Which Firewall do you use to protect your servers?
csf as well as iptables are good one.
Comodo firewall is rather good, however I hadn't used it(((
I have used comodo firewall...it works well when you do the settings well....... Otherwise everytime the popup will occur and you have to respond accordingly...... So you will find it irritating.....
Sorry for digging up a rather old post. I have tried them all and leak tested them all very thoroughly and I have to say the 2 best out of the box are Commodo (free) and Eset/Nod32.
Another good one that I have tested is Ghostwall, it takes a bit of technique to configure but works well.
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OP, hardware firewall or software?
Have you considered using cloud based WAF for a front-gate solution?
Today you can get a PCI compliant Web Application Firewall for few dozen dollars a month (with no extra upkeep costs) with added features, like CDN proxy acceleration, as an added bonus.
Also, as this is all front-end, you`ll save a lot of Bandwidth due to bot filtering/caching.
If you must use back-end, I think that a good software is enough.