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Hi, I running on Redhat 8.0 and would like to install a firewall. I do run a webserver on the box. I'm not familiar with firewalls so I was hoping someone would give me a suggestion to which dist. of firewall I should install. Thanks
Distribution: Emacs and linux is its device driver(Slackware,redhat)
if you are new to firewalls here is a thing to keep in mind do not thingk like windows there is only one firewall in linux it is iptables(ipchains in the old kernels) other are just wrapper to help you configure them so they all use iptables
You tell the web site what you want to do with your machine, and it writes an ipchains script for you. Works great. I got a script from the website, then was able to just modify it from then on, because the script the web site writes for you based on your desires is very instructive and interesting.
Last edited by jlangelier; 08-08-2003 at 02:52 AM.
// Edit: Sorry missed that you run the box as a server. In that case I do not recommend the script below. A server will need logging and other fun stuff. //
Since my machine is a simple desktop I use a bare-bones script that allows all outgoing and allows incoming answers but nothing else. It is not perfect (lacks logging, leaves unused outgoing ports open) but it's simple and works.
Save this in as firewall, chown root firewall, chmod 744 firewall, and make it start from your initscripts (in Arch this is a matter of copying the file to rc.d dir and adding the scriptname to the deamons array in rc.conf, RedHat will use a different location).
# /etc/rc.d/firewall: start/stop firewall
if [ "$1" = "start" ]; then
/usr/sbin/iptables -P OUTPUT ACCEPT
/usr/sbin/iptables -P FORWARD DROP
/usr/sbin/iptables -P INPUT DROP
/usr/sbin/iptables -A INPUT -i eth0 -m state \
--state ESTABLISHED,RELATED -j ACCEPT
elif [ "$1" = "stop" ]; then
killall -q /usr/sbin/iptables
echo "usage: $0 start|stop"
#End of file