DNS的名称记录

　2008-04-09 16:31:22　来源：WEB开发网　　　

核心提示：验DNS工作当您建立好一个DNS伺服器之後除了可以直接使用命令 ping (这个会在後面章节说明)直接ping一下上面的记录之外最好还是使用“nslookup”这个命令进行检测或除错(Windows9x系统并不包含此命令)，下面让我们在Linux中验一下当您输入nslookup之後您会看到您机

验DNS工作

当您建立好一个DNS伺服器之後除了可以直接使用命令 ping (这个会在後面章节说明)直接ping一下上面的记录之外最好还是使用“nslookup”这个命令进行检测或除错(Windows9x系统并不包含此命令)。下面让我们在Linux中验一下当您输入nslookup之後您会看到您机器目前指定的DNS伺服器的回应

Default Server: redhat52.siyongc.domain Address: 192.168.0.17

然後您输入欲查询的主机或IP地址您会看到从DNS回来的结果

> 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

这是一个标准模式下面的查询我们可以看到不是这台DNS伺服器管理的查询而且已经在 cache 里面了会附加一个“Non-authoritative answer:”的回应信息。但如果我们先将查询模式设为any之後再输入同样的主机名称

> 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资料了例如MXNS和它们的IP地址等信息。假如您使用“除错模式”的话看到的资料还将更多

> 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)