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.Next, include the local host identifier, which is used for loopback testing, the name and address of any mail servers, and finally any host name aliases.A host name alias is used to provide a host (such as my server SRV) with more than one host name.This is particularly useful when you want your WWW site to be accessible in the commonly used format WWW.DomainName.COM (www.nt-guru.com, for example) rather than ServerName.DomainName.COM (srv.nt-guru.com, for example).Note: When you specify a fully qualified domain name (FQDN), it must be appended with a period.Otherwise, the domain name is appended to the host name for resolution and causes the name query to fail.Suppose that I specified my domain name as nt-guru.com in line 7 of Listing 5.4 instead of nt-guru.com., for example.Then when trying to resolve the host name srv.nt-guru.com, the domain name of nt-guru.com would be appended once again (srv.nt-guru.com.nt-guru.com).Because there is no host by that name, the query would fail.ARPA-###.REVThis file is used for reverse lookups of host names within a domain.Instead of resolving a name to an IP address, a reverse lookup resolves an IP address to a host name.Listing 5.5, for example, shows the reverse lookup file for my domain, which only has one subnet (128.0).Listing 5.5.An example reverse lookup file for a small subnet.@ IN SOA srv.nt-guru.com.admin.srv.nt-guru.com.( ;source host e-mailaddr1 ; serial number of file10800 ; refresh interval3600 ; retry interval604800 ; expiration interval86400 ) ; minimum time to live@ IN NS srv.nt-guru.com.; name server for domain@ IN NBSTAT nt-guru.com.; domain name to append for NBSTAT lookups1 IN PTR srv.nt-guru.com.; SRV at 128.199 IN PTR winbookxp5.nt-guru.com.; WinBook XP5 at 128.99Once more, the first record should be an SOA record.The next record lists the name (or DNS) server for the domain, followed by an NBSTAT record, and then the individual PTR records for each host in the domain.Table 5.5 lists these records and their use.Many people find the PTR records most confusing.Instead of supplying a complete IP address (such as 128.1) for the host, you only supply the last digit of the IP address (such as 1), followed by the fully qualified host name (host + domain name +.).Table 5.5.Supported reverse lookup records.IdentifierRecord TypeDescriptionNBSTATNBSTATSpecifies the domain name to append to any host name found by an NBSTAT lookupNSName ServerSpecifies the DNS servers in the domainPTRPointerSpecifies an IP address for a hostSOAStart of AuthorityThe first record in any configuration file; specifies a nameSummaryThis chapter focused on implementing the DHCP, WINS, and DNS services on your network.You learned about the design goals for the services, basic planning issues, and the management options available for manipulating your DHCP and WINS clients.You also looked at specific issues for using DHCP and WINS in a mixed Windows NT and UNIX environment.You also examined how to prepare for the possibility of a failure with the services database, some Registry keys you can use to configure otherwise unconfigurable options, and some basic performance tips.In the next chapter, you will look at some of the security issues involved with connecting to the Internet and how you can configure your server to minimize unauthorized access to your network
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