Category: Linux Tech

Often it is necessary for testing purposes to recreate the networking conditions found in a high latency network, such as a satellite link.
Firstly create a network bridge that can be placed in-between the test network and its router (assuming eth0 and eth1 are the bridged interfaces).
To increase network latency use the following command: …

When developing on platforms with a different architecture and cross-compiling, it is often necessary to print the stack trace on a coredump.

TOOLCHAIN=/path/to/toolchain
DEBUGER=$TOOLCHAIN/gdb
EXECUTABLE=myprogram…

The scenario is that your Enlightenment (e17) desktop has locked up, and your keyboard and mouse appear to be non-responsive. However you do not want to reboot as you will lose all of your open windows. It is possible to restart the Enlightenment engine without affecting the windows being currently displayed. Either switch to a

Often for testing purposes it is necessary to restrict the speed of a network connection. This can be achieved using the netem module to tc.

For example, to restrict the bandwidth on eth0 to classic dial-up speeds use the command:
tc qdisc add dev eth0 root netem rate 56kbit

The compose key may be used to type unicode characters easily on Linux systems… All of these commands should be executed as a normal user, no root access required.Restart X and you will be able to use unicode: <Compose key> + " + u = ü<Compose key> + ' + e = é<Compose key> +

When debugging bash scripts use:
set -o xtrace
to print out each line along with the regular output, as it is executed.

Using Debian with a Intel Corporation Centrino Wireless-N 1000 card… 7. After collecting 30,000 packets (you may leave airodump-ng running): aircrack-ng -1 capturefile.cap 8. The WEP key should then be displayed in the terminal window.9. The collected packet trace may be decrypted with: airdecap-ng -w $wep_key_hex capturefile.cap 10. Exit monitor mode: airmon-ng stop mon0

This is easier and more effective than packet sniffing on a wired network: