Care to share a bit more details on what you are doing with the HyperVM server?
There are many different types/setups of firewalls and all have different throughput levels also.
Are you filtering traffic? trying to prevent DDOS? Rate Limiting?
Do you want a hardware or software solution?
If you can give us some more details on what the server is doing, what traffic levels you expect, and what you want to acheive i'm sure we can start recommending something for you...
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To counter a DDOS attack the most important thing to do is make your IP banlist ENDLESS. This means you dont make IP limits in your list. With large ddos attacks this causes new ips to replace the old ips in your banlist. Causing the DDOS to continue. With any firewall, hardware or software, this will cause a problem.
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How critical is your purpose ?
Because countering DDOS attacks will need endless ip ban list and also needs huge RAM, if you are going to implement it for typical purpose just use
CSF its fine and will safeguard you to some descent extend.