execution of system-programs

[Anon]

hi,

i have the following problem:
i want to manage an redhat-7.0-linux-system via webinterface.
i started with showing the network-interfaces.
now i want to be able to enable/disable a network-interface ("ifconfig <interface> <up|down>") from the webinterface.

so i tried the following commands:

exec("ifconfig lo down");
shell_exec("ifconfig lo down");
´ifconfig lo down`;
system("ifconfig lo down");

but nothing happend.
i tried other commands like "ls -al" instead of "ifconfig lo down" and i got the output.

does anybody know the reason for this strange behavior?

thanks,
ingo

[Anon]

due to some time of experimenting, i finally found the mistake on my own:
the user httpd doesn't have the right to executed "ifconfig lo down"
just use "sudo ifconfig lo down" correct configured...