Archivo de Zona @ IN SOA phloem.uoregon.edu. hostmaster.phloem.uoregon.edu. ( 1999060900 ; Serial number (yyyymmddnn) 7200 ; Refresh /* 2 hours */ 900 ; Retry /* 15 minutes */ 604800 ; Expire /* 7 days */ 86400 ; Minimum TTL /* 1 day */ )
@ IN NS phloem.uoregon.edu. @ IN NS ruminant.uoregon.edu. @ IN NS dns.cs.uoregon.edu. @ IN NS arizona.edu. @ IN TXT "LOC: Lat 44.02.781 Lon 123.04.699"
cs IN NS phloem.uoregon.edu. cs IN NS dns.cs.uoregon.edu.
www.physics IN CNAME zebu.uoregon.edu. ftp 3600 IN CNAME sap.uoregon.edu. cisco2-gw IN CNAME cisco2-gw.cs.uoregon.edu. irs.sch IN CNAME irs.osshe.edu.
localhost IN A 127.0.0.1
uoregon.edu. IN MX 0 network-services.uoregon.edu.
Archivo de Zona (cont.) cisco1-gw IN A 128.223.2.1 IN A 128.223.3.1 IN A 128.223.30.1
alpha 0 IN A 128.223.142.106 0 IN A 128.223.142.113
zebu IN A 128.223.21.25 IN MX 0 zebu.uoregon.edu.
pagelabmac IN A 128.223.20.121 IN HINFO Mac OpenTransport IN TXT "Ethernet: 00059A20C5BB" IN TXT "DL: 10000" IN TXT "LOC: 381 Klamath" IN TXT "CON: Grace Ann Neff, 346-4652"
$origin sch.uoregon.edu. opal IN A 128.223.28.19
$ORIGIN rrp.net. inet IN A 128.223.56.241 $ORIGIN uoregon.edu.
BIND Berkeley Internet Name Domain Quizas la implementación más popular de DNS. Mantenida por http://www.isc.org Utiliza los archivos antes mencionado y un archivo de inicialización/configuración del sistema (named.conf)
El Archivo de Configuración de BIND v8 options { directory "/etc/named"; allow-transfer { 128.223.21.15; }; fake-iquery yes; };
zone "." { type hint; file "named.root"; };
zone "uoregon.edu" { type master; file "uo.zone"; };
zone "223.128.in-addr.arpa" { type master; file "uo.rev"; };
zone "0.0.127.in-addr.arpa" { type master; file "named.local"; };
zone "rrp.net" { type master; file "uo.zone"; };
zone "cs.uoregon.edu" { type slave; file "cs.uoregon.edu"; masters { 128.223.6.9; }; };
zone "bethel.k12.or.us" { type slave; file "bethel.k12.or.us"; masters { 163.41.16.10; }; };
NSLOOKUP Ahora que tenemos todo configurado, podemos poner a funcionar nuestro DNS. Un utilitario de mucha ayuda para ver si todo está funcionando correctamente es nslookup. Nslookup es un cliente de DNS. Podemos utilizarlos para hacer preguntas sobre registros específicos de determinadas estaciones.
NSLOOKUP (Ejemplo) [jad@phloem:/etc] 23% nslookup Default Server: phloem.uoregon.edu Address: 128.223.32.35
> alien Server: phloem.uoregon.edu Address: 128.223.32.35
alien.uoregon.edu preference = 0, mail exchanger = network-services.uoregon.edu alien.uoregon.edu internet address = 128.223.60.70 uoregon.edu nameserver = phloem.uoregon.edu uoregon.edu nameserver = ruminant.uoregon.edu uoregon.edu nameserver = dns.cs.uoregon.edu uoregon.edu nameserver = arizona.edu network-services.uoregon.edu internet address = 128.223.60.21 phloem.uoregon.edu internet address = 128.223.32.35 ruminant.uoregon.edu internet address = 128.223.21.15 dns.cs.uoregon.edu internet address = 128.223.6.9 arizona.edu internet address = 128.196.128.233
NSLOOKUP (Ejemplo) [jad@phloem:/etc] 23% nslookup Default Server: phloem.uoregon.edu Address: 128.223.32.35
> set type=ptr > 128.223.60.70 Server: phloem.uoregon.edu Address: 128.223.32.35
70.60.223.128.in-addr.arpa name = alien.uoregon.edu 223.128.in-addr.arpa nameserver = phloem.uoregon.edu 223.128.in-addr.arpa nameserver = ruminant.uoregon.edu 223.128.in-addr.arpa nameserver = dns.cs.uoregon.edu 223.128.in-addr.arpa nameserver = arizona.edu phloem.uoregon.edu internet address = 128.223.32.35 ruminant.uoregon.edu internet address = 128.223.21.15 dns.cs.uoregon.edu internet address = 128.223.6.9 arizona.edu internet address = 128.196.128.233
Referencias DNS and BIND. Paul Albitz. Tcp/IP Network Administración. Craig Hunt. Managing IP Networks with Cisco Routers. Scott M. Ballew. http://www.cis.ohio-state.edu/hypertext/information/rfc.html RFC-1035 DNS Implementation RFC-1591 DNS Structure & Delegation RFC-2182 Selection and Operation of Secondary DNS Servers RFC-2535 DNS Security Extensions
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