Passing all traffic through Cloudflare

Posted by Nick on Server Fault See other posts from Server Fault or by Nick
Published on 2012-06-13T21:30:39Z Indexed on 2012/06/17 15:18 UTC
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Filed under:

ubuntu

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nginx

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iptables

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ddos

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cloudflare

I am new to Linux System Administration and I am experimenting with iptables trying to learn how to really lock down a system with them. And one thing a friend of mine recommended was that there was a way to pass all incoming traffic through Cloudflare so even if attackers resolved the server ip they still couldn't (D)dos it directly.

This is exactly what they said: "Simply config your servers iptables to only allow incoming connections from CloudFlares IP ranges then set it to allow only your IP/IP range to connect on port 21 (SSH)"

Could someone help me on what command I'd need to run for Ubuntu to get this effect?

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