MCSE Planning a Windows Server 2003 Network Infrastructure in Software

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MCSE Planning a Windows Server 2003 Network Infrastructure
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The exam is hot on security, so it s likely that you ll be asked how you can secure your DNS installation Make sure you are aware of why DNS security is important (as just covered) and how you can ensure its security There are a number of specific concerns relating to security that you need to be aware of:
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Security of the DNS resolving process Controlling how your internal clients and your public clients on the Internet resolve addresses within your domain or domains Security of the DNS server Preventing malicious attacks on your server and preventing users from accessing or updating information that they shouldn t have access to Zone security Ensuring DNS zone information is not updated from dynamic clients or the database corrupted in the process Client security Your clients should be talking to the right server
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I ll cover each of these concerns in the next sections
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Security When Resolving Addresses
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When designing a DNS system, you need to be able to resolve internal addresses and external addresses and also, if necessary, publish your public presence on the Internet Obviously, the moment you include the Internet in your equation, you need to think about the security, not only in terms of preventing or restricting your internal clients from accessing the Internet, but also to prevent external users from accessing areas of your network that you do not want them to access There are four scenarios involving the different combinations of internal resolving, external (Internet) resolving from the internal network, and the publicizing of your public presence on the Internet We ll look at each combination and its recommended solution next
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You may be asked to suggest one of the alternatives in this section based on the requirements of the network
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Internal Resolving Only If your clients only need to resolve names within the internal network with no resolving of Internet names, then you should disable
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CHAPTER 3 Planning a Host Resolution Strategy
all forwarding and configure your server to handle the resolving for the root and top-level domains Internal and External Resolving (No Public Presence) With internal clients that need to communicate with the Internet for resolving purposes but do not have an Internet presence, you can use forwarding on your DNS servers to send the requests to your ISP, as shown in Figure 38 For more secure access, another alternative is use a proxy service, such as Microsoft s Internet Security and Acceleration (ISA) server, as shown in Figure 39 The ISA server or servers can be configured to resolve Internet addresses, so while the clients continue to talk to the DNS servers to resolve internal addresses, they can talk to the proxy server to resolve Internet addresses for web browsing Internal Resolving with Public Presence If you have internal resolving requirements and have a public presence on the Internet but don t need to resolve Internet addresses, the easiest method is to completely separate your internal and external DNS servers The internal server handles all internal traffic, while the public server handles the serving of your Internet domain and presence You can see this in action in Figure 310
FIGURE 38
Using forwarding from an internal DNS server for queries
FIGURE 39
Using a proxy server for communication with the Internet
MCSE Planning a Windows Server 2003 Network Infrastructure
FIGURE 310
Using separate internal/external DNS servers
In this situation in Figure 310, there is no communication between the internal and external servers However, the same principles of an internal-only DNS server apply: you must configure your internal server to host the top-level and root domains Internal and External Resolving with Public Presence There are a number of different solutions to choose from if you want an internal DNS server, an Internet presence, and the ability to resolve Internet addresses on your internal network Most rely on a combination of the solutions we ve already discussed We recommend one of the following three solutions:
Split the DNS namespace between external (public) machines and internal (private) machines For example, with the public domain mydomaincom, your public presence would remain within mydomaincom, but your internal servers would be within the internalmydomaincom subdomain Split the DNS service between internal and external DNS servers The external servers not only publicize your presence and allow public clients to access your network, but also resolve requests for your internal clients This is similar to the non-public presence solution, with the addition that your internal servers forward their requests to the external DNS servers for resolving public addresses, as shown in Figure 311 The same solution could use a proxy server, as demonstrated in Figure 39, for Internet browsing Split the DNS, but use a firewall that only allows the internal and external DNS servers to communicate by opening UDP and TCP port 53 between the two DNS servers
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