>>>>> "teemu" == <[EMAIL PROTECTED]> writes:
teemu> So IP connections are opened many times more often than a
teemu> GSM cellular phone registers to actual cellular network
teemu> infrastructure (depending of course what user actually
teemu> does..). Thus this RTT has to be waited every time such
teemu> activity takes place and not only in powerup and when
teemu> registering to a network.
teemu> I do not know often average cellular phone user would get
teemu> this RTT penalty in real life, but I think that avoiding
teemu> this RTT would be a good design anyhow.
I already said that avoiding unnecessary RTTs is a Good Thing. However
I think you overlooked the point I was making. Presumably at the point
when a phone opens a connection to some web proxy or joins a network
or whatever there will be some sort of authentication and verification
taking place. For instance to assure the operator that the customer is
authorised to use the service. Locating a suitable DNS server could be
part of that authentication dance and the RTT for the "find me a name
server" request would be lost in the noise of the telco infrastructure
deciding what to do about the connection request, who/what to invoice
and log, etc, etc.
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