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Local subnet priority supersedes the use of round robin rotation for multihomed com puters. When enabled, however, round robin is used as a secondary method to sort multiple records returned in a response list.
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Round Robin Example The Web server named server1.lucernepublishing.com has three network adapters and three distinct IP addresses. In the stored zone (either in a database file or in Active Directory), the three A resource records mapping the host name to each of its IP addresses appear in this fixed order:
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server1 server1 server1 IN IN IN A A A 10.0.0.1 10.0.0.2 10.0.0.3
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Configuring Advanced DNS Server Properties
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The first DNS client Client1 that queries the server to resolve this host s name receives the list in this default order. However, when a second client Client2 sends a subsequent query to resolve this name, the list is rotated as follows:
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Disabling Round Robin When you clear the Enable Round Robin check box, round robin is disabled for the DNS server. In this case, when clients query the DNS server to resolve the host name of a multihomed computer, the server always returns the match ing A resource records in the order in which those records appear in the zone.
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Secure Cache Against Pollution
By default, the Secure Cache Against Pollution option is enabled. This setting allows the DNS server to protect its cache against referrals that are potentially polluting or nonsecure. When the setting is enabled, the server caches only those records with a name that corresponds to the domain for which the original queried name was made. Any referrals received from another DNS server along with a query response are simply discarded. For example, if a query is originally made for example.microsoft.com, and a referral answer provides a record for a name outside the microsoft.com domain name tree (such as msn.com), that name is discarded if the Secure Cache Against Pollution option is enabled. This setting helps prevent unauthorized computers from impersonating another network server. When this option is disabled, however, the server caches all the records received in response to DNS queries even when the records do not correspond to the queried-for domain name.
Name Checking
By default, the Name Checking drop-down list box on the Advanced tab of the DNS server properties dialog box is set to Multibyte (UTF8). Thus, the DNS service by default verifies that all domain names handled by the DNS service conform to the Uni code Transformation Format (UTF). Unicode is a 2-byte encoding scheme, compatible with the traditional 1-byte US-ASCII format, that allows for binary representation of most languages.
5-50
5
Implementing a DNS Infrastructure
Figure 5-28 shows the four name-checking methods you can select from the Name Checking drop-down list box, and each is described in Table 5-3.
Figure 5-28 Table 5-3
Name-checking methods
Name-Checking Methods
Description Uses strict checking of names. These restrictions, set in Request for Comments
(RFC) 1123, include limiting names to uppercase and lowercase letters (A Z, a
z), numbers (0 9), and hyphens (-). The first character of the DNS name can be
a number.
Permits names that are nonstandard and that do not follow RFC 1123 Internet
host naming specifications.
Permits recognition of characters other than ASCII, including Unicode, which is
normally encoded as more than one octet (8 bits) in length.
With this option, multibyte characters can be transformed and represented using
UTF-8 support, which is provided with Windows Server 2003.
Names encoded in UTF-8 format must not exceed the size limits clarified in RFC
2181, which specifies a maximum of 63 octets per label and 255 octets per
name. Character count is insufficient to determine size because some UTF-8
characters exceed one octet in length. This option allows for domain names
using non-English alphabets.
Permits any naming conventions.
Method Strict RFC (ANSI)
Non RFC (ANSI) Multibyte (UTF8)
All Names
Despite the flexibility of the UTF-8 name-checking method, you should consider changing the Name Checking option to Strict RFC when your DNS servers perform zone transfers to non-Windows servers that are not UTF-8 aware. Although DNS server implementations that are not UTF-8 aware might be able to accept the transfer of a
Lesson 3
Configuring Advanced DNS Server Properties
5-51
zone containing UTF-8 encoded names, these servers might not be able to write back those names to a zone file or reload those names from a zone file. You should use the other two Name Checking options, Non RFC and All Names, only when a specific application requires them.
Load Zone Data On Startup
By default, the Load Zone Data On Startup drop-down list box is set to the From Active Directory And Registry option. Thus, by default DNS servers in Windows Server 2003 ini tialize with the settings specified in the Active Directory database and the server Registry. However, this setting includes two other options, From Registry and From File, as shown in Figure 5-29.
Figure 5-29
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