IP Spoofing

Been trying to change the TCP Header Source IP-Address field in my packets for couple days now. But it seems to be quite hard. I need to do a HTTP Request with Spoofed Source IP-Address. If possible could it be done for Curl?

>>13
Actually, sane providers won't give a shit what address you send
your packets out with because it's not their job and they'd
rather use the processing power of their routers for actually
useful things instead of unnecessary filtering.
Yeah, right, let's not give a fuck about security and spoofing
and idlescan and shite like this and play some fucking PONG
on free CPU power on Cisco routers.
Kill yourself you fucktard.