{"id":209,"date":"2007-08-30T17:14:21","date_gmt":"2007-08-30T15:14:21","guid":{"rendered":"http:\/\/www.kill-9.it\/blog\/index.php\/2007\/08\/30\/ahah-sigh-tiscali-smtp-internal-relay-sucks\/"},"modified":"2007-08-30T17:14:21","modified_gmt":"2007-08-30T15:14:21","slug":"ahah-sigh-tiscali-smtp-internal-relay-sucks","status":"publish","type":"post","link":"https:\/\/www.kill-9.it\/blog\/index.php\/2007\/08\/30\/ahah-sigh-tiscali-smtp-internal-relay-sucks\/","title":{"rendered":"Ahah, sigh (Tiscali smtp internal relay sucks)"},"content":{"rendered":"<p><code><br \/>\nbeepbeep:~ zen$ <strong>telnet smtp.tiscali.it 25<\/strong><br \/>\nTrying 213.205.33.13...<br \/>\nConnected to smtp.tiscali.it.<br \/>\nEscape character is '^]'.<br \/>\n421 averell.tiscali.it Service not available - too many connections<\/p>\n<p>beepbeep:~ zen$ <strong>telnet smtp.tiscali.it 25<\/strong><br \/>\nTrying 213.205.33.13...<br \/>\nConnected to smtp.tiscali.it.<br \/>\nEscape character is '^]'.<br \/>\n220 joe.tiscali.it ESMTP Service (7.3.122) ready<br \/>\n<\/code><\/p>\n<p>That is, the smtp relay for the entire tiscali network in Italy is a load balancer with ip address <strong>213.205.33.13<\/strong>, which balances over two hosts<\/p>\n<ul>\n<li><strong>averell.tiscali.it<\/strong> has address 213.205.33.55<\/li>\n<li><strong>joe.tiscali.it<\/strong> has address 213.205.33.54<\/li>\n<\/ul>\n<p>Anyway, it looks like the balancer has been configured with a dumb round robin (and with limits greater than those configured on the backend hosts). Please note that I&#8217;m connecting always from the same IP.<br \/>\nNet result: the balancer is useless. Half of the connections to the service get reset because of a single overloaded host. An innovative way to rate-limit the use of a service.<\/p>\n<p>I&#8217;m writing this post waiting for my mails to get through.<br \/>\nBeing sick and locked inside home makes me aggressive, did you notice?<\/p>\n","protected":false},"excerpt":{"rendered":"<p>beepbeep:~ zen$ telnet smtp.tiscali.it 25 Trying 213.205.33.13&#8230; Connected to smtp.tiscali.it. Escape character is &#8216;^]&#8217;. 421 averell.tiscali.it Service not available &#8211; too many connections beepbeep:~ zen$ telnet smtp.tiscali.it 25 Trying 213.205.33.13&#8230; Connected to smtp.tiscali.it. Escape character is &#8216;^]&#8217;. 220 joe.tiscali.it ESMTP Service (7.3.122) ready That is, the smtp relay for the entire tiscali network in Italy &hellip; <a href=\"https:\/\/www.kill-9.it\/blog\/index.php\/2007\/08\/30\/ahah-sigh-tiscali-smtp-internal-relay-sucks\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Ahah, sigh (Tiscali smtp internal relay sucks)&#8221;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6,3],"tags":[],"class_list":["post-209","post","type-post","status-publish","format-standard","hentry","category-english","category-geek"],"_links":{"self":[{"href":"https:\/\/www.kill-9.it\/blog\/index.php\/wp-json\/wp\/v2\/posts\/209","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.kill-9.it\/blog\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.kill-9.it\/blog\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.kill-9.it\/blog\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.kill-9.it\/blog\/index.php\/wp-json\/wp\/v2\/comments?post=209"}],"version-history":[{"count":0,"href":"https:\/\/www.kill-9.it\/blog\/index.php\/wp-json\/wp\/v2\/posts\/209\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.kill-9.it\/blog\/index.php\/wp-json\/wp\/v2\/media?parent=209"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.kill-9.it\/blog\/index.php\/wp-json\/wp\/v2\/categories?post=209"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.kill-9.it\/blog\/index.php\/wp-json\/wp\/v2\/tags?post=209"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}