Ricky is on multiple advisory boards for vendors, customers and cyber security industry bodies and periodically works with leading analyst firms to help device strategy and advise on cyber security.
Ricky Magalhaes is a seasoned cyber security strategist, architect and cyber expert, Ricky has trained government agencies and a myriad of governmental agencies on various information security disciplines and has speaks at national and international embassies, conferences on behalf of cyber software vendors. Your email address will not be published. Learn about the latest security threats, system optimization tricks, and the hottest new technologies in the industry.
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Windows DNS dependency. Securing your single point of failure. DNS and firewalls. Server preparation. Standard configuration Please make sure that all of the Windows updates are done and the latest drivers and Rom packs have been loaded on the server and applied to the hardware this is essential as you do not want to be applying these changes at a later stage when the machine goes into production. Summary In this article I covered important stages of DNS installation and basic recommendations relating to security and architecture.
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The DNS Namespace Planning Domain and Zones IP Addressing Binary Addressing Address Classes Classless Internet Domain Routing Using an Alternate Configuration Subnetting Shortcuts DHCP Scopes Authorizing; Client Reservations Using Superscopes Option Classes Troubleshooting DHCP Verify Database Integrity Resolving a Host Name Recursive and Iterative Queries Reverse Queries DNS Server Roles Manage DNS Zones Stub Zones DNS Server Options Creating a Reverse Lookup Zone Resource Records DNS Forwarders Implementing Dynamic DNS Upgrading a Zone Aging and Scavenging Monitoring and Management In practical terms, it means that clients can update their own DNS Server records automatically, thus reducing the administrative load.
Before you install DNS on a production network you need to answer a whole series of questions. For example Will your DNS name match our email domain?
Who will be in charge of DNS, you or must you rely on a Unix department? First, click the New button and type the name of the domain you want your name server to conditionally forward to:. Click OK and the new domain appears in the top listbox make sure it is selected for the next step :.
Now type the IP address of your conditional forwarder into the dotted box and click Add to add it to the selected domain's forwarders list:. Click OK to apply the change and close the properties sheet and you're done. Now any name queries for the google. When might you want to use conditional forwarding in the real world? I can think of several situations where it might be useful:. Finally, is there anything you need to watch out for regarding using conditional forwarding? Two things come to mind First, conditional forwarding is suitable if you are dealing with a fixed DNS infrastructure.
That means in a merger or supply-chain scenario you must be sure the other company doesn't plan on changing their DNS infrastructure by decommissioning old name servers, deploying new ones, or changing the IP addresses of existing ones.
If they do change their infrastructure and don't inform you of this, then your name server may suddenly find itself forwarding queries to non-existing name servers resulting in failed name queries and frustrated users flooding help desk with calls. In that case, it might be better to create stub zones on your name servers for zones for which the other company's name servers are authoritative.
That's because stub zones automatically update themselves with the current list of name servers in the zone while configuring forwarders is a process that has to be done manually. Same thing in a large enterprise that has a complex Active Directory forest--if you aren't sure that administrators in other divisions of your company are going to tell you in advance when they change their DNS infrastructures, don't implement conditional forwarding--use stub zones instead.
The second caveat concerning conditional forwarding is not to get to carried away implementing it.
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