I get 30ms vs. 2ms ping times, where the only difference is the IP version.
My current theory is that the WDS link devices' wifi firmware or drivers are doing some sort of packet content based QoS. They see the IPv4 ICMP ping request go by and optimize for return latency. The IPv6 ICMP ping request, on the other hand, doesn't. It's like diesel emissions cheating by having the car detect it's on a dyno...
