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Services, Directories, and Applications
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not limited to individual hosts in fact, the authoritative servers for entire networks can be determined by using nslookup. For example, if you wanted to determine which servers were authoritative for the Cook Islands top-level domain (.ck), you would use the following command:
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$ nslookup > set type=ns > ck. Server: provo.cassowary.net Address: 206.68.216.16 Non-authoritative answer: ck nameserver = DOWNSTAGE.MCS.VUW.AC.NZ ck nameserver = NS1.WAIKATO.AC.NZ ck nameserver = PARAU.OYSTER.NET.ck ck nameserver = POIPARAU.OYSTER.NET.ck ck nameserver = CIRCA.MCS.VUW.AC.NZ Authoritative answers can be found from: DOWNSTAGE.MCS.VUW.AC.NZ internet address NS1.WAIKATO.AC.NZ internet address PARAU.OYSTER.NET.ck internet address POIPARAU.OYSTER.NET.ck internet address CIRCA.MCS.VUW.AC.NZ internet address
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130.195.6.10 140.200.128.13 202.65.32.128 202.65.32.127 130.195.5.12
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Some servers that are authoritative for the top-level domain of the Cook Islands are located in New Zealand. This geographic separation may seem strange, and may not be the norm, but it makes sense if you ve ever lived through a tropical storm in Rarotonga if the power to the OYSTER.NET.ck network is disrupted, hostnames can still be resolved through the backup servers at WAIKATO.AC.NZ. It s sometimes possible to obtain a list of all the networks and hosts within a particular top-level domain by using the ls command but be warned, the output can be verbose, and security settings may prohibit you from doing this:
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$ nslookup > set type=ns > ls ck. [DOWNSTAGE.MCS.VUW.AC.NZ] ck. parau.oyster.net ck. poiparau.oyster.net ck. ck. sda.org parau.oyster.net sda.org
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server = parau.oyster.net.ck 202.65.32.128 server = poiparau.oyster.net.ck 202.65.32.127 server = downstage.mcs.vuw.ac.nz server = circa.mcs.vuw.ac.nz server = parau.oyster.net.ck 202.65.32.128 server = poiparau.oyster.net.ck
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whois
The next tool that is often useful for resolving hostnames is the whois command. This command uses InterNIC servers to perform all of the resolutions for you, and includes useful information, like the registrar of the domain name (useful when making complaints about spam or harassment on the Internet!). Here s the whois entry for paulwatters.com:
$ whois paulwatters Whois Server Version 1.3 Domain names in the .com, .net, and .org domains can now be registered with many different competing registrars. Go to http://www.internic.net for detailed information. Domain Name: PAULWATTERS.COM Registrar: REGISTER.COM, INC. Whois Server: whois.register.com Referral URL: www.register.com Name Server: DNS19.REGISTER.COM Name Server: DNS20.REGISTER.COM Updated Date: 30-may-2000
Finally, dig (domain information groper) is an application that ships with Solaris 10 that returns IP addresses from domain name queries. It returns details of many hosts on a network, as shown in the following example:
$ dig mq.edu.au ; <<>> DiG 9.1.3 <<>> mq.edu.au ANY ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 30758 ;; flags: qr rd ra; QUERY: 1, ANSWER: 6, AUTHORITY: 2, ADDITIONAL: 2 ;; QUESTION SECTION: ;mq.edu.au.
;; ANSWER SECTION: mq.edu.au. 82400 IN A 137.111.1.11 mq.edu.au. 82400 IN MX 10 sunb.ocs.mq.edu.au. mq.edu.au. 82400 IN MX 10 baldrick.ocs.mq.edu.au. mq.edu.au. 82400 IN SOA sunb.ocs.mq.edu.au. hostmaster.mq.edu.au. 2004110800 7200 1800 3600000 82400 mq.edu.au. 82400 IN NS baldrick.ocs.mq.edu.au. mq.edu.au. 82400 IN NS sunb.ocs.mq.edu.au. ;; AUTHORITY SECTION: mq.edu.au.
sunb.ocs.mq.edu.au.
Part VI:
Services, Directories, and Applications
mq.edu.au.
baldrick.ocs.mq.edu.au.
;; ADDITIONAL SECTION: sunb.ocs.mq.edu.au. 82383 baldrick.ocs.mq.edu.au. ;; ;; ;; ;;
IN 82383
A IN
137.111.1.11 A 137.111.1.12
Query time: 319 msec SERVER: 127.0.0.1#53(127.0.0.1) WHEN: Wed Nov 10 03:48:28 2004 MSG SIZE rcvd: 228
Procedures
The following procedures show how to configure a DNS server.
Configuring a DNS Server
Now that you ve examined DNS from a client viewpoint and explored concepts like SOAs, IP-to-address mapping, and address-to-IP mapping, it should be obvious what kind of services a DNS server needs to provide to clients. In addition, DNS servers need to be able to support both primary and secondary services as described earlier. BIND is the most commonly used DNS server for Solaris. It is supplied in a package that is generally installed during initial system configuration. Its main configuration file is /etc/named.conf, for BIND 8 supplied with Solaris 8. BIND 4 and earlier used a configuration file called /etc/named.boot; however, these versions are no longer supported by the ISC, and administrators running BIND 4 should upgrade to BIND 9. The /etc/named.conf file is responsible for controlling the behavior of the DNS servers and provides the following keywords, which are used to define operational statements:
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