[foxboard] Change IP etc from program

[hoorn666]

Hello,

I am using a foxboard with an alternate IP address. I can change it at 
run time from de console or in the net.eth0 at boot time. Now i am 
wondering how to change it from an executable. I tried the following:

char *cmd[]={"ifconfig", "eth0" , "192.168.1.91", (char *)0};
execvp("ifconfig",cmd);

but no succes. I presume if I solved this if also can use route -n to 
add a gateway.

Any suggestions? Many thanks