I really need to get information about IP addresses of users using X-Forward-for, because I use cloudflare CND and now I see just cloudflare IPs in logs... I tried to use Bad Behavior mod, but it doesn't work or I didn't configure it right...
well, the first question is: why are you using cloudflare?
1- it does not actually speed up a forum site
2- if you think that it obfuscates your server IP, then be aware that it does -- but only for people who don't know where to look
It helps to protect my server from script-kiddies, which can make me headache by using LOIC and other tools for "hacking by using just one big red button".
Well, Cloudflare doesn't use X-Forward-For unless they've changed, they use a different header. I forget offhand which it is.
As for protecting from script kiddies, be aware that it is absolutely trivial to obtain your real IP address if your server sends email to them (like, say, the registration email).
"CloudFlare does append both X-Forwarded-For and X-Forwarded-Proto headers" from here https://support.cloudflare.com/hc/en-us/articles/200170946-Does-CloudFlare-include-an-X-Forwarded-For-header-
And about emails - I don't use internal email system to send emails to users, just external, like gmail (external smtp servers). Yes, I'm paranoid :)
Thanks! It works!