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I want to have a Rate Limiting code with the following options:

  • I'm using CloudFlare, so I want it to look for the real IP address.
  • I want to have a whitelist option
  • I want to make a file with a list of the blocked IP addresses (IPs who reached the threshold).
  • The rate limiting will be 15 requests per 2 seconds, something like that.

I found this answer: https://serverfault.com/a/642357

And it looks great, but will it look for the real IP address? I have this code:

set_real_ip_from 103.21.244.0/22;
set_real_ip_from 103.22.200.0/22;
set_real_ip_from 103.31.4.0/22;
set_real_ip_from 104.16.0.0/12;
set_real_ip_from 108.162.192.0/18;
set_real_ip_from 131.0.72.0/22;
set_real_ip_from 141.101.64.0/18;
set_real_ip_from 162.158.0.0/15;
set_real_ip_from 172.64.0.0/13;
set_real_ip_from 173.245.48.0/20;
set_real_ip_from 188.114.96.0/20;
set_real_ip_from 190.93.240.0/20;
set_real_ip_from 197.234.240.0/22;
set_real_ip_from 198.41.128.0/17;
set_real_ip_from 199.27.128.0/21;
set_real_ip_from 2400:cb00::/32;
set_real_ip_from 2606:4700::/32;
set_real_ip_from 2803:f800::/32;
set_real_ip_from 2405:b500::/32;
set_real_ip_from 2405:8100::/32;

# use any of the following two
real_ip_header CF-Connecting-IP;
#real_ip_header X-Forwarded-For;

And also, how do I make this code listing the blocked IP addresses into a new file?

HTMHell
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  • I don't think Nginx can write the IPs to a file. If you really need that you could look at using fail2ban. – Tim Jul 25 '17 at 19:16

2 Answers2

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It's possible to rate limit using the IP from xff header sent by CF:

http {
limit_req_zone  "$http_x_forwarded_for" zone=zone:10m rate=2r/s;
server {

location /{
            limit_req zone=zone burst=5;
        }

more info: https://www.keycdn.com/blog/x-forwarded-for-cdn/

Dmitry Sherman
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I would use the header made for this...

 limit_req_zone $http_cf_connecting_ip zone=YourZone:10m rate=2r/s;

This should return the connecting ip from the edge server.

Pir8radio
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