{"id":126,"date":"2011-02-03T23:47:20","date_gmt":"2011-02-04T07:47:20","guid":{"rendered":"http:\/\/seanism.com\/blog\/?p=126"},"modified":"2011-08-03T09:45:51","modified_gmt":"2011-08-03T16:45:51","slug":"comcast-dns-helper","status":"publish","type":"post","link":"https:\/\/seanism.com\/blog\/2011\/02\/comcast-dns-helper\/","title":{"rendered":"Comcast DNS Helper"},"content":{"rendered":"<p><span style=\"font-family: Georgia, 'Bitstream Charter', serif; line-height: 24px; font-size: 16px;\">A client of mine mentioned he wasn&#8217;t able to access his mapped drives over the VPN. \u00a0I remotely connected to his PC and noticed if I pinged hostname.domain.local it resolves to 208.68.139.38. \u00a0I confirmed he was connected to the VPN and I could ping the IP of the PC directly. \u00a0I did a quick lookup of that IP address and it turns out its owned by Comcast. \u00a0Comcast&#8217;s DNS Helper service was to blame. \u00a0They were resolving all failed hostnames to their IP address rather then letting it fail and allowing his companies DNS server to resolve it correctly. <\/span><\/p>\n<p><span style=\"font-family: Georgia, 'Bitstream Charter', serif; line-height: 24px; font-size: 16px;\">To fix this you have 2 options:<br \/>\n<\/span><\/p>\n<ol>\n<li><a href=\"http:\/\/dns-opt-out.comcast.net\/\" target=\"_blank\">Opt-Out of Comcast&#8217;s DNS Helper service<\/a><\/li>\n<li>Switch to a public DNS service like <a href=\"http:\/\/www.opendns.com\/\" target=\"_blank\">OpenDNS<\/a> or <a href=\"http:\/\/code.google.com\/speed\/public-dns\/\" target=\"_blank\">Google&#8217;s DNS servers<\/a><\/li>\n<\/ol>\n<p>Right now Comcast has this enabled by default for all customers with dynamically assigned IP addresses. \u00a0Business customers are not affected.<\/p>\n<p>Below is an article on the topic that is a great read.<br \/>\n<a href=\"http:\/\/www.semicomplete.com\/blog\/geekery\/comcast-dns-hijack-breaks-things.html\" target=\"_blank\">http:\/\/www.semicomplete.com\/blog\/geekery\/comcast-dns-hijack-breaks-things.html<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A client of mine mentioned he wasn&#8217;t able to access his mapped drives over the VPN. \u00a0I remotely connected to his PC and noticed if I pinged hostname.domain.local it resolves to 208.68.139.38. \u00a0I confirmed he was connected to the VPN and I could ping the IP of the PC directly. \u00a0I did a quick lookup&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false},"version":2}},"categories":[3],"tags":[69,70,98,96,97,12],"class_list":["post-126","post","type-post","status-publish","format-standard","hentry","category-it","tag-comcast","tag-dns","tag-helper","tag-issues","tag-resolver","tag-vpn"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p1vc3H-22","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/seanism.com\/blog\/wp-json\/wp\/v2\/posts\/126","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/seanism.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/seanism.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/seanism.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/seanism.com\/blog\/wp-json\/wp\/v2\/comments?post=126"}],"version-history":[{"count":8,"href":"https:\/\/seanism.com\/blog\/wp-json\/wp\/v2\/posts\/126\/revisions"}],"predecessor-version":[{"id":133,"href":"https:\/\/seanism.com\/blog\/wp-json\/wp\/v2\/posts\/126\/revisions\/133"}],"wp:attachment":[{"href":"https:\/\/seanism.com\/blog\/wp-json\/wp\/v2\/media?parent=126"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/seanism.com\/blog\/wp-json\/wp\/v2\/categories?post=126"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/seanism.com\/blog\/wp-json\/wp\/v2\/tags?post=126"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}