{"id":135,"date":"2016-08-10T14:23:38","date_gmt":"2016-08-10T12:23:38","guid":{"rendered":"https:\/\/overdespotiet.dk\/blog\/?p=135"},"modified":"2024-06-19T13:34:41","modified_gmt":"2024-06-19T11:34:41","slug":"messing-with-chinese-spammers","status":"publish","type":"post","link":"https:\/\/overdespotiet.dk\/blog\/?p=135","title":{"rendered":"Messing with chinese spammers"},"content":{"rendered":"<p>When you see this in <strong>\/var\/log\/mail.log<\/strong>, you know\u00a0the chinese are out\u00a0to get you:<\/p>\n<pre class=\"brush: bash; gutter: false\">Aug 10 14:15:05 manstein postfix\/smtpd[7858]: connect from static-186-155-242-140.static.etb.net.co[186.155.242.140]\r\nAug 10 14:15:08 manstein postfix\/smtpd[7858]: warning: static-186-155-242-140.static.etb.net.co[186.155.242.140]: SASL LOGIN authentication failed: authentication failure\r\nAug 10 14:15:08 manstein postfix\/smtpd[7858]: lost connection after AUTH from static-186-155-242-140.static.etb.net.co[186.155.242.140]\r\nAug 10 14:15:08 manstein postfix\/smtpd[7858]: disconnect from static-186-155-242-140.static.etb.net.co[186.155.242.140]<\/pre>\n<p>If, like me your first instinct is to\u00a0block the entire IP range\/AS in the firewall range and then secondly you remember that you have a TODO about tinkering with the Mikrotik, adding a dynamic address list of spammers (and SSH bots etc.), you get tired in a hurry.<\/p>\n<p>Luckily, if the bandwidth consumed is small, you can &#8220;just&#8221; null-route the bastards:<\/p>\n<pre class=\"brush: bash; gutter: false\">sudo route add 123.56.236.175 gw 127.0.0.1 lo<\/pre>\n<p>or if you&#8217;re really annoyed:<\/p>\n<pre class=\"brush: bash; gutter: false\">~$ whois 123.56.236.175\r\n% [whois.apnic.net]\r\n% Whois data copyright terms    http:\/\/www.apnic.net\/db\/dbcopyright.html\r\n% Information related to '123.56.0.0 - 123.57.255.255'\r\ninetnum:        123.56.0.0 - 123.57.255.255\r\n.....\r\n% Information related to '123.56.0.0\/15 AS37963'<\/pre>\n<p>and<\/p>\n<pre class=\"brush: bash; gutter: false\">sudo route add -net 123.56.0.0\/15 gw 127.0.0.1 lo<\/pre>\n<p>Boom &#8211; the entire AS is gone, and hopefully the emails\u00a0about your AliExpress purchases are originating in another net&#8230;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>When you see this in \/var\/log\/mail.log, you know\u00a0the chinese are out\u00a0to get you: Aug 10 14:15:05 manstein postfix\/smtpd[7858]: connect from static-186-155-242-140.static.etb.net.co[186.155.242.140] Aug 10 14:15:08 manstein postfix\/smtpd[7858]: warning: static-186-155-242-140.static.etb.net.co[186.155.242.140]: SASL LOGIN authentication failed: authentication failure Aug 10 14:15:08 manstein postfix\/smtpd[7858]: lost &hellip; <a href=\"https:\/\/overdespotiet.dk\/blog\/?p=135\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18,31,30],"tags":[32],"class_list":["post-135","post","type-post","status-publish","format-standard","hentry","category-networking","category-routing","category-smtp","tag-null-route"],"_links":{"self":[{"href":"https:\/\/overdespotiet.dk\/blog\/index.php?rest_route=\/wp\/v2\/posts\/135","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/overdespotiet.dk\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/overdespotiet.dk\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/overdespotiet.dk\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/overdespotiet.dk\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=135"}],"version-history":[{"count":3,"href":"https:\/\/overdespotiet.dk\/blog\/index.php?rest_route=\/wp\/v2\/posts\/135\/revisions"}],"predecessor-version":[{"id":242,"href":"https:\/\/overdespotiet.dk\/blog\/index.php?rest_route=\/wp\/v2\/posts\/135\/revisions\/242"}],"wp:attachment":[{"href":"https:\/\/overdespotiet.dk\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=135"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/overdespotiet.dk\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=135"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/overdespotiet.dk\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=135"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}