[CentOS] Centos Router

With the current discuss of "Performance of CentOS as a NAT gateway", I
am curious how many people out there are using CentOS as a
Router/Firewall in an enterprise or service provider environment.  For
myself I am not really concerned about NAT just a stateful firewall. 

The other half of my questions is about performance.  I have read many
articles and posts on the net about performance tuning but they all seem
to be about tuning a single host, not a router.  Does any have any tips
in this area?  Is tuning even required.

For the sake of the conversation lets assume I am referring to CentOS 5.

Graham Johnston
Manager, Network Services
Westman Communications Group
204.571.7225
johnstong at westmancom.com
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