sharing internet connection, using my desktop as a wifi hotspot

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http://www.linuxquestions.org – hello. this is my first time posting in a forum, sorry if i'm being stiff. i'll try to post as much information as necessary and make clear my objective. also, as to my level of intellect with respect to linux, i hopefully see myself as leaving the newbie stage. i have two computers: - one is my desktop, running ubuntu. it has two NIC's one is wired (eth0), the other is wireless (wlan0). - the other is my laptop, running archlinux. two NIC's as well (eth & wlan). i would like to connect my desktop to my router via eth0 and connect my laptop to my desktop via wlan0, providing internet (HowTos)