This AM I discovered native IPv6 connection was lost and the IPv6 connections were connected via 6to4 Tunnel. Checking modem logs (Zoom 5341h) showed a large number of reports of various errors - sync loss, T4, T3, etc., just after midnight today (5/1/14). I also noted that the download frequencies had changed to somewhat lower values, so something was changed, I'm assuming by Comcast. The modem was not rebooted as shown by its up time report ~1,400 hours since last reboot. The modem's software version or config file names haven't changed, either. Now, I have a Netgear WNDR 3700 v1 router, but unlike many other reports of problems with some Netgear routers, I have not had problems retaining native IPv6 connectivity. As shown above my router's IPv6 page shows Comcast has assigned an IPv6 address. Anyway, I rebooted modem, router and followed the usual routine for re-establishing IPv6. Also changed DNS from Comcast's to Google's. No joy as shown by the IPv6 Test site, Comcast Speedtest and Sixornot Firefox Add-on.
Any one else have a problem w/ loss of IPv6 availability overnight? Any suggestions would be appreciated.
As an aside, I have never found a "normal" site that is IPv6 only. The Sixornot developer does have an IPv6 only site which can be used to test whether one can connect to a native IPv6 site and the Comcast Speedtest site will test both IPv4 and IPv6 speeds and pings, but in my usual Internet activity, I have never come across a native IPv6 only site. On the other hand, we've all got to future proof our set ups.
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There is nothing more deceptive than an obvious fact.
Sherlock Holmes in
The Boscombe Valley Mystery
A. C. Doyle
Strand Magazine, October 1891
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