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Not all hosting providers offer DDoS protection. In my case I would probably need to find myself a solution for my VPS against this kind of attacks.

I read a useful documentation with a list of open source DDoS prevention systems.
Not considering those that are not free to use like FastNetMon, or those that seem specifically designed for Apache, like NGINX (I am not using Apache but Puma as a Ruby gem for a Ruby on Rails web application), or again that are primarily meant to monitor ssh connections, like fail2ban, I am considering to try ddos-deflate or HAProxy.

For HAProxy there are updated deb packages, however it is not a mere protection against DDoS, but a more complex piece of software with many functions.
ddos-deflate is specifically designed to block a denial of service attack, having however at first glance a slower development pace than HAProxy (I counted one maintainer and one contributor), and a less responsive or active support service.

I wonder if any of you have experience with either HAProxy or ddos-deflate and would like to share points of view or suggestions.

Asarluhi
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    I think this answer would be interesting for you. – pa4080 Nov 05 '17 at 11:40
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    Hello! May I ask why you mentioned FastNetMon as not free solution? FastNetMon Community edition is open source and completely free tool: https://github.com/pavel-odintsov/fastnetmon It works on almost all Linux distributions, almost all kernel versions and even works on non-x86 architectures like ARM or PowerPC. Also, you could find official Debian packages with FastNetMon: https://packages.debian.org/sid/fastnetmon – Pavel Odintsov Nov 16 '17 at 22:53

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