Re: Testing LFNs

[David Andersen]

set your system send and receive TCP buffers larger. You're probably being limited by that. With linux, make sure you have window auto- scaling enabled and have increased the maximum size it can grow to to at least 4MB.

IOS includes a 'ttcp' command you can use on the router itself:

http://www.cisco.com/en/US/tech/tk801/tk36/technologies_tech_note09186a0080094694.shtml

  -Dave

On May 6, 2009, at 11:10 AM, Kaegler, Mike wrote:

Or test with UDP and blast as fast as you can so that you're not seeing TCP weirdness.

I have a new T3 thats 65msec long. I'd usually be using iperf to test new

links, but at 65msec, even at the maximum window size, I can only get



there a real chance 44 will not?

TIA,
-mKaegler


--
Michael Kaegler, TESSCO Technologies: Engineering, 410 229 1295
Your wireless success, nothing less. http://www.tessco.com/

6-8mbit through. No combination of options I've been able to find has gotten me more than 6mbit through this link. Should I just shotgun 9 copies of it? Are there better ways to test these links? Can one verify this link with just a pair of 7200s and linux machines on either side? Or is this something one really needs "real" test hardware for? If 6mbit go through clean, is

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