I've got persistent ipv6 problems with my laptop running kubuntu 15.10 : download speed is very slow, and some transfer just end up totally stalled or timed out (ipv4 runs perfectly fine).It's not a router or hardware problem, as the same laptop with a Live kubuntu 15.10 system runs ipv6 just fine. I've tried to run tests (simple wget on google.com or other websites) outside of X, with as few running processes as possible. I've tried to compare and change /proc/sys/net/ipv6/* values based on those of another kubuntu box. I've tried many different Network Manager connections configurations. No results. I've compared routes and ifconfig values with those of other working boxes, without seeing anything strange.Here is a wireshark capture output from a simple wget -6 portail.free.fr command :Any idea of what could be done to fix this ?
ipv6 connectivity problems
linux;networking;ipv6