On Fri, 22 Jun 2007, Ian O'Connell wrote:
> its possible to do udp pings with the right software on either end or
> client side software to a standard service. latency is pretty much an
> abstract concept in packet switched networks but the only established
> way that i'm aware of to measure it would be a ping client of some
> sort no?
TCP measures RTT, to use as input to its congestion control.
The point is that the latency TCP measures may well differ
significantly from latency measured by other protocols, e.g.
diagnostic ICMP messages.
The mistake essentially is that there's no such single thing as
'network' latency..
You are correct in thinking that there's a "floor" boundary, which
all protocols would be within, which you may be able to have a good
guess at with diagnostic tools - but maybe not.
> (i'm not trying to be arguementative, i'm rather curious about this)
regards,
--
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