Promiscious mode wifi capture on iMac with Atheros 5416

Sound a old hardware, but as it is not the first time I have issue to dump (tcpdump or wireshark) wifi connection on promiscuous mode, I prefer to write it once of all … It is not working !!!

If any of you have a solution to make it works, I’ll be happy to update this post. For the others, I expect you will loss less time searching and trying.

I’ve try to change the rights on the /dev/bfp* devices

I’ve try to use tcpdump -i en1 host xx.xx.xx.xx instead of wireshark

And at the end, I finally just got the broadcast traffic and the local traffic.

 

HowTo synchronize two Linux server using rsync over ssh

When your need to replicate data from one server to another, the rsync solution is usefull. It works over ssh and you do not really have any specific thing to configure. Here are the options to be used to get a full copy with all the rights and ownership replicated :

 rsync -P -azc src_files_or_dir user@dest_server_ip:/dest_server_dir/

This works if the destination server have ssh open on port 22. If it is not the case another set of options is required :

rsync -P -azc -e "ssh -p dest_port" src_files_or_dir user@dest_server_ip:/dest_server_dir/

Hope it’ll help ! fro sure it will be a good reminder for me 😉

 

Use Boinc with opensuse 12.2

I had some trouble to install boinc application on OpenSuse 12.2 due to wxWidget configuration…

The right way tomake it work is to :

– Install wxWidgets-wxcontainer-compat-lib-config

– Install the libwx_xxxx_xxx-2_8-0-wxcontainer required (use ldd boincmgr to get the list)

– Create a symbolic link on libnotify.so.4 to libnotify.so.1 in /usr/lib64

After doing this, it worked for mand the following message has disapeared : symbol _ZTV16wxWindowListNode, version WXU_2.8 not defined in file libwx_gtk2u_core-2.8.so.0 with link time reference

 

Customizing PirateBox configuration

After installing the piratebox, it’s nice to customize it a little bit… There are many reason for this, the first one, in my point of view is to have a more understandable SSID name depend on your country… Here are the list of the step of the customizations I made on myne.

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TP-Link MR3040, autonomy test

As promise, I’m looking for MR-3040 information about autonomy. This device is really interesting as it provides an internal battery to power the device on. The question was, how many time can we use it, is the autonomy good enough to have a real mobile device you don’t have to care about autonomy when bring out to public !

The first thing is to reload the battery, from 0 to 100% it takes 3:10 using the given equipment.  The next thing is to empty the battery by just doing nothing else than switch it on, as a result, the MR-3040 ran during 7hours. This is a really good result as it means that we can bring it out most of one day (or night).

The last step is to empty the battery transferring file from & to to mr3040, in this scenario, the battery autonomy should be smaller but the result is an autonomy of 5 full hours with a transfer rate about 1.5MB/s. I was expecting a shorter time so it is a good news.

The main issue I can raised after this test is the coverage area of these kind of devices (MR3040 or MR3020) really limited to a some meters and really blocked by rock walls. This is limiting the share with the neighborhood capability. It makes it more recommended to have a share into a room.

Installation of a piratebox on T-Link MR3040

I just received the TL-MR3040 wifi portable access by T-link. This little box is really like the mr3020 i had for my piratebox with the main advantage of having and internal battery making the piratebox mobile for a small price ! For actually 38€ (but you may found it at lower price) it is an interesting and compact solution to bring you piratebox out.

I’ll try in the next part of this article to detail the installation process as friendly as possible. Never forget that this kind of operations are not always easy and may damage your device. Do it at your own risk.

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Nmon cpu_summ vs cpu_all in a SMT environment

In a SMT CPU you have real primary core and SMT core, all can have process allocated to them but the performance of the primary logical processor compared to the SMT one are not equivalent. Usually the SMT power is about 20-30% of the primary one.

This impact the way the performance is measured

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