I have had IPv6 turned on with my ASUS router for a while (using the IPv6 6rd settings from CL). Recently, I've felt that something was not right with my network. Some web pages would take a long time to start loading and often, I would have to reload the page to get it to load at all. During a wireshark trace, I saw lots of TCP packets that had to be retransmitted.
However, I noticed that some devices on my network (my IP phone and my Roku box) didn't seem to have any problems. These devices are not IPv6 compatible, so I tried turning off IPv6 and all of my problems went away.
What would cause such poor performance with IPv6?
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