Day of Defeat Source

Day of Defeat Source cheat codes: 
Enter one of the following console codes to
activate the corresponding cheat function:

lightgamma       - Change brightness
fps_max [number] - Change framerate
stopsound        - Disable background sound

Crosshair Change:
To make it so your crosshair won't get bigger when you move.
type [~] to go into console, hit spacebar once and type cl_dynamic_xhair 0

Display ping values:
Start the game server with the -numericping command line parameter.

Turn Off Background Sounds:
To turn off background sounds so you can hear footsteps and real fire
better type stopsound in the console.