Why sudo isn't acceptable?

I need to create a network bridge with 'brctl addbr br-lan' command in a sh script without using sudo. I have a script like; brctl addbr br-lan ifconfig lo up I have tried to set capabilities to my script with sudo ./setcap cap_net_raw,cap_net_admin,cap_dac_override+eip ./myscript.sh But it didn't change anything. To call './myscript.sh' returns the following output; add bridge failed: Operation not permitted SIOCSIFFLAGS: Operation not permitted What should I do to run my script without root rights or which capabilities should I define to my script? Tx.