To provide some details about the setup and to clarify some points. We are creating an emulated testbed for TDMA experiments, where several machines connected over the same VLAN follow a TDMA schedule. We have a second control network that is lightly loaded and does not see any experimental traffic. For us, it is critical to ensure that all the nodes participating in the TDMA schedule have pretty much the same time with a small offset (ideally under 100 micro-seconds). For the expriment, it is not important if the local time is anywhere close to true global time, hence we don't synch with stratum 1 ntp server (we have a flaky Internet connection). Additionally, we are not concenred with drift or clock skew that happens over periods of longer than a few hours. Ideally, we would have a GPS PPS pulse driving ntp on the ntp server; however, we don't have one yet and have to use the clock of the machine. It was my impression of reading the documents that frequent polling of a ntp server on the same fast LAN will minimize time offsets, as that is our primary concern. I also would not call myself a non-beliver of ntp algorithms. I am just trying to configure ntp to best fit our needs, which are quite different from the usual situation.
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