I was noticing some really strange requests in my web server’s log files on a VPS that I manage. Requests that seem to be focused on finding vulnerabilities or exploits. Turns out most of the originating IP addresses are from China. Since the VPS is not behind a router or otherwise managed firewall device, I decided to investigate if I could just block all traffic from China to my VPS. Turns out the software “Uncomplicated Firewall” or better know as UFW, that I already had running can do this easily. If you’re new to UFW have a look at this very comprehensive page showing how to set it up.
Here are two examples showing how to setup your UFW firewall to block IP addresses or ports based on Geo location. This should work on any system running UFW but in this case I did it on a headless Ubuntu 18.04 system. Click on Read more to view the rest of this article.Continue reading