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Re: [tcpm] Initial CWND

Michael Welzl <michawe@ifi.uio.no> Sat, 21 March 2015 13:59 UTC

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From: Michael Welzl <michawe@ifi.uio.no>
Date: Sat, 21 Mar 2015 13:59:08 +0000
To: Hagen Paul Pfeifer <hagen@jauu.net>
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Cc: Ingemar Johansson S <ingemar.s.johansson@ericsson.com>, "tcpm@ietf.org" <tcpm@ietf.org>
Subject: Re: [tcpm] Initial CWND
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well this is roughly what i meant when i said "could be automatized"  :)

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> On 21. mars 2015, at 11:44, Hagen Paul Pfeifer <hagen@jauu.net> wrote:
> 
>> On 17 March 2015 at 12:44, Michael Welzl <michawe@ifi.uio.no> wrote:
>> 
>> If you want to repeat the test, this was pretty easy to do. Here's what I did:
>> - get a web page, watch wireshark, find a URL of an object (image or something) that's larger than 10 packets
>> - do the following with help of scapy  ( http://www.secdev.org/projects/scapy/ ):
>>  * send a TCP SYN, respond to the SYN/ACK with a correct ACK
>>  * disable all outgoing ACKs with the firewall
>>  * send a HTTP GET to the address of the large object with scapy
>>  * watch how many packets come back, in wireshark
> 
> This could and should be less complicated if you want to do this on a
> large basis:
> 
> - "Spider" over a list of websites and grab at least a MSS * 10 byte
> object (probably more because some CDN violates IW10 and IW15 and
> more).
> - Capture all data in a pcap file
> - Analyse the file and check for IW, using a python script:
>   - Separate on a per TCP connection basis
>   - Ignore TWH and HTTP GET request, count first burst
> 
> hgn

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