Re: [tcpm] Initial CWND
Hagen Paul Pfeifer <hagen@jauu.net> Sat, 21 March 2015 11:44 UTC
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Date: Sat, 21 Mar 2015 12:44:49 +0100
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From: Hagen Paul Pfeifer <hagen@jauu.net>
To: Michael Welzl <michawe@ifi.uio.no>
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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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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
- [tcpm] Initial CWND Ingemar Johansson S
- Re: [tcpm] Initial CWND Michael Welzl
- Re: [tcpm] Initial CWND Matthew Luckie
- Re: [tcpm] Initial CWND Scheffenegger, Richard
- Re: [tcpm] Initial CWND Ingemar Johansson S
- Re: [tcpm] Initial CWND Michael Welzl
- Re: [tcpm] Initial CWND Hagen Paul Pfeifer