pii266.siyongc.domain Server: redhat52.siyongc Address: 19。DNS的名稱(chēng)記錄( 二 )。" />

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DNS的名稱(chēng)記錄( 二 )

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Default Server: redhat52.siyongc.domain
Address: 192.168.0.17
然後您輸入欲查詢(xún)的主機(jī)或IP地址您會(huì)看到從DNS回來(lái)的結(jié)果
> pii266.siyongc.domain
Server: redhat52.siyongc
Address: 192.168.0.17
Name: pii266.siyongc.domain
Address: 192.168.0.15
> www.hinet.net
Server: redhat52.siyongc.domain
Address: 192.168.0.17
Non-authoritative answer:
Name: w3c2.hinet.net
Address: 168.95.1.84
Aliases: www.hinet.net
這是一個(gè)標(biāo)準(zhǔn)模式下面的查詢(xún)我們可以看到不是這臺(tái)DNS伺服器治理的查詢(xún)而且已經(jīng)在 cache 里面了會(huì)附加一個(gè)“Non-authoritative answer:”的回應(yīng)信息 。但假如我們先將查詢(xún)模式設(shè)為any之後再輸入同樣的主機(jī)名稱(chēng)
> set q=any
> pii266.siyongc.domain
Server: redhat52.siyongc.domain
Address: 192.168.0.17
pii266.siyongc.domain preference = 20, mail exchanger = debian.home
pii266.siyongc.domain preference = 10, mail exchanger = redhat52.siyongc.domain
pii266.siyongc.domain internet address = 192.168.0.15
siyongc.domain nameserver = debian.home
siyongc.domain nameserver = redhat52.siyongc.domain
debian.home internet address = 192.168.0.2
redhat52.siyongc.domain internet address = 192.168.0.17
您就可以看到更多的資料了例如MXNS和它們的IP地址等信息 。假如您使用“除錯(cuò)模式”的話看到的資料還將更多
> set debug
> www.hinet.net
Server: redhat52.siyongc.domain
Address: 192.168.0.17
res_nmkquery(QUERY, www.hinet.net, IN, ANY)
------------
Got answer:
HEADER:
opcode = QUERY, id = 3102, rcode = NOERROR
header flags: response, want recursion, recursion avail.
questions = 1, answers = 1, authority records = 3, additional = 3
QUESTIONS:
www.hinet.net, type = ANY, class = IN
ANSWERS:
-> www.hinet.net
canonical name = w3c2.hinet.net
ttl = 76134 (21h8m54s)
AUTHORITY RECORDS:
-> hinet.net
nameserver = HNTP1.hinet.net
ttl = 162533 (1d21h8m53s)
-> hinet.net
nameserver = HNTP3.hinet.net
ttl = 162533 (1d21h8m53s)
-> hinet.net
nameserver = DNS.hinet.net
ttl = 162533 (1d21h8m53s)
ADDITIONAL RECORDS:
-> HNTP1.hinet.net
internet address = 168.95.192.1
ttl = 162533 (1d21h8m53s)
-> HNTP3.hinet.net
internet address = 168.95.192.2
ttl = 162533 (1d21h8m53s)
-> DNS.hinet.net
internet address = 168.95.1.1
ttl = 162533 (1d21h8m53s)
------------
Non-authoritative answer:
www.hinet.net
canonical name = w3c2.hinet.net
ttl = 76134 (21h8m54s)
Authoritative answers can be found from:
hinet.net
nameserver = HNTP1.hinet.net
ttl = 162533 (1d21h8m53s)
hinet.net
nameserver = HNTP3.hinet.net
ttl = 162533 (1d21h8m53s)
hinet.net
nameserver = DNS.hinet.net
ttl = 162533 (1d21h8m53s)
HNTP1.hinet.net
internet address = 168.95.192.1
ttl = 162533 (1d21h8m53s)
HNTP3.hinet.net
internet address = 168.95.192.2
ttl = 162533 (1d21h8m53s)
DNS.hinet.net
internet address = 168.95.1.1
ttl = 162533 (1d21h8m53s)
另外您還可以用 set q=mx 或 set q=ptr 等模式來(lái)查詢(xún)特定的記錄也可以用 ls 後接 domain name 來(lái)查看某個(gè) domain 的所有主機(jī)記錄 。善用 nslookup 我們可以找到許多 DNS 的信息而當(dāng)有問(wèn)題發(fā)生的時(shí)候這個(gè)工具就變得非常有用了 。
同時(shí)在設(shè)定 DNS 的時(shí)候需要比較慎密的設(shè)計(jì)以免不實(shí)資料的濫 。治理好 DNS 系統(tǒng)是每一個(gè)網(wǎng)路治理員應(yīng)盡的義務(wù)來(lái)的 。

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