[CentOS] iptables default configuration

Rob Kampen rkampen at kampensonline.com
Tue Jan 19 04:05:11 UTC 2010

Carlos Santana wrote:
> Hi,
> I would like to get some inputs on how to configure iptables. I have
> referred to CentOS wiki http://wiki.centos.org/HowTos/Network/IPTables
> and it has been very helpful. I have configured iptables with the help
> of this tutorial, but I haven't understood few things about default
> firewall config.
> - What does 'RH-Firewall-1-INPUT' chain means? This also seems to be a
> predefined chain, although not mentioned in wiki.
> - The wiki page approach is to flush existing rules and then add
> required rules to iptables. Is it possible to add/append required
> rules without flushing existing set of rules? Not sure, but I think
> this is where 'RH-Firewall-1-INPUT' chain comes into picture (user
> defined rules).
> Any explanation or resource link on this would be really helpful.
Try using webmin - there are rpm available for it and the interface 
helps deal with the cryptic items that make up an iptable filter.
The reason for the RH-Firewall-1-INPUT chain means you can use the same 
rule set for multiple items - i.e. both input and forward.
> Thanks,
> CS.
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