create qr barcode c# Part 6: Managing Windows Server 2003 Networking and Print Services in C#.NET

Generator QR in C#.NET Part 6: Managing Windows Server 2003 Networking and Print Services

Part 6: Managing Windows Server 2003 Networking and Print Services
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Microsoft Windows Server 2003 Inside Out Here, the version information is in the last two lines of the comments. If you changed the root hints file, you must stop and then start the DNS Server service so that the root hints file is reloaded. In the DNS console, you can do this by right-clicking the server entry, pointing to All Tasks, and selecting Restart. On a DNS server that uses Active Directory integrated zones, the root hints are read from Active Directory and the Registry at startup. You can view and modify the root hints in the DNS console. To do this, right-click the DNS server entry and then select Properties. In the Properties dialog box, select the Root Hints tab. You can then manage each of the individual root hint entries using Add, Edit, or Remove as necessary. To update the entire root hints using a known good DNS server, click Copy From Server, type the IP address of the DNS server, and then click OK. If you suspect the root hints file is corrupted, see Microsoft Knowledge Base article 249868 for details on reloading the file into Active Directory using the %SystemRoot%\System32\DNS\Cache.dns file.
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Part 6: Managing Windows Server 2003 Networking and Print Services
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Consider whether external root servers should be used In some instances, you might not want to use a root hint file, or you might want to bypass using root servers. Here are two scenarios to consider: If your organization isn t connected to the Internet, your name servers don t need pointers to the public root servers. Instead, you should remove the entries in the Cache.dns file and replace them with NS and A records for the DNS server authoritative for the root domain at your site. For example, if you use a private top-level domain, such as .local, you must set up a root name server for the .local domain, and the Cache.dns file should point to these root name servers. You must then restart the DNS Server service so that the root hints file is reloaded. In the DNS console, you can do this by right-clicking the server entry, pointing to All Tasks, and selecting Restart. Making a connection to the root name servers exposes your internal name servers. The internal name server must connect through your organization s firewall to the root name server. While this connection is open and your name server is waiting for a response, there is a potential vulnerability that could be exploited. Here, someone could have set up a fake name server that is waiting for such connections and then could use this server to perform malicious activity on your DNS servers. To prevent this, you can configure forwarding to specific external name servers and tell your name servers not to use the root name servers. You do this by configuring the Do Not Use Recursion For This Domain option when you set up forwarding. For more information, see the section entitled Configuring Forwarders and Conditional Forwarding on page 893.
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Part 6: Managing Windows Server 2003 Networking and Print Services
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After you complete your initial planning, you should consider an overall design architecture. There are two primary DNS designs used:
Split-brain design Separate-name design
Most DNS implementations are architected to use a split-brain design. What this means is that your organization uses the same domain name internally as it does externally, and DNS is designed so that the name services for your organization s internal network are separate from that used for the organization s external network. Put another way, an organization s private network should be private and separate from its presence on the public Internet, so your internal name servers should be separate from your external name servers. You don t want a situation in which you have one set of name servers and they are used for both users within the organization and users outside the organization. That s a security no-no that could open your internal network to attack. The concern with this design and this is why it is called split-brain is that if your internal network uses the same domain namespace as that of your public Internet presence, you can get in a situation in which users within the organization can t look up information related to the organization s public Internet presence and users outside the organization can t look up information for the organization s private network. From an internal user perspective, it is a bad thing that users can t access the organization s public Internet resources. There s an easy fix, however. You simply create records on the authoritative name server for the internal network that specifies the IP address for the organization s public Internet resources. For example, to allow users on the internal cpandl.com domain to access www.cpandl.com on the public Internet, you create a host record on the internal DNS server for www in the cpandl.com domain that specifies its IP address. From a security perspective, it is a good thing that outside users can t look up information for the organization s private network you don t want them to be able to do this. If you have business partners at other locations that need access to the internal network, you should set up a secure link between your organizations or make other arrangements, such as using an extranet. To implement split-brain design, you should do the following:
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