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Old 03-15-2004, 02:12 AM   #1
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Registered: Mar 2004
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Smile Configure rh9 as a firewall and router for my windows webserver

Hi All,

Can you help me how to setup my rh9 linux box as firewall/router for my internal network as internet gateway and router to provide connection for windows web server and show to internet.

Additional question how to setup/create iptables rules to run automatically after booting.

thanks in advance.

Old 03-15-2004, 03:07 AM   #2
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Registered: May 2003
Location: istanbul
Distribution: debian - redhat - others
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u need to read howto's.. u can find them at
i will try to explain basicly..

1 - first u must enable routing. edit /etc/sysctl.conf and change the line like this
net.ipv4.ip_forward = 1

2 - enable SNAT (to allow web server reply tcp packets comes from internet)
iptables -t nat -A POSTROUTING -s web_server_ip -j SNAT --to linux_public_ip

3 - redirect tcp port 80 pakets which comes from internet, to web server.. change eth0 to interface which connected to internet..
iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j DNAT --to web_server_ip

u must read howtos to config your linux as a firewall. these commands just redirects tcp 80 port to web server. and allow webserver ro reach internet via NAT.

following line will save iptables configuration..
service iptables save

this line shows the config of iptables
service iptables status


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