We had IPv6 connectivity last week, but our IPv6 prefix changed over the weekend, and now no hosts can connect to any external host (e.g. ipv6.whatismyv6.com). Any idea what happened?
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I first thought it was the router, but then I tried several computers (Windows, MacOS, Linux) that were connected directly to the modem and had the same problem.
No, I haven't tried a modem reboot. I'll try that next.