So I've been trying to diagnose this for a while now, and I'm running out of ideas to try. The long and short of things is that I get an IPv6 prefix handed to me, my router correctly passes the information on to my machines, and everything's good for a while. Then a while later (sometimes 5 minutes, sometimes a day) the IPv6 connection falters. No traffic can be passed that way (ping6 says there's no route available). My machines still have correct IPv6 addresses (and IPv4 works all the time).
Renewing the DHCP lease from one of my machines doesn't do anything. Rebooting the machine doesn't do anything. I therefore suspect my modem, my router, or Mediacom.
I have a Cisco DPC3010 modem, and it seems pretty solid. I don't have much reason to suspect it, but I can't rule it out without having another modem to test.
I have a Netgear R7500v2 router. The router seems fine (using the 1.0.2.4 firmware, not the 1.0.3.4 that has known IPv6 issues). But, to be sure, I flashed it with DD-WRT and let it go. It is faster with the open source goodies on there, but the IPv6 problem remains.
I have read posts in other places talking about issues with Mediacom and IPv6 (and, separately, other providers and their IPv6 connections and drops), so I'm strongly led to believe that the problem might lie with Mediacom.
Anyone have any ideas? Right now I've just shut it off (and my connection has been much snappier due to not having to wait for the IPv6 route to time out). Thanks in advance!
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