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Comment by txdv | Hacker News Reader

I blocked all Chinese subnets because of the constant tries to log in to my servers.

Obviously Xiaomi devices do not work in my network anymore.

How also can you make a guide of how to do it?

    iptables -I INPUT -m geoip --src-cc CH -j DROP
    iptables -I OUTPUT -m geoip --src-cc CH -j DROP

No guide needed.

CH is not China but Switzerland.

CN then?

Correct, I messed up the original country code.

V2ray has the option to route based on geoip, but it creates a socks/http proxy, not a whole system solution.