Wasn't sure how to word the title. I've got i'Tunes music sharing turned on in the 'Firewall' pane of the 'Sharing' preferences. If I don't do this then my two macs connected over an ethernet broadband router won't see each other's files. Does this open me up to internet hacking or is it normal to have this option on when sharing iTunes over a local network? The thing is that I don't remember having to turn this on in the past but I do now?