Tools to measure TCP connection speed

Mon Mar 10 16:41:27 UTC 2008

A couple of tools I use from time to time are iperf and ttcp. I'll run  
iperf on some host and either run ttcp to it from a router or iperf to  
another host. You can also run ttcp router to router.

-wil

On Mar 10, 2008, at 8:51 AM, Joe Shen wrote:

> we do not just want to analyze e2e performance, but to
> monitor network performance at IP and TCP layer.
>
> We monitor end-to-end ping with smokeping, but as you
> know, ICMP data does not reflect application layer
> permance at any time. So, we set up two hosts to
> measure TCP permance.
>
> Is there tools like smokeping to monitoring e2e TCP
> connecting speed?
>
> Joe
>
>
>
>
> --- "Darden, Patrick S." <darden at armc.org> wrote:
>
>>
>>
>> Best way to do it is right after the SYN just count
>> "one one thousand, two one thousand" until you get
>> the ACK.  This works best for RFC 1149 traffic, but
>> is applicable for certain others as well.
>>
>> I don't know of any automated tool, per se.  You
>> really couldn't do it *well* on the software side.
>> I see a few options:
>>
>> 1.  this invalidates itself, but it is easily
>> doable: get one of those ethernet cards that
>> includes all stack processing, and write a simple
>> driver that includes a timing mechanism and a
>> logger.  It invalidates itself because your
>> real-life connection speeds would depend on the
>> actual card you usually use, the OS, etc. ad
>> nauseum, and you would be bypassing all of those.
>>
>> 2.  if you are using a "free" as in open source OS,
>> specifically as in Linux or FreeBSD, then you could
>> write a simple kernel module that could do it.  It
>> would still be wrong--but depending on your skill it
>> wouldn't be too wrong.
>>
>> 3.  this might actually work for you.  Check to see
>> how many total TCP connections your OS can handle,
>> make sure your TCP timeout is set to the default 15
>> minutes, then set up a simple perl script that
>> simply starts a timer, opens sockets as fast as it
>> can, and when it reaches the total the OS can handle
>> it lets you know the time passed.  Take that and
>> divide by total number of connections and you get
>> the average....  It won't be very accurate, but it
>> will give you some kind of idea.
>>
>> Please forgive the humor....
>>
>> --Patrick Darden
>>
>>
>>
>> -----Original Message-----
>> From: owner-nanog at merit.edu
>> [mailto:owner-nanog at merit.edu]On Behalf Of
>> Joe Shen
>> Sent: Monday, March 10, 2008 5:00 AM
>> To: NANGO
>> Subject: Tools to measure TCP connection speed
>>
>>
>>
>> hi,
>>
>>  is there any tool could measue e2e TCP connection
>> speed?
>>
>>
>>  e.g. we want to measue the delay between the TCP
>> SYN
>> and receiving SYN ACK packet.
>>
>>
>> Joe
>>
>>
>>
>>
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