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<h1 style="margin-bottom:0;padding-bottom:0;">Blocking and depreferring BGP routes from specific countries</h1>
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<em></em>
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<br><br>
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<p>Hurricane Electric keeps a somewhat up-to-date list of ASNs registered to each country in the world. This is obtainable via:</p>
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<pre data-lang="sh" style="background-color:#2b303b;color:#c0c5ce;" class="language-sh "><code class="language-sh" data-lang="sh"><span style="color:#b48ead;">export </span><span style="color:#bf616a;">COUNTRY</span><span>=</span><span style="color:#a3be8c;">CA </span><span style="color:#65737e;"># This is the country code to look up
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</span><span style="color:#bf616a;">curl -A </span><span>"</span><span style="color:#a3be8c;">asd</span><span>" https://bgp.he.net/country/$</span><span style="color:#bf616a;">COUNTRY </span><span>| </span><span style="color:#bf616a;">grep -o -E </span><span>"</span><span style="color:#a3be8c;">AS([0-9]+)</span><span>" | </span><span style="color:#bf616a;">sort </span><span>| </span><span style="color:#bf616a;">uniq
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</span><span style="color:#65737e;"># You should get a list of ASNs piped to stdout
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</span></code></pre>
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<p>Two types of filters are handy. Blackholing, and depreferring.</p>
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