Hi Discourse Community, usually when I run a webserver I will use this script in combination with cloudflare: https://github.com/Paul-Reed/cloudflare-ufw Im not a fan of a public backend IP since it can easily be found with Censys or similar even if its behind cloudflare reverse proxy. I tried many ways to reproduce this with discourse, but it just won’t work. I also tried this with IPTables: https://gist.github.com/Manouchehri/cdd4e56db6596e7c3c5a Got somebody a similar solution working with discourse?

Docker does stuff that breaks IP tables. You should Google that, I think.

I also agree with him, wish discourse works like this: if you visit direct ip you see a white screen or literally anything, drop the connection without a domain idk

I think you could change the NGINX config so that it would accept connections only from cloudflare. You could also change it so that it would not redirect the bare IP, but I’m not sure that would increase security by much.

[image] Jay Pfaffman: not sure that would increase security by much. It sure would, prevents ip being found by dns , censys/shodan etc. I tried googling how to only allow cf but not much help, I don’t remember what the outcome was, plus if only allowing cf ip’s and im using the cf config to get real ip, would that mess it up? I’d really love if there was a doc. and I don’t know how to edit the nginx config, when I enter app, can’t edit anything, im a bit of a noob sorry lol

The web template adds a redirect for the IP (and any connection), so you could un-do that bit. Allowing Cloudflare IP addresses only in Nginx | inDev. Journal describes how to allow only cloudflare IPs. Figuring out how to get a template to do that is a bit of work for someone who understands the templates, but it should be possible. [image] Genisis: if only allowing cf ip’s and im using the cf config to get real ip, would that mess it up? I No. The real address is in another header. [image] Jay Pfaffman: Docker does stuff that breaks IP tables. You should Google that, I think. Google Search and the first hit (Packet filtering and firewalls | Docker Docs) describes [image] Packet filtering and firewalls How Docker works with packet filtering, iptables, and firewalls So you’d need to change the cloudflare script accordingly.

Unless you run a community that has a history of DDOS attacks for some particular reason and you expect more, I’d not use any more of your brain on it. It would take me an hour or three to figure it out and document it. I have been setting up Discourse for people for a long time and have never worked with someone for whom DDOS was an actual problem.

I do run a forum thats been targeted before, thanks to cf they helped (using pro plan), but it would be great to “prepare” for it before it happens, gotta have the best security right? but yeah I get it, its a lot of work.

I think ChatGPT and the script from the first post could solve it.

I see, hopefully OP can attempt that, I’ll have a look later too, appreciate your help

IPTables and UFW problems

Product Support Self-hosting

Genisis June 20, 2024, 7:49pm 7

this is way above my brain power, I do appreciate your response, will read those docs soon, hope someone sees this who have time and could write something up, ive seen quite a few posts here already regarding this issue

Topic		Replies	Views
Only allow Cloudflare IPs for Discourse server Self-hosting	15	3926	September 22, 2017
如何解决所有流量显示为来自 Cloudflare 的服务器，而不是用户的浏览器 IP Product Support unsupported-install , cloudflare	15	772	May 1, 2026
Failed to bootstrap (/tmp/add-cloudflare-ips) Self-hosting	17	1030	March 22, 2022
Suggestion for Cloudflare template to get real IP from users Self-hosting	3	979	November 28, 2022
Will UFW limit Discourse too? Self-hosting	22	2016	July 11, 2022

IPTables and UFW problems

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