{"id":50,"date":"2008-04-04T18:35:32","date_gmt":"2008-04-04T17:35:32","guid":{"rendered":"http:\/\/www.steve-meier.de\/?p=50"},"modified":"2008-04-04T18:35:46","modified_gmt":"2008-04-04T17:35:46","slug":"linux-die-zeit-und-das-internet","status":"publish","type":"post","link":"https:\/\/www.steve-meier.de\/?p=50","title":{"rendered":"Linux, die Zeit und das Internet"},"content":{"rendered":"<p>Die meisten Linux-Installationen teilen dem Internet offenherzig mit, was die lokale Uhr geschlagen hat. Das sollte man aus Sicherheitsgr\u00fcnden allerdings unterbinden. Wie ? Ganz einfach:<\/p>\n<p><code>iptables -A INPUT -p icmp --icmp-type 13 -j DROP<\/code><br \/>\nverwirft alle eingehenden ICMP Timestamp-Anfragen<\/p>\n<p><code>sysctl net.ipv4.tcp_timestamps=0<\/code><br \/>\nschaltet die Timestamps f\u00fcr TCP-Verbindungen ab<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Die meisten Linux-Installationen teilen dem Internet offenherzig mit, was die lokale Uhr geschlagen hat. Das sollte man aus Sicherheitsgr\u00fcnden allerdings unterbinden. Wie ? Ganz einfach: iptables -A INPUT -p icmp &#8211;icmp-type 13 -j&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"_links":{"self":[{"href":"https:\/\/www.steve-meier.de\/index.php?rest_route=\/wp\/v2\/posts\/50"}],"collection":[{"href":"https:\/\/www.steve-meier.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.steve-meier.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.steve-meier.de\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.steve-meier.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=50"}],"version-history":[{"count":0,"href":"https:\/\/www.steve-meier.de\/index.php?rest_route=\/wp\/v2\/posts\/50\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.steve-meier.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=50"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.steve-meier.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=50"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.steve-meier.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=50"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}