Message-Id: <200211151209.gAFC9aJg021167@thoth.ir.bbn.com> From: Mark Allman <mallman@grc.nasa.gov> Subject: Re: Does tcptrace measure RTT for every ACK? Date: Fri, 15 Nov 2002 07:09:36 -0500
> If I'm right RTT meassured values differ their meaning _a lot_ depeding
> where the monitorization host is
>
>
> Am I right?
Yes. Vantage point matters a ton in all sorts of metrics -- and RTT
is one of those, you you have outlined.
I think the bottom line is that when you are measuring for some
specific purpose your vantage point should be carefully chosen. If,
for instance, you are trying to assess packet reordering in the
network a sender-side trace does you little good.
On the other hand, if you're investigating TCP sender behavior a
sender side trace is going to provide a picture that is quite close
to what the actual stack sees/does.
It's all a tradeoff and it all depends on your goals.
allman
-- Mark Allman -- BBN/NASA GRC -- http://roland.grc.nasa.gov/~mallman/ ---------------------------------------------------------------------------- To unsubscribe, send a message with body containing "unsubscribe tcptrace" to majordomo@tcptrace.org.
This archive was generated by hypermail 2b30 : 11/15/02 EST