> If a message from A goes via B and C to reach D, is the time it
> passed through B and C important, compared with the time it was sent
> from A ?
Probably not, in my opinion.
> Given that the time of the event is usually what we care about, is
> the receiving time at D important ?
Yes. Don't forget, what's in the packet is not the time the event
occurred (or even the time the packet was built), but rather, what time
A thought it was when the packet was built. If A's clock is wrong,
either accidentally or maliciously, the difference can be significant.
der Mouse
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