Re: OPNET - End user experience - Analyzing TCP packets

TCP timestamping is another option (RFC 1323).

It basically is on OS agnostic relative timestamp that allows for you to
see when the OS stack actually sent the packet on each side. It allows for
yet another determinate of latency measurement at each end.

Cool thing is.. its the OS time stamping vs the network timestamp.its a
clue to how each host is performing at each end.
On Jul 31, 2013 10:08 AM, "Thomas Perrier" <thomas_at_perrier.name> wrote:

> On Wed, Jul 31, 2013 at 1:21 PM, Carlos G Mendioroz <tron_at_huapi.ba.ar>
> wrote:
> > It could do differencial tests between icmp and tcp processing.
> > Pings are usually answered with very little/no cpu involvement, and
> > would give a baseline to compare to.
>
> The probe could also measure the TCP establishment time
> (SYN/SYN-ACK/ACK), which would give a baseline for TCP processing time
> + network latency.
>
> -Thomas
>
>
> >>> On Wed, Jul 31, 2013 at 3:06 AM, Sirhan Khan <khan.sirhan_at_gmail.com
> >wrote:
> >>>
> >>>> Hi Guys
> >>>>
> >>>> Just a quick question, I just left a meeting now and have been
> monitoring
> >>>> packets on wireshark for some time but don't see how this is possible.
> >>>>
> >>>> Topology:
> >>>>
> >>>> USER -- LAN -- WAN -- OPNET PROBE -- PE -- DATA CENTRE
> >>>>
> >>>> Looking at the position of the OPNET probe, can the opnet device look
> at
> >>>> the processing time of the USER machine ( how long the client
> machine's
> >>>> processor takes to process the tcp packet ).
> >>>>
> >>>> According to OPNET, this is possible by looking at certain variables
> on
> >>>> the
> >>>> packet header. Is this possible?
> >>>>
> >>>> Regards
> >>>> Sirhan
> >>>>
> >>>>
> >>>> Blogs and organic groups at http://www.ccie.net
> >>>>
> >>>>
> _______________________________________________________________________
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> >>
> >>
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> >>
> >>
> >>
> >>
> >>
> >>
> >
> > --
> > Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
> > _______________________________________________________________________
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>
>
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>
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Received on Fri Aug 02 2013 - 09:36:04 ART