{"id":880,"date":"2015-06-19T11:06:20","date_gmt":"2015-06-19T09:06:20","guid":{"rendered":"https:\/\/bergs.biz\/blog\/?p=880"},"modified":"2016-07-15T13:47:37","modified_gmt":"2016-07-15T11:47:37","slug":"avg-cant-get-dns-setup-right","status":"publish","type":"post","link":"https:\/\/bergs.biz\/blog\/2015\/06\/19\/avg-cant-get-dns-setup-right\/","title":{"rendered":"AVG can\u2019t get DNS Setup right"},"content":{"rendered":"<p>It seems that antivirus company <a href=\"http:\/\/www.avg.com\/\" target=\"_blank\">AVG<\/a> can\u2019t get their DNS Setup right.<\/p>\n<p>Today I spotted the below in syslog:<\/p>\n<pre>DNS format error from 204.193.144.47#53 resolving crashportal.avg.com\/AAAA for client 127.0.0.1#34590: Name avg.com (SOA) not subdomain of zone crashportal.avg.com -- invalid response<\/pre>\n<p>So the AVG updater tried to contact via IPv6, as a record type of AAAA was requested, a host called <code>crashportal.avg.com<\/code>. To do so it had to &#8220;resolve&#8221; that hostname <code>crashportal.avg.com<\/code> to an IP address in order to submit a crash dump for a recent crash of their virus scanner (very trustworthy!), and the DNS resolver failed to resolve the IP address. So why is this?<\/p>\n<p>Let&#8217;s see:<\/p>\n<pre># dig -t AAAA crashportal.avg.com\r\n\r\n; &lt;&lt;&gt;&gt; DiG 9.9.5-9-Debian &lt;&lt;&gt;&gt; -t AAAA crashportal.avg.com\r\n;; global options: +cmd\r\n;; Got answer:\r\n;; -&gt;&gt;HEADER&lt;&lt;- opcode: QUERY, status: SERVFAIL, id: 21322\r\n;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1<\/pre>\n<p>Huh? We can&#8217;t resolve this because our server failed? Let&#8217;s see what&#8217;s going on&#8230;<\/p>\n<pre># dig -t SOA avg.com\r\n\r\n; &lt;&lt;&gt;&gt; DiG 9.9.5-9-Debian &lt;&lt;&gt;&gt; -t SOA avg.com\r\n;; global options: +cmd\r\n;; Got answer:\r\n;; -&gt;&gt;HEADER&lt;&lt;- opcode: QUERY, status: NOERROR, id: 42124\r\n;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 6, ADDITIONAL: 3\r\n\r\n;; OPT PSEUDOSECTION:\r\n; EDNS: version: 0, flags:; udp: 4096\r\n;; QUESTION SECTION:\r\n;avg.com.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 IN\u00a0\u00a0\u00a0\u00a0\u00a0 SOA\r\n\r\n;; ANSWER SECTION:\r\navg.com.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1160\u00a0\u00a0\u00a0 IN\u00a0\u00a0\u00a0\u00a0\u00a0 SOA\u00a0\u00a0\u00a0\u00a0 ns.grisoft.cz. domainadministration.avg.com. 2015061601 86400 3600 1209600 10800\r\n\r\n;; AUTHORITY SECTION:\r\navg.com.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 172607\u00a0 IN\u00a0\u00a0\u00a0\u00a0\u00a0 NS\u00a0\u00a0\u00a0\u00a0\u00a0 a11-66.akam.net.\r\navg.com.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 172607\u00a0 IN\u00a0\u00a0\u00a0\u00a0\u00a0 NS\u00a0\u00a0\u00a0\u00a0\u00a0 a20-66.akam.net.\r\navg.com.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 172607\u00a0 IN\u00a0\u00a0\u00a0\u00a0\u00a0 NS\u00a0\u00a0\u00a0\u00a0\u00a0 a13-65.akam.net.\r\navg.com.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 172607\u00a0 IN\u00a0\u00a0\u00a0\u00a0\u00a0 NS\u00a0\u00a0\u00a0\u00a0\u00a0 a26-67.akam.net.\r\navg.com.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 172607\u00a0 IN\u00a0\u00a0\u00a0\u00a0\u00a0 NS\u00a0\u00a0\u00a0\u00a0\u00a0 a1-182.akam.net.\r\navg.com.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 172607\u00a0 IN\u00a0\u00a0\u00a0\u00a0\u00a0 NS\u00a0\u00a0\u00a0\u00a0\u00a0 a6-67.akam.net.<\/pre>\n<p>Ok, so the above quoted Akamai nameservers should be able to help&#8230; Let&#8217;s see:<\/p>\n<pre># dig -t AAAA crashportal.avg.com @a11-66.akam.net.\r\n\r\n; &lt;&lt;&gt;&gt; DiG 9.9.5-9-Debian &lt;&lt;&gt;&gt; -t AAAA crashportal.avg.com @a11-66.akam.net.\r\n;; global options: +cmd\r\n;; Got answer:\r\n;; -&gt;&gt;HEADER&lt;&lt;- opcode: QUERY, status: NOERROR, id: 63788\r\n;; flags: qr rd ad; QUERY: 1, ANSWER: 0, AUTHORITY: 3, ADDITIONAL: 4\r\n;; WARNING: recursion requested but not available\r\n\r\n;; OPT PSEUDOSECTION:\r\n; EDNS: version: 0, flags:; udp: 4096\r\n;; QUESTION SECTION:\r\n;crashportal.avg.com.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 IN\u00a0\u00a0\u00a0\u00a0\u00a0 AAAA\r\n\r\n;; AUTHORITY SECTION:\r\ncrashportal.avg.com.\u00a0\u00a0\u00a0 300\u00a0\u00a0\u00a0\u00a0 IN\u00a0\u00a0\u00a0\u00a0\u00a0 NS\u00a0\u00a0\u00a0\u00a0\u00a0 gtm-atl.avg.com.\r\ncrashportal.avg.com.\u00a0\u00a0\u00a0 300\u00a0\u00a0\u00a0\u00a0 IN\u00a0\u00a0\u00a0\u00a0\u00a0 NS\u00a0\u00a0\u00a0\u00a0\u00a0 gtm-self.avg.com.\r\ncrashportal.avg.com.\u00a0\u00a0\u00a0 300\u00a0\u00a0\u00a0\u00a0 IN\u00a0\u00a0\u00a0\u00a0\u00a0 NS\u00a0\u00a0\u00a0\u00a0\u00a0 gtm-tnt.avg.com.\r\n\r\n;; ADDITIONAL SECTION:\r\ngtm-atl.avg.com.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 3000\u00a0\u00a0\u00a0 IN\u00a0\u00a0\u00a0\u00a0\u00a0 A\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 204.193.144.47\r\ngtm-tnt.avg.com.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 3000\u00a0\u00a0\u00a0 IN\u00a0\u00a0\u00a0\u00a0\u00a0 A\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 173.245.115.70\r\ngtm-self.avg.com.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 3000\u00a0\u00a0\u00a0 IN\u00a0\u00a0\u00a0\u00a0\u00a0 A\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 212.96.161.252<\/pre>\n<p>So the server was not authoritative to answer the request and pointed us to a different set of servers<code><\/code>.<\/p>\n<p>Note that the IP address from my error message (<code>204.193.144.47<\/code>) belongs to one of the nameservers mentioned above!<\/p>\n<p>Ok, let&#8217;s ask that server:<\/p>\n<pre># dig -t AAAA crashportal.avg.com @204.193.144.47\r\n\r\n; &lt;&lt;&gt;&gt; DiG 9.9.5-9-Debian &lt;&lt;&gt;&gt; -t AAAA crashportal.avg.com @204.193.144.47\r\n;; global options: +cmd\r\n;; Got answer:\r\n;; -&gt;&gt;HEADER&lt;&lt;- opcode: QUERY, status: NOERROR, id: 47390\r\n;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1\r\n;; WARNING: recursion requested but not available\r\n\r\n;; OPT PSEUDOSECTION:\r\n; EDNS: version: 0, flags:; udp: 4096\r\n;; QUESTION SECTION:\r\n;crashportal.avg.com.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 IN\u00a0\u00a0\u00a0\u00a0\u00a0 AAAA\r\n\r\n;; AUTHORITY SECTION:\r\navg.com.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 60\u00a0\u00a0\u00a0\u00a0\u00a0 IN\u00a0\u00a0\u00a0\u00a0\u00a0 SOA\u00a0\u00a0\u00a0\u00a0 gtm-tnt.avg.com. hostmaster.gtm-tnt.avg.com. 2015052909 10800 3600 604800 60<\/pre>\n<p>Why does the nameserver respond with an SOA record even though it&#8217;s supposed to be authoritative and was asked for <code>AAAA<\/code>? It&#8217;s not a delegation as &#8212; and this is exactly the error message &#8212; <code>avg.com<\/code> is <em>not<\/em> a subdomain of <code>crashportal.avg.com<\/code>. Duh!<\/p>\n<p>In my humble opinion it is very disappointing if an IT security company cannot even get the basics right, such as DNS.<\/p>\n<p>This issue reminded me of another similar issue I observed a while ago: <a href=\"https:\/\/bergs.biz\/blog\/2015\/02\/25\/avira-cant-get-their-dns-setup-right\/\" target=\"_blank\">Avira can\u2019t get their DNS Setup right<\/a>. And guess what? This was an antivirus company, too&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>It seems that antivirus company AVG can\u2019t get their DNS Setup right. Today I spotted the below in syslog: DNS format error from 204.193.144.47#53 resolving crashportal.avg.com\/AAAA for client 127.0.0.1#34590: Name avg.com (SOA) not subdomain of zone crashportal.avg.com &#8212; invalid response So the AVG updater tried to contact via IPv6, as a record type of AAAA [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[84,11],"tags":[144],"class_list":["post-880","post","type-post","status-publish","format-standard","hentry","category-networking-computers","category-what-the-f","tag-dns"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>AVG can\u2019t get DNS Setup right - Ralf&#039;s Blog<\/title>\n<meta name=\"description\" content=\"AVG can\u2019t get DNS Setup right.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/bergs.biz\/blog\/2015\/06\/19\/avg-cant-get-dns-setup-right\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"AVG can\u2019t get DNS Setup right - 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