I was being a bit extreme, I don't expect UDP to be blocked and there are valid uses for NTP and it needs to pass. Can you imagine the trading servers not having access to NTP?
Sure. They could setup internal NTP servers listening to GPS. Would it be as good overall as using external servers? Probably not, but it might be good enough. I doubt if it would be very high on any trading floors list of nasty problems. They could arrange to poke holes through the generic UDP block - whitelist the few known cases where UDP traffic is expected. Would it be a pain to administer? Probably, but I'll bet it could be made to work. -- These are my opinions. I hate spam.
On 2/14/14, 3:00 PM, Hal Murray wrote:
I was being a bit extreme, I don't expect UDP to be blocked and there are valid uses for NTP and it needs to pass. Can you imagine the trading servers not having access to NTP?
Sure.
They could setup internal NTP servers listening to GPS. Would it be as good overall as using external servers? Probably not, but it might be good enough. I doubt if it would be very high on any trading floors list of nasty problems.
They could arrange to poke holes through the generic UDP block - whitelist the few known cases where UDP traffic is expected. Would it be a pain to administer? Probably, but I'll bet it could be made to work.
High value concentrated applications are relatively easy things to get high quality time to. it's all the consumer electronics devices and everything that uses ssl/tls that needs access to time that is a more diffuse and less tractable problem. joel
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Hal Murray -
joel jaeggli