Although it'll be a few years until we will have full IPv6 connectivity, Recent Android Versions are very eager to use IPv6 anywhere they can. This seems to be a major problem in getting a proper peer-to-peer connection going to an IPv4 contact. Rooted devices can use `echo "1" > /proc/sys/net/ipv6/conf/wlan0/disable_ipv6` to temporary disable it. But I am very certain that most of the people do not have IPv6 connectivity and it should become a bigger problem the more people will get it, before it will become less of an issue again.
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