My first Comcast ISP glitch: my IPv6 address changed for no reason and required manual intervention
Between 21:00 and 21:30 on 2015-08-17 (UTC-7) my primary server lost its public IPv6 address and my monitoring script started nagging me about the problem. The next morning I rebooted both my public facing router and my primary server. Neither action restored my IPv6 address.
After several more hours I decided to power-cycle my NetGear cable modem. I did not power-cycle or do anything else to my public facing router or primary server. Simply power-cycling my cable modem resulted in a new IPv6 address being assigned. The assigned IPv4 address was unchanged.
My IPv6 network prefix changed from 2601:647:4380:d0::/64 to 2601:647:4380:48::/64. I do not care that my IPv6 address changed. I do care that the change did not automatically propagate to my router and downstream hosts and required manual intervention. It is also obnoxious that my IPv6 address changed but my IPv4 address did not change. If this happens more than twice a year I’m going to be extremely unhappy. Despite my ADSL speed problems with AT&T/Sonic.net that caused me to switch to Comcast I never experienced a problem of this nature with those companies.