Hello list, I am pretty new to this list and this is my first post. I wasn´t able to find a solution for my problem in any support-db or anywhere else... Please write, if my mails are in any other format than txt, because I am sitting in front of an apple at the moment and am not sure if this apple is configured correctly. thx The problem: A couple of Macintoshs want to communicate with a Linux-PC with iptables installed, they need to pop/send their mail (thats no prob) and need to post some files on the Linux-System, but not with appletalk (afpovertcp), but with tcp. So the questions are: 1. How can I enable the ddp-protocol within my iptables? ´iptables ... -p ddp ...´ doesn´t work. 2. Which ports need to be opened to let macs and linux communicate with each other? Thank you in advance Enrico Scichilone --