Contain level firwall setting
I am working in a small company and they do not want to spend much
money for firewall and all. now here thing starts for me i want to put alinux
firewall which can do contain level filtering .
we have taken mail services from usa based company who are not providing any kind of filtering coz of that we are getting hell lot spam .. and i heard there are gatway level firewall which can do contain level filtering but coz it costs too much we cannot go for
that ... so can u help me out to put firewall which can fullfil my all requirements
i have heard sth like snort .... which work s (don't know much)
now the thing is i have redhat 9.0 with default kernel what all the things. it's p4 with 512 mb ram ... now what i need
to make it good firewall....