[CentOS] CentOS 6.3 as Firewall/Router

Fri Jan 4 17:14:42 UTC 2013
Robert Moskowitz <rgm at htt-consult.com>

On 01/04/2013 12:01 PM, Tim Evans wrote:
> I'm replacing an ancient Solaris 'ipf' firewall/router with a brand 
> new CentOS 6.3 system.  In the olden days, I successfully used the 
> attached iptables script (as /etc/rc.local) on Red Hat 5.x systems, 
> but this doesn't seem to be quite working on the new system.

I once ran a Centos firewall/router.  I used Shorewall for the heavy 
lifting on maintaining the tables properly.  I recommend you find such a 
tool as they tend to get things like below sorted out for you.

> Specifically, while it seems to be routing ok, you cannot connect to 
> anything on the inside net (e.g., with ssh or a browser) and cannot 
> connect to the system with ssh or anything else from elsewhere on the 
> inside net. Yet arp shows this system active.
> Is there obsolete stuff here, and/or anything missing that would cause 
> this?
> Thanks.
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