Sorry for the elementary nature of this question ... I've just installed linux and have a transparent proxy working using iptables ... but my goal is to block ALL non-http traffic in both directions ... that is, i want to allow web access but no instant messenging, no ftp, etc. is there a simple line or two that i can add to iptables? please feel free to tell me to RTFM, but the tutorial i just downloaded is 151 pages, and i admit that i'm looking for a fast solution this morning ... (i'll study the manual on the way home tonight on the train -- i promise!) can anyone help me out? all advice MOST appreciated.
