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.
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