Dear People, A simple question for which I have so far found no answer in the Debian documentation. My computer is a domestic, Debian 8.6 AMD-64 box that uses apt-get and aptitude for ugrades and/or installations.
We are currently writing a set of ip_tables rules for a default baseline -A OUTPUT DROP. Thus the rules will block outgoing traffic which is not specifically permitted. The URL specifications in /etc/apt/sources.list of my Debian box contain both HTTP and FTP in the URL for example: http://ftp.nl.debian.org/debian/ and this confuses me. QUESTION: Which data transfer protocol(s) are used for downloads from the Debian Repository to my desktop? Must my firewall ACCEPT -- plain HTTP (port 80) ; or -- is HTTPS (port 443) later involved; or -- active FTP (port 20) used or -- passive FTP (port 1024:65535) applicable ? Can anyone enlighten me please?? Thanks in advance. M.A. Perry --
