[CentOS] Centos Router

Feizhou feizhou at graffiti.net
Wed Sep 12 02:31:56 UTC 2007

Graham Johnston wrote:
> 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.

For stateful firewalls, one should use OpenBSD and pf if .

netfilter has caught up on the stateful side with tcp window tracking 
but I do not think that support is in Centos 4 and below. Centos 5 
should have it.

> 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.

If it is a natting firewall, forget about performance. There is a 
maximum to natting support beyond configuring the maximum number of 
connections being tracked.

Bridging stateful firewalls will find OpenBSD both more stable and 
better performing. Non-natting stateful firewalls no comment sorry.

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

For full stateful support, we would have to. All previous Centos only 
offer connection tracking.

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