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为什么用dig +trace 可以查到A记录,不加trace就查不到A记录?ping的话也ping不通,nslookup也查不到记录
dig mail.deltaww.com.cn a +trace
; <<>> DiG 9.4.3-P1 <<>> mail.deltaww.com.cn a +trace
;; global options: printcmd
. 156024 IN NS H.ROOT-SERVERS.NET.
. 156024 IN NS G.ROOT-SERVERS.NET.
. 156024 IN NS J.ROOT-SERVERS.NET.
. 156024 IN NS L.ROOT-SERVERS.NET.
. 156024 IN NS B.ROOT-SERVERS.NET.
. 156024 IN NS K.ROOT-SERVERS.NET.
. 156024 IN NS A.ROOT-SERVERS.NET.
. 156024 IN NS C.ROOT-SERVERS.NET.
. 156024 IN NS E.ROOT-SERVERS.NET.
. 156024 IN NS F.ROOT-SERVERS.NET.
. 156024 IN NS I.ROOT-SERVERS.NET.
. 156024 IN NS D.ROOT-SERVERS.NET.
. 156024 IN NS M.ROOT-SERVERS.NET.
;; Received 288 bytes from 127.0.0.1#53(127.0.0.1) in 0 ms
cn. 172800 IN NS a.dns.cn.
cn. 172800 IN NS b.dns.cn.
cn. 172800 IN NS c.dns.cn.
cn. 172800 IN NS d.dns.cn.
cn. 172800 IN NS e.dns.cn.
cn. 172800 IN NS ns.cernet.net.
;; Received 302 bytes from 128.63.2.53#53(H.ROOT-SERVERS.NET) in 247 ms
deltaww.com.cn. 21600 IN NS ns1.dgnet.net.
deltaww.com.cn. 21600 IN NS ns2.dgnet.net.
;; Received 82 bytes from 203.119.25.1#53(a.dns.cn) in 38 ms
mail.deltaww.com.cn. 86400 IN A 59.37.19.30
deltaww.com.cn. 86400 IN NS ns1.dgnet.net.
deltaww.com.cn. 86400 IN NS ns2.dgnet.net.
;; Received 130 bytes from 61.142.15.14#53(ns1.dgnet.net) in 30 ms
$ dig mail.deltaww.com.cn a
; <<>> DiG 9.4.3-P1 <<>> mail.deltaww.com.cn a
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 2510
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUESTION SECTION:
;mail.deltaww.com.cn. IN A
;; AUTHORITY SECTION:
deltaww.com.cn. 634 IN SOA dgnet.net. root.dgnet.net. 2009122306 7200 3600 1814400 86400
;; Query time: 0 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Thu Dec 24 16:51:25 2009
;; MSG SIZE rcvd: 87 |
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