Shorewall can also be installed on CentOS 5.2. I would recommend grabbing the shorewall rpm from the EPEL repository at http://download.fedora.redhat.com/pub/epel/5/i386/repoview/S.group.html But first add the repo to yum by downloading the epel-release 5.3 rpm from http://download.fedora.redhat.com/pub/epel/5/i386/repoview/epel-release.html Add this repo to yum by "rpm -i epelreleasefilename.rpm". Its good to use 'priority' to ensure no conflicts with your base and other critical repos. Regards, MarcoGM