{"id":445,"date":"2011-02-17T22:55:00","date_gmt":"2011-02-17T22:55:00","guid":{"rendered":"http:\/\/zensonic.dk\/?p=445"},"modified":"2017-04-09T10:03:43","modified_gmt":"2017-04-09T10:03:43","slug":"debugging-dns-problems","status":"publish","type":"post","link":"https:\/\/zensonic.dk\/?p=445","title":{"rendered":"Debugging dns problems"},"content":{"rendered":"<p>Recently I faced a DNS problem in a complex setup. I had a very locked down jumphost with one public network and two internal networks and a very nazi firewall controlling what packets went in an out.<\/p>\n<p>On the inside I had a linux machine running BIND, also with a firewall and a locked down setup.<\/p>\n<p>On yet another host on the inside, running HP-UX, DNS resolving worked just fine.<\/p>\n<p>On the jumphost it didn&#8217;t work at all.<\/p>\n<p>Took me hours to figure out what was going on. I went over the firewall again and again. On both the jumphost and the DNS server. I went over the bind configuration again and again. The network setup. To no avail. All i got was<\/p>\n<p>Got recursion not available from 192.168.1.79, trying next server<\/p>\n<p>In the end it turned out to be due to the fact that on the linux jump server, I had a two nameserver lines<\/p>\n<p>domain zensonic.dk<br \/>\nsearch zensonic.dk<br \/>\nnameserver 192.168.1.79<br \/>\nnameserver 192.168.1.80<\/p>\n<p>I hadn&#8217;t bothered to setup the DNS at 192.168.1.80 and thus my linux client would not function. As soon as I removed 192.168.1.80 from \/etc\/resolv.conf everything was as it should be. I hope that you, reading this, saves some hours worth of debugging. If you do, drop me a line\/mail\/beer <img src='https:\/\/zensonic.dk\/wp-includes\/images\/smilies\/icon_smile.gif' alt=':-)' class='wp-smiley' \/> <\/p>\n","protected":false},"excerpt":{"rendered":"<p>Recently I faced a DNS problem in a complex setup. I had a very locked down jumphost with one public network and two internal networks and a very nazi firewall controlling what packets went in an out. On the inside I had a linux machine running BIND, also with a firewall and a locked down [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10,19,6,3],"tags":[],"class_list":["post-445","post","type-post","status-publish","format-standard","hentry","category-hp-ux","category-linux-lvm","category-unix","category-work"],"_links":{"self":[{"href":"https:\/\/zensonic.dk\/index.php?rest_route=\/wp\/v2\/posts\/445"}],"collection":[{"href":"https:\/\/zensonic.dk\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zensonic.dk\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zensonic.dk\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/zensonic.dk\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=445"}],"version-history":[{"count":0,"href":"https:\/\/zensonic.dk\/index.php?rest_route=\/wp\/v2\/posts\/445\/revisions"}],"wp:attachment":[{"href":"https:\/\/zensonic.dk\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=445"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zensonic.dk\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=445"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zensonic.dk\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=445"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}