I have two SixXS tunnels, T6437 and T126970. Since a month or so, T126970 is showing around 40% Latency Loss here on the SixXS status page. A screenshot I took a little few weeks ago: http://tweakers.net/ext/f/QzJksjaP4RN5tVrObcnAN3oL/full.png The other tunnel is showing completely healthy. Both are static 6in4 Both use the same PoP: nlams05 Both are on the same ISP, Ziggo, but in different towns Both are terminated on Asus RT-AC66U routers running Merlin firmware with similar settings T6437 is terminated on a router behind a bridged Ubee docsis modem T126970 is terminated on a router in the DMZ of a Ubee docsis modemrouter No changes have been made on my side around the time the loss started. Unless my ISP changed something that affects only 1 of my two tunnels. In practice both tunnels are working fine. Connectivity is fast and bandwidth also seems fine. Running ping commands to the PoP IPv4 or to IPv6 hosts on the internet show no loss and ~10ms response times. Nevertheless, I am curious what could be causing this latency loss and whether I could (and should?) do something about it? The only thing I tried a week ago is tinkering with the MTU settings of T126970. This used to be on the default 1280. I increased it to 1480, tunnel is still working fine, but no change to the latency loss reported by SixXS.