{"id":941,"date":"2007-11-13T18:25:49","date_gmt":"2007-11-13T18:25:49","guid":{"rendered":"http:\/\/www.markwilson.co.uk\/blog\/2007\/11\/managing-simultaneous-access-to-resources-from-both-internal-and-external-dns-namespaces.htm"},"modified":"2007-11-13T18:25:49","modified_gmt":"2007-11-13T18:25:49","slug":"managing-simultaneous-access-to-resources-from-both-internal-and-external-dns-namespaces","status":"publish","type":"post","link":"https:\/\/www.markwilson.co.uk\/blog\/2007\/11\/managing-simultaneous-access-to-resources-from-both-internal-and-external-dns-namespaces.htm","title":{"rendered":"Managing simultaneous access to resources from both internal and external DNS namespaces"},"content":{"rendered":"<p>When I originally set up my Active Directory, I used an internal DNS namespace, with a .local TLD (as was the advice at the time &#8211; no longer recommended).  Essentially, my external domains are managed by my hosting providers and I manage the internal namespace.  Simple.<\/p>\n<p>Then I set up a few Internet-facing resources at home. I decided to create a secondary forest using a subdomain of my main external DNS namespace so that:<\/p>\n<ul>\n<li><em>domain<\/em>.<em>local<\/em> was the AD-integrated DNS for internal (private) resources.<\/li>\n<li><em>domain<\/em>.<em>tld<\/em> was managed by <a href=\"http:\/\/www.ascomi.net\/\">my hosting provider<\/a> for external resources.<\/li>\n<li><em>subdomain<\/em>.<em>domain<\/em>.<em>tld<\/em> was the AD-integrated DNS for Internet-facing resources under my control.<\/li>\n<\/ul>\n<p>I also added a forwarding rule on the DNS server to send requests for <em>subdomain<\/em>.<em>domain<\/em>.<em>tld<\/em> to the authoritative DNS server for the domain (under my control) but to send requests for <em>domain<\/em>.<em>tld<\/em> and all other domains to the ISP&#8217;s DNS servers.<\/p>\n<p>That worked well but, because my mail server is known by two different names internally and externally (<em>mailserver<\/em>.<em>domain<\/em>.<em>tld<\/em> for external access and <em>mailserver<\/em>.<em>subdomain<\/em>.<em>domain<\/em>.<em>tld<\/em> for internal access) and these actually resolve to the same physical server, I get certificate errors when using the internal name.  Furthermore, I&#8217;m unable to access the server from inside my firewall using the external name, because the <em>mailserver<\/em>.<em>domain<\/em>.<em>tld<\/em> name actually resolves to the IP address of my router, from where which IP filtering and NAT forwarding rules allow the packets to be forwarded to the mail server.<\/p>\n<p>I needed mail clients to work with the same server name (<em>mailserver<\/em>.<em>domain<\/em>.<em>tld<\/em>) whether they were accessing the server on the internal or external networks, so I made some changes:<\/p>\n<ol>\n<li>My hosting provider sent me a copy of the DNS zone file for <em>mailserver<\/em>.<em>domain<\/em>.<em>tld<\/em> and I imported this to my internal DNS server.<\/li>\n<li>Next, I deleted the forwarding rule for <em>mailserver<\/em>.<em>domain<\/em>.<em>tld<\/em> (leaving the one for <em>subdomain<\/em>.<em>domain<\/em>.<em>tld<\/em> in place).<\/li>\n<li>Then, I edited the entries for the servers that needed to be accessed with the same name internally and externally so that instead of resolving to the external IP address of my router, they resolved to the actual IP address of the server (which uses an <a href=\"http:\/\/www.faqs.org\/rfcs\/rfc1918.html\">RFC 1918<\/a> internal IP address range).<\/li>\n<li>Finally, <code>nslookup<\/code> helped me to confirm that the addresses were resolving correctly on the internal and external networks &#8211; effectively getting one set of results in the Internet from my hosting provider and another set on the internal network from my DNS server.<\/li>\n<\/ol>\n<p>The new setup looks like this (note that the IP addresses have been changed to protect the innocent):<\/p>\n<p><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/www.markwilson.co.uk\/blog\/images\/dns.png?w=700&#038;ssl=1\" class=\"inline\" alt=\"Managing internal and external DNS lookups to the same resource\"\/><\/p>\n<p>Now I can seamlessly access my mail server using the same DNS name (<em>mailserver<\/em>.<em>domain<\/em>.<em>tld<\/em>) from wherever I roam to.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>When I originally set up my Active Directory, I used an internal DNS namespace, with a .local TLD (as was the advice at the time &#8211; no longer recommended). Essentially, my external domains are managed by my hosting providers and I manage the internal namespace. Simple. Then I set up a few Internet-facing resources at &hellip; <a href=\"https:\/\/www.markwilson.co.uk\/blog\/2007\/11\/managing-simultaneous-access-to-resources-from-both-internal-and-external-dns-namespaces.htm\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Managing simultaneous access to resources from both internal and external DNS namespaces<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[],"tags":[7],"class_list":["post-941","post","type-post","status-publish","format-standard","hentry","tag-dns"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Managing simultaneous access to resources from both internal and external DNS namespaces - markwilson.it<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.markwilson.co.uk\/blog\/2007\/11\/managing-simultaneous-access-to-resources-from-both-internal-and-external-dns-namespaces.htm\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Managing simultaneous access to resources from both internal and external DNS namespaces - markwilson.it\" \/>\n<meta property=\"og:description\" content=\"When I originally set up my Active Directory, I used an internal DNS namespace, with a .local TLD (as was the advice at the time &#8211; no longer recommended). 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Then I set up a few Internet-facing resources at &hellip; Continue reading Managing simultaneous access to resources from both internal and external DNS namespaces\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.markwilson.co.uk\/blog\/2007\/11\/managing-simultaneous-access-to-resources-from-both-internal-and-external-dns-namespaces.htm\" \/>\n<meta property=\"og:site_name\" content=\"markwilson.it\" \/>\n<meta property=\"article:published_time\" content=\"2007-11-13T18:25:49+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.markwilson.co.uk\/blog\/images\/dns.png\" \/>\n<meta name=\"author\" content=\"Mark Wilson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@markwilsonit\" \/>\n<meta name=\"twitter:site\" content=\"@markwilsonit\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Mark Wilson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimated reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2007\\\/11\\\/managing-simultaneous-access-to-resources-from-both-internal-and-external-dns-namespaces.htm#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2007\\\/11\\\/managing-simultaneous-access-to-resources-from-both-internal-and-external-dns-namespaces.htm\"},\"author\":{\"name\":\"Mark Wilson\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/#\\\/schema\\\/person\\\/98f61365e7c39d6be942174b8c4de468\"},\"headline\":\"Managing simultaneous access to resources from both internal and external DNS namespaces\",\"datePublished\":\"2007-11-13T18:25:49+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2007\\\/11\\\/managing-simultaneous-access-to-resources-from-both-internal-and-external-dns-namespaces.htm\"},\"wordCount\":471,\"commentCount\":1,\"publisher\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/#\\\/schema\\\/person\\\/98f61365e7c39d6be942174b8c4de468\"},\"image\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2007\\\/11\\\/managing-simultaneous-access-to-resources-from-both-internal-and-external-dns-namespaces.htm#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/images\\\/dns.png\",\"keywords\":[\"DNS\"],\"inLanguage\":\"en-GB\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2007\\\/11\\\/managing-simultaneous-access-to-resources-from-both-internal-and-external-dns-namespaces.htm#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2007\\\/11\\\/managing-simultaneous-access-to-resources-from-both-internal-and-external-dns-namespaces.htm\",\"url\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2007\\\/11\\\/managing-simultaneous-access-to-resources-from-both-internal-and-external-dns-namespaces.htm\",\"name\":\"Managing simultaneous access to resources from both internal and external DNS namespaces - 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There are still some minor\u2026","rel":"","context":"In \"Microsoft ISA Server\"","block_context":{"text":"Microsoft ISA Server","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/isa"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":543,"url":"https:\/\/www.markwilson.co.uk\/blog\/2006\/05\/migrating-smtp-e-mail-from-my-isps.htm","url_meta":{"origin":941,"position":1},"title":"Migrating SMTP e-mail from my ISP&#8217;s servers to an internally-hosted Exchange server","author":"Mark Wilson","date":"Thursday 25 May 2006","format":false,"excerpt":"Over the last couple of days, I migrated my e-mail service to Microsoft Exchange Server. I've been meaning to do this since I first bought my own domain name in the late 1990s but a lack of suitable hardware to dedicate to the task has meant that until now it's\u2026","rel":"","context":"In \"DNS\"","block_context":{"text":"DNS","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/dns"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1013,"url":"https:\/\/www.markwilson.co.uk\/blog\/2008\/03\/problems-with-hyper-v-isa-server-2006-and-tcp-offloading.htm","url_meta":{"origin":941,"position":2},"title":"Problems with Hyper-V, ISA Server 2006 and TCP offloading","author":"Mark Wilson","date":"Saturday 8 March 2008","format":false,"excerpt":"For the last few days, I've been trying to get an ISA Server 2006 installation working and it's been driving me nuts. I was pretty sure that I had my networking sorted, following Jim Harrison's article on configuring ISA Server interface settings (although a colleague did need to point out\u2026","rel":"","context":"In \"Microsoft ISA Server\"","block_context":{"text":"Microsoft ISA Server","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/isa"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":577,"url":"https:\/\/www.markwilson.co.uk\/blog\/2005\/05\/troubleshooting-dns-on-windows-server.htm","url_meta":{"origin":941,"position":3},"title":"Troubleshooting DNS on a Windows server","author":"Mark Wilson","date":"Wednesday 18 May 2005","format":false,"excerpt":"Earlier today, I blogged about some of the tools that are available for monitoring Active Directory (AD) enterprise replication and troubleshooting Windows authentication. Given that AD is so heavily reliant on the domain name system (DNS), it seems logical that I also list some of the tools available for monitoring\u2026","rel":"","context":"In \"DNS\"","block_context":{"text":"DNS","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/dns"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":237,"url":"https:\/\/www.markwilson.co.uk\/blog\/2005\/09\/10000-feet-view-of-microsoft-active.htm","url_meta":{"origin":941,"position":4},"title":"10,000 feet view of Microsoft Active Directory","author":"Mark Wilson","date":"Wednesday 14 September 2005","format":false,"excerpt":"Non-technical colleagues, and friends who work with Microsoft products but outside of a corporate environment often ask me \"what is Active Directory\" (AD). As I've blogged a few 10,000 feet views of Microsoft technologies, I thought I'd produce one for AD. At the Microsoft Technical Roadshow event last May, Paul\u2026","rel":"","context":"In \"Microsoft Active Directory\"","block_context":{"text":"Microsoft Active Directory","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/active-directory"},"img":{"alt_text":"","src":"http:\/\/www.assoc-amazon.co.uk\/e\/ir?t=marsweblo-21&l=as2&o=2&a=0954421809","width":350,"height":200},"classes":[]},{"id":2586,"url":"https:\/\/www.markwilson.co.uk\/blog\/2011\/05\/configuring-dns-for-exchange-online-in-office-365.htm","url_meta":{"origin":941,"position":5},"title":"Configuring DNS for Exchange Online in Office 365","author":"Mark Wilson","date":"Friday 13 May 2011","format":false,"excerpt":"Readers who follow me on Twitter (@markwilsonit) may have noticed that I was in a mild state of panic last night when I managed to destroy the DNS for markwilson.co.uk.\u00a0 They might also have seen this website disappear for a few hours until I managed to get things up and\u2026","rel":"","context":"In &quot;Technology&quot;","block_context":{"text":"Technology","link":"https:\/\/www.markwilson.co.uk\/blog\/topic\/technology"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/posts\/941","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/comments?post=941"}],"version-history":[{"count":0,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/posts\/941\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/media?parent=941"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/categories?post=941"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/tags?post=941"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}