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I am running Ubuntu 14.04 on a VPS for business purposes. The firewall is setup using ufw; testing reveals that it's working well. I'd like to further secure my server using techniques described here:

http://blog.ls20.com/securing-your-server-using-ipset-and-dynamic-blocklists/

Are there any known conflicts between UFW and ipsets that might cause problems if I were to use ipsets to block malicious hosts attempting to probe my server for vulnerabilities? I understand that ufw makes configuring iptables simpler. My primary concern is the impact on ufw. Are there any known issues with using multiple apps to setup iptables?

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This might not answer your question directly, however...

Why not use PFsense or IPfire rather? They can do all you need and more.

PFSense

Ipfire

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    I'm familiar with PFSense - I use it at home. I do not want to use a full fledged firewall & IDS on the VPS; I want to block known malicious hosts. I looked up IPFire and appears to be overkill for my use case.
    – codewise
    Apr 8, 2016 at 16:17

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