Routing all traffic to internet through a linux box

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http://www.linuxquestions.org – I am sharing my DSL internet connection using a modem+wireless router (single device) to 5 systems. I want all my internet traffic to go through one of the linux boxes in my network. The problem here is that wireless devices connect directly to the modem+wireless router. Is such routing of traffic possible?? PS: I am not sure if i could convey my situation clearly... plz do ask for clarifications. thanks in advance, firewiz (HowTos)