vb.net generate data matrix code Figure 4-7 Creating resource records in .NET

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Figure 4-7 Creating resource records
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To add a resource record to a zone, complete the following steps: 1. Open the DNS console. 2. In the console tree, right-click the applicable zone and select Other New Records. The Resource Record Type dialog box appears. 3. In the Select A Resource Record Type list box, select the type of resource record you want to add. 4. Click Create Record. 5. In the New Resource Record dialog box, enter the information needed to com plete the resource record. 6. After you specify all of the necessary information for the resource record, click OK to add the new record to the zone. 7. Click Done to return to the DNS console.
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Resource Record Format
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Resource records appear in varying formats, depending on the context in which they are used. For example, when lookups and responses are made using DNS, resource records are represented in binary form in packets. In the DNS console, resource records are represented graphically so that they can be viewed and modified easily. However, at the source in the zone database files resource records are represented as text entries. In fact, by creating resource records in the DNS console, you are auto matically adding text entries to the corresponding zone s database file.
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Lesson 3
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Deploying DNS Servers
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4-33
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In these zone files, resource records have the following syntax:
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Owner TTL Class Type RDATA
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Table 4-3 describes each of these fields.
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Table 4-3
Typical Resource Record Fields
Description The name of the host or the DNS domain to which this resource record belongs. A 32-bit integer that represents, in seconds, the length of time that a DNS server or client should cache this entry before it is discarded. This field is optional, and if it is not specified, the client uses the minimum TTL in the SOA record. The field that defines the protocol family in use. For Windows DNS servers, the resource record is always of the class Internet, abbreviated IN. This field is optional and is not automatically generated. The field that identifies the type of resource record, such as A or SRV. The resource record data. It is a variable-length field that represents the infor mation being described by the resource record type. For example, in an A resource record, this is the 32-bit IP address that represents the host identified by the owner.
Name Owner Time To Live
Class
Type RDATA
Most resource records are represented as single-line text entries. If an entry is going to span more than one line, parentheses can encapsulate the information. In many imple mentations of DNS, only the SOA resource record can contain multiple lines. For readability, blank lines and comments ignored by the DNS server are often inserted in the zone files. Comments always start with a semicolon (;) and end with a carriage return.
Record Types
The most common resource records you need to create manually include the following:
Host (A) Alias (CNAME) Mail exchanger (MX) Pointer (PTR) Service location (SRV)
Host (A) Resource Records Host (A) resource records make up the majority of resource records in a zone database. These records are used in a zone to associate DNS
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4
Configuring DNS Servers and Clients
domain names of computers (or hosts) to their IP addresses. They can be added to a zone in different ways:
You can manually create an A resource record for a static TCP/IP client computer by using the DNS console or the Dnscmd support tool at the command line. Computers running Windows 2000, Windows XP, or Windows Server 2003 use the DHCP Client service to dynamically register and update their own A resource records in DNS when an IP configuration change occurs. Dynamic Host Configuration Protocol (DHCP) enabled client computers running earlier versions of Microsoft operating systems can have their A resource records registered and updated by proxy if they obtain their IP lease from a qualified DHCP server. (Only the DHCP service provided with Windows Server 2003 cur rently supports this feature.)
Once created in the DNS console, an A resource record that maps the host name server1.lucernepublishing.com to the IP address 172.16.48.1 is represented textually within the lucernepublishing.com.dns zone file as follows:
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