[Click] Help on feedback of transmitted packets

[Harald Schiöberg]

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aka aka wrote:
> Dear All,
> 
> I am using latest version of click (user level ) with madwifi drivers
> (0.9.4) on wireless nodes running Ubuntu linux (2.6.22-14). I have setup a
> very simple testbed of three wireless nodes which are communicating in
> "adhoc" mode in 802.11b.  On one wireless node, I want to record statistics
> of  transmitted packets: retried, acked, or dropped. After going through
> click and madiwifi documentation (including madwifi stripped) and related
> mailing lists,  I had written several variation of click script files to get
> the feedback about transmitted packets. However,  I have not been
> successful.  I have gone through lot of documentation before posting  the
> question.
> 
> I also wanted to use old madwifi drivers (stripped) as given on the "
> http://pdos.csail.mit.edu/~jbicket/madwifi.stripped/". However, the "README"
> file in the driver directory asks to patch the linux kernel before compiling
> the driver. As i could not find the required patch for the kernel
> (2.6.22-14) i am running, i could not try it, and have been using userlevel
> click.

the stripped driver is not needed anymore, as madwifi "monitor"
virtual-interfaces do the same thing.

set up your device using "wlanconfig ... wlanmode monitor ..."

you also want to run
echo '804' > /proc/sys/net/ath0/dev_type

http://madwifi.org/wiki/UserDocs/MonitorModeInterface
gives an explanation why.

obviously you'll have to build your own "adhoc" mode using
beaconsources/trackers, a rate selector, .....

> 
> Below I am providing a simple click script file which i was using for
> obtaining the desired feedback. On the node where i want to record the
> statistics,  the wireless interface is configured as ath0.
> 
> FromDevice(ath0)
> ->ExtraDecap()
> ->FilterFailures()
> ->Print(0)
> -> tx_filter :: FilterTX()
> tx_filter[1]->PrintTXFeedback(A)->Queue()->Discard;
> tx_filter[0]->PrintTXFeedback(B)->Queue()->Discard;
> 
> When i run this,  although packets at output 0 ( tx_filter[0]) show up,
> however they have all filed 0 as follows.
> 
> "B: 1215120504.951015 FF-FF-FF-FF-FF-FF flags 0 rate 0 max_retries 0
> alt_rate 0 alt_retries 0 retries 0 virt_col 0."
> 
> However, its not showing any packets on the output 1 (tx_filter[1]).
> 
> I must say that i am very new to click/madwifi. I would be very happy to
> provide if any other information is required. I appreciate your help in this
> regard.
> 
> Thanks
> Aka
> _______________________________________________
> click mailing list
> click at amsterdam.lcs.mit.edu
> https://amsterdam.lcs.mit.edu/mailman/listinfo/click


- --
Harald Schiöberg
Technische Universität Berlin | T-Laboratories | FG INET
www: http://www.net.t-labs.tu-berlin.de
Phone: +49-(0)30-8353-58476 | Fax: +49-(0)391 534 783 47
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