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Update 20151215 How to block network traffic by country on Linux.md
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sources/tech/20151215 How to block network traffic by country on Linux.md
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How to block network traffic by country on Linux
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As a system admin who maintains production Linux servers, there are circumstances where you need to **selectively block or allow network traffic based on geographic locations**. For example, you are experiencing denial-of-service attacks mostly originating from IP addresses registered with a particular country. You want to block SSH logins from unknown foreign countries for security reasons. Your company has a distribution right to online videos, which requires it to legally stream to particular countries only. You need to prevent any local host from uploading documents to any non-US remote cloud storage due to geo-restriction company policies.
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[4]:http://xtables-addons.sourceforge.net/
[5]:https://support.maxmind.com/geoip-faq/geoip2-and-geoip-legacy-databases/how-accurate-are-your-geoip2-and-geoip-legacy-databases/
[6]:http://ask.xmodulo.com/add-cron-job-linux.html
[7]:https://en.wikipedia.org/wiki/ISO_3166-1
[7]:https://en.wikipedia.org/wiki/ISO_3166-1