I am using RHEL 4 and have created a custom Firewall script .

The systems has 2 lan cards etho and eth1 configured with the respective internal and external ips .

When i run the firewall script it runs perfectly without any errors ,but when i run the command

service iptables status ,it seems to run the internal Iptables script .

I have made the changes in the below files

/etc/sysctl.conf
/etc/rc.d/rc.local - added the path of the firewall script
Have made the Firewall script executable
added the command echo "1" > /proc/sys/net/ipv4/ip_forward in the firewall script

I can Ping external websites from the linux server and also the clients can ping the DNS ,but cannot access the websites.


Do i need to link the firewall script file so that it starts at boot up .

Pl let me know where am i going wrong .Am i missing any pre-requisites before a custom made firewall script needs to be run.

regds

Sudarshan'

I believe the convention on Red Hat (and Red Hat-based) distros is to not have an iptables script run at startup, and instead just save your configuration after executing your script. That would mean doing a "service iptables save" right after executing your script. Then your iptables configuration gets automatically restored every boot, without you having to edit any startup scripts or anything like that.