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Securing the cache against pollution helps to prevent spoofed DNS records from polluting the cache. This is an important setting on external DNS servers and I even recommend it for internal DNS servers. Securing your DNS servers from cache pollution is Read More...
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As with any standard, there are specifications on what is allowed and what is not allowed. DNS is a standard and as such has certain restrictions on DNS names. When creating a DNS name, you should be aware of these limitations to prevent any problems Read More...
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We all know DNS is important to web browsing, Active Directory and so much more. However, I am often receive emails asking questions about DNS issues and the answers almost always lead back to how DNS lookups work. Understanding how DNS resolves names Read More...
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Windows DNS is pretty straightforward to install and setup, but occasionally issues occur that require investigation. By enabling DNS debug logging, you can log all DNS related actions such as zone transfers, DNS queries and resource record updates. Configuring Read More...
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NSLookup is a powerful troubleshooting tool that administrators can use to determine DNS related problems. I am often asked about errors that occur when using NSLookup. Seeing as troubleshooting the troubleshooting tool will only extend the time it takes Read More...
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DNS is a hierarchical naming system. A DNS name includes the names of all of the DNS namespaces that it belongs to. The DNS namespace is made up of a number of components. The DNS namespace starts with a root domain. The root domain is a logical domain Read More...
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There are a variety of differnt DNS Resource Records. What are they and when do you use one or the other? Keep reading! When working with Active Directory there are certain record types you need to be familiar with. Start of Authority (SOA) records are Read More...
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Maintenance, its boring, repetitive, and often forgotten. The old adage "If it ain't broke, don't fix it" is followed by too many administrators but preventitive maintenance can help you discover minor problems and allow you to fix them before they snowball Read More...
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When using Windows 2003 and Exchange 2003, there is an issue that can occur when you attempt to resolve certain Domain Name System (DNS) query responses through a firewall. When DNS queries are passed through a firewall they are inspected (this depends Read More...
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Windows 2003 introduced a new type of DNS zone called a Stub Zone. A Stub Zone is a zone that it obtains its resource records from other name servers. A stub zone is like a secondary zone, however it is read-only so administrators can't manually add, Read More...
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Sender Policy Framework (SPF) is a type of DNS record created to help stop Spam. A lot of anti-spam filters include a filter to look for SPF records and if they are forged, block the messages. The easiest way to describe SPF is to call it a reverse MX Read More...
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Split DNS! What is it and when should you use it? Split DNS is a method of splitting (duh!) your DNS zone when you use the same domain name for your internal and external domains. In an unsplit DNS setup, you have a single DNS zone for domain.com. All Read More...
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One of the few services in Windows Server 2003 that can be completly managed by the command line is the DNS Server service. The DNS Server service can be installed, configured, managed, repaired and removed all using a set of command line tools included Read More...
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Windows Server 2003 DNS includes a new feature called conditional forwarders. Conditional forwarders are used to forward queries for a specific domain name to a set of DNS servers for that domain. Normally a DNS server forwards all queries it cannot resolve Read More...
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Reverse DNS records, aka PTR records, are used when you have an IP address you need to resolve to a name. While it is not 100% necessary to create a reverse lookup zone in your Active Directory domain this is a popular error. Event Type: Warning Event Read More...
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Another very common DNS issue is the inability to resolve external names. This problem is more common in Windows 2000 Active Directory domains, but it can happen in Windows 2003 AD domains as well. The usual culprit is the formation of a root zone (.) Read More...
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In my last DNS tip, DNS Tips #2 , I talked a bit about how Active Directory relies on DNS to function properly. DNS servers must provide support for Service Location (SRV) resource records to specify the location of services. SRV records are used to map Read More...
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Microsoft Windows 2000/XP and 2003 will register the A and PTR records in the forward and reverse lookup zones on the DNS SOA automatically. If you are running AD-Integrated DNS servers, any of these servers can update the records. On a AD Windows workstation Read More...
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Microsoft's Active Directory needs DNS in order to perform properly. If you have ever had DNS issues in an AD domain you will know what I am talking about! Here are a few I see ALL the time. An organization has an Active Directory domain called joesdomain.com Read More...
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