Hi Ray,
Thank you for the quick response.
On 2019-02-28 02:31, Ray Satiro wrote:
On 2/27/2019 6:26 PM, Rajvardhan Deshmukh via curl-library wrote:
I am trying to get the HTTP/2 stream id (so use h2c (clear-text)) from
the trace for the experiment that i have run.
The experiment is communication between mptcp capable nodes.
I use the libcurl based client which allows me to downloaded 2 files
(video of 2 second) in parallel
( video segment #1
http://10.10.3.2:9001/www-itec.uni-klu.ac.at/ftp/datasets/DASHDataset2014/BigBuckBunny/2sec/bunny_4219897bps/BigBuckBunny_2s13.m4s
video segment #2
http://10.10.3.2:9001/www-itec.uni-klu.ac.at/ftp/datasets/DASHDataset2014/BigBuckBunny/2sec/bunny_3526922bps/BigBuckBunny_2s13.m4s
)
here is the tcpdump trace
https://umass.box.com/s/2n7st4012vwp8yirddd23pnexho3trxf
Wireshark trace analysis step:
1. Edit > Preferences > Protocols > HTTP2 > HTTP2 TCP port 9001
i see multiple tcp and mptcp packets but, only 12 HTTP/2 packets
(verified that the video segments use 2 different streams)
on one interface and none on the other interface.
I need the HTTP/2 stream number which is only visible in HTTP/2
packets to differentiate if the packet belongs to
video segment #1 or the video segment#2 . With what i have right now,
i can't differentiate if the segment belongs to
video segment #1 or video segment #2.
Let me know if you can direct me to someone who can help.
I don't believe libcurl offers a function to get the stream ID from the
transfer. It's probably possible to manually extract it by using
CURLOPT_DEBUGFUNCTION [1] and then look for CURLINFO_TEXT like this:
* Using Stream ID: 1 (easy handle 0x4c6068)
..and then compare the easy handle I guess.
The rest of what you are asking seems outside the scope of the mailing
list and more a question about Wireshark. I can see the URLs in the
capture in HEADERS:
HyperText Transfer Protocol 2
Stream: HEADERS, Stream ID: 1, Length 100, GET
/www-itec.uni-klu.ac.at/ftp/datasets/DASHDataset2014/BigBuckBunny/2sec/bunny_4219897bps/BigBuckBunny_2s13.m4s
HyperText Transfer Protocol 2
Stream: HEADERS, Stream ID: 3, Length 85, GET
/www-itec.uni-klu.ac.at/ftp/datasets/DASHDataset2014/BigBuckBunny/2sec/bunny_3526922bps/BigBuckBunny_2s13.m4s
There's a lot of MPTCP that's not decoded as HTTP2 by wireshark it
looks
like? I don't know a lot about that... this is the first I'm seeing of
MPTCP. You'd be better off asking in a Wireshark forum.
Thanks, i'll ask the wireshark forum. Might have to figure out a way to
decode MPTCP as HTTP/2.
There's also
GOAWAY PROTOCOL_ERRORs. This looks like some problem that has nothing
to
do with curl like you are testing MPTCP. From what I understand curl
just sees the one TCP connection and behind the scenes it's parsed out
or something. So I don't think there's anything we can do here.
You are correct, curl just sees the one TCP connection and MPTCP handles
the parsing
I will get in touch with the wireshark forum. Thank you for helping me
out.
Raj
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