I run NTP v3 on AT&T 50/4 business DSL (using a Pace plc 5268AC), but I'm moving to Internet business 100 on fiber. I notice in other places in the Forum that port 123/udp outbound is supposedly blocked. If that's the case, then AT&T should have NTP servers inside that port block, so that your customers can sync up with time. (After all, the AT&T phone network is littered with highly accurate caesium clocks, so setting up stratum one servers should be a no-brainer, as well as a number of stratum two servers to prevent overloading the stratum one time servers that would be just fine for most business and residential computers.) To prevent DDoS, the servers could have rate limiting so that attempts to use them for DDoS would fail.
What are the fully qualified domain names of those customer-reachable servers?
I didn't find the right solution from the Internet.
https://forums.att.com/t5/AT-T-Fiber-Eq ... 3970#M4149
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