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domain finance.saltlake.com domain saltlake.com nameserver 204.168.12.1 nameserver 204.168.12.16 nameserver 64.58.24.1
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The domain belongs to two domains: the subdomain finance.saltlake.com, as well as the domain saltlake.com. Thus, two primary DNS servers are listed within the local domain (204.168.12.1 and 204.168.12.16). In addition, an external secondary is also listed, corresponding to ns.utahisp.com, or 64.58.24.1. Once the client resolver is configured in this way, you can use a number of tools to test whether DNS is working, and also to further examine how IP addresses are resolved.
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The most important tool for performing DNS resolutions is nslookup, which can be used in a simple command-line mode to look up FQDNs from IP addresses, and vice versa. However, nslookup also features an interactive mode that is very useful for retrieving name server characteristics for a particular domain, and to determine which DNS servers are authoritative for a specific host or network. The following is a simple example if you wanted to determine the IP address of the host www.paulwatters.com, using a client on the host provo.cassowary.net, you would use the following command:
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$ nslookup www.paulwatters.com
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The following response would be returned:
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Server: provo.cassowary.net Address: 206.68.216.16 Name: paulwatters.com Address: 209.67.50.203 Aliases: www.paulwatters.com
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This means that the primary DNS server for the local (cassowary.net) domain is provo.cassowary.net (206.68.216.16). This server then makes a connection through to the DNS server, which is authoritative for the domain paulwatters.com (dns19.hostsave.com). This server then returns the canonical (actual) name for the host (paulwatters.com), the alias name (www.paulwatters.com), and the desired IP address. If you reversed the process and instead supplied the IP address 209.67.50.203 on the command line, you would be able to perform a reverse lookup on that address, which would resolve to the domain name paulwatters.com.
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Part VI:
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If you want to verify that your DNS server is returning the correct IP address, or if you want to verify an address directly yourself, then running nslookup in interactive mode allows you to set the name of the DNS server to use for all lookups. For example, if you wanted to resolve the domain name for the Web server of the University of Sydney, you could use the following command:
$ nslookup www.usyd.edu.au
The following response would then be returned:
Server: provo.cassowary.net Address: 206.68.216.16 Name: solo.ucc.usyd.edu.au Address: 129.78.64.2 Aliases: www.usyd.edu.au
However, you could verify that this IP address is indeed correct by setting your DNS server to be the DNS server that is authoritative for the ucc.usyd.edu.au domain:
$ nslookup Default Server: provo.cassowary.net Address: 206.68.216.16
Next, enter the name of the DNS server that is authoritative for the target domain:
> server metro.ucc.su.oz.au Default Server: metro.ucc.su.oz.au Address: 129.78.64.2
Next, enter the name of the host to resolve:
> www.usyd.edu.au Server: metro.ucc.su.oz.au Address: 129.78.64.2
And the IP address is returned correctly:
Name: solo.ucc.usyd.edu.au Address: 129.78.64.24 Aliases: www.usyd.edu.au
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Domain Name Service
If you want to determine some of the key characteristics of the DNS entry for www.usyd.edu.au, such as the DNS server that is authoritative for the host, and the mail address of the administrator who is responsible for the host, it is possible to retrieve the Start of Authority (SOA) record through nslookup:
$ nslookup Default Server: provo.cassowary.net Address: 206.68.216.16 > server metro.ucc.su.oz.au Default Server: metro.ucc.su.oz.au Address: 129.78.64.2 > set q=soa > www.usyd.edu.au Server: metro.ucc.su.oz.au Address: 129.78.64.2 www.usyd.edu.au canonical name = solo.ucc.usyd.edu.au ucc.usyd.edu.au origin = metro.ucc.usyd.edu.au mail addr = root.metro.ucc.usyd.edu.au serial = 316 refresh = 3600 (1 hour) retry = 1800 (30 mins) expire = 36000 (10 hours) minimum ttl = 43200 (12 hours)
This SOA record indicates the following: The canonical name of www.usyd.edu.au is solo.ucc.usyd.edu.au. The origin of the DNS record is metro.ucc.usyd.edu.au (and this server is authoritative for the host solo.ucc.usyd.edu.au). The serial number for the current record is 316. Next time a change is made to the record, the serial number should be incremented. The refresh rate is 1 hour. The retry rate in 30 minutes. The expiry rate is 10 hours. The TTL is 12 hours. The meaning of each field is examined later in the chapter, in the Configuring a DNS Server section, which discusses how to create DNS records for the server. The use of nslookup to determine which servers are authoritative for a particular query is
Part VI:
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