[CentOS] Optimizing CentOS for gigabit firewall

sadas sadas mailrc at abv.bg
Fri Dec 18 20:49:18 UTC 2009

 What about NetBSD? I heard that NetBSD has the best network stack out there. Maybe NetBSD with pf is the best choice?

   >>> I can't find information is there linux or BSD distribution with effective
 >>> firewall that uses optimized algorithm to store hundreds of IPs and to
 >>> forward huge traffic. Any idea?
 >> Hundreds?
 >> http://www.openbsd.org/faq/pf/tables.html
 >> "A table is used to hold a group of IPv4 and/or IPv6 addresses. Lookups
 >> against a table are very fast and consume less memory and processor time
 >> than lists. For this reason, a table is ideal for holding a large group of
 >> addresses as the lookup time on a table holding 50,000 addresses is only
 >> slightly more than for one holding 50 addresses. Tables can be used in the
 >> following ways:
 >>     * source and/or destination address in filter, NAT, and redirection rules.
 >>     * translation address in NAT rules.
 >>     * redirection address in redirection rules.
 >>     * destination address in route-to, reply-to, and dup-to filter rule
 >> options."
 >> nuff said ?
 >> I love linux, I've been using it for almost 15 years now, I absolutely
 >> hate iptables(and ipchains, and ipfwadm). By contrast I absolutely
 >> hate everything about OpenBSD except for pf(which I love, ipfw and
 >> ipf aren't too bad either, at least for the era), so I use OpenBSD
 >> for firewalls, and linux for everything else.
 >I can back this; during 2009, I deployed a bunch of load balancers
 >running OpenBSD (using pf, carpd, and relayd). I used to be a super die
 >hard BSD guy, but through the years and having used/deployed/propagated
 >NetBSD, then FreeBSD, then OpenBSD, then NetBSD again, I took one of my
 >usual once-a-year looks at GNU/Linux (this time, it was CentOS, after
 >having worked with RHEL for some years), I got settled here.
 >Long story short: I'd really recommend OpenBSD for your task. iptables
 >really sucks. I recently deployed some machines running several virtual
 >instances (however still the cheapest *proven* way to get several IP
 >stacks in Linux) doing L2 routing, I threw iptables off of that machines
 >because it just can't handle stuff at that rate. OpenBSD rocks, I even
 >have a setup running (active-active, load balanced) at about 40Mbps
 >using Alix boards [0] -- they rock, and they are no way busy.
 >OpenBSDs documentation is the best out there, it's documentational
 >quality is what I really really badly miss in the Linux world. However,
 >the community is a bunch of (sorry in advance) assholes. But this is
 >well known throughout the internet, so: You have been warned. Great
 >product, totally lame vendor. ;)
 >[0] -- http://pcengines.ch/alix.htm
 >> nate
 >CentOS mailing list
 >CentOS at centos.org
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