dig trace 有时候只显示cname记录，有时候能显示A记录

rjamesz 发表于 2014-08-29 13:19

两次dig trace的过程，一次只显示到CNAME记录就结束了，第二次可以显示出正确的A记录，请问是什么原因造成的。结果如下：
dig @61.128.128.68 www.9you.com +trace

第一次：
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.10.rc1.el6 <<>> @61.128.128.68 www.9you.com +trace
; (1 server found)
;; global options: +cmd
.                   45688 IN    NS    m.root-servers.net.
.                   45688 IN    NS    f.root-servers.net.
.                   45688 IN    NS    i.root-servers.net.
.                   45688 IN    NS    e.root-servers.net.
.                   45688 IN    NS    c.root-servers.net.
.                   45688 IN    NS    k.root-servers.net.
.                   45688 IN    NS    d.root-servers.net.
.                   45688 IN    NS    g.root-servers.net.
.                   45688 IN    NS    l.root-servers.net.
.                   45688 IN    NS    a.root-servers.net.
.                   45688 IN    NS    j.root-servers.net.
.                   45688 IN    NS    b.root-servers.net.
.                   45688 IN    NS    h.root-servers.net.
;; Received 496 bytes from 61.128.128.68#53(61.128.128.68) in 20 ms

com.                172800IN    NS    l.gtld-servers.net.
com.                172800IN    NS    k.gtld-servers.net.
com.                172800IN    NS    c.gtld-servers.net.
com.                172800IN    NS    g.gtld-servers.net.
com.                172800IN    NS    m.gtld-servers.net.
com.                172800IN    NS    f.gtld-servers.net.
com.                172800IN    NS    b.gtld-servers.net.
com.                172800IN    NS    e.gtld-servers.net.
com.                172800IN    NS    d.gtld-servers.net.
com.                172800IN    NS    j.gtld-servers.net.
com.                172800IN    NS    a.gtld-servers.net.
com.                172800IN    NS    i.gtld-servers.net.
com.                172800IN    NS    h.gtld-servers.net.
;; Received 502 bytes from 192.58.128.30#53(192.58.128.30) in 61 ms

9you.com.             172800IN    NS    ns1.9you.com.
9you.com.             172800IN    NS    ns2.9you.com.
9you.com.             172800IN    NS    ns3.9you.com.
9you.com.             172800IN    NS    ns4.9you.com.
9you.com.             172800IN    NS    ns5.9you.com.
;; Received 200 bytes from 192.55.83.30#53(192.55.83.30) in 10207 ms

www.9you.com.       180 IN    CNAME webhtml.9you.com.fastcdn.com.
webhtml.9you.com.fastcdn.com. 142 IN CNAME xnop006.tlgslb.com.
tlgslb.com.          107548IN    NS    dns3.tlgslb.com.
tlgslb.com.          107548IN    NS    dns2.tlgslb.com.
tlgslb.com.          107548IN    NS    dns4.tlgslb.com.
tlgslb.com.          107548IN    NS    dns6.tlgslb.com.
tlgslb.com.          107548IN    NS    dns1.tlgslb.com.
tlgslb.com.          107548IN    NS    dns5.tlgslb.com.
;; Received 340 bytes from 180.153.120.65#53(180.153.120.65) in 53 ms

第二次：

; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.10.rc1.el6 <<>> @61.128.128.68 www.9you.com +trace
; (1 server found)
;; global options: +cmd
.                   45221 IN    NS    m.root-servers.net.
.                   45221 IN    NS    a.root-servers.net.
.                   45221 IN    NS    i.root-servers.net.
.                   45221 IN    NS    g.root-servers.net.
.                   45221 IN    NS    f.root-servers.net.
.                   45221 IN    NS    b.root-servers.net.
.                   45221 IN    NS    j.root-servers.net.
.                   45221 IN    NS    c.root-servers.net.
.                   45221 IN    NS    l.root-servers.net.
.                   45221 IN    NS    e.root-servers.net.
.                   45221 IN    NS    k.root-servers.net.
.                   45221 IN    NS    h.root-servers.net.
.                   45221 IN    NS    d.root-servers.net.
;; Received 496 bytes from 61.128.128.68#53(61.128.128.68) in 17 ms

com.                172800IN    NS    h.gtld-servers.net.
com.                172800IN    NS    j.gtld-servers.net.
com.                172800IN    NS    b.gtld-servers.net.
com.                172800IN    NS    k.gtld-servers.net.
com.                172800IN    NS    l.gtld-servers.net.
com.                172800IN    NS    m.gtld-servers.net.
com.                172800IN    NS    a.gtld-servers.net.
com.                172800IN    NS    d.gtld-servers.net.
com.                172800IN    NS    c.gtld-servers.net.
com.                172800IN    NS    i.gtld-servers.net.
com.                172800IN    NS    f.gtld-servers.net.
com.                172800IN    NS    g.gtld-servers.net.
com.                172800IN    NS    e.gtld-servers.net.
;; Received 502 bytes from 192.58.128.30#53(192.58.128.30) in 60 ms

9you.com.             172800IN    NS    ns1.9you.com.
9you.com.             172800IN    NS    ns2.9you.com.
9you.com.             172800IN    NS    ns3.9you.com.
9you.com.             172800IN    NS    ns4.9you.com.
9you.com.             172800IN    NS    ns5.9you.com.
;; Received 200 bytes from 192.35.51.30#53(192.35.51.30) in 13378 ms

www.9you.com.       180 IN    CNAME webhtml.9you.com.fastcdn.com.
webhtml.9you.com.fastcdn.com. 304 IN CNAME xnop006.tlgslb.com.
xnop006.tlgslb.com. 27    IN    A    222.73.164.199
xnop006.tlgslb.com. 27    IN    A    222.73.164.200
xnop006.tlgslb.com. 27    IN    A    114.80.190.55
xnop006.tlgslb.com. 27    IN    A    114.80.190.58
tlgslb.com.          103307IN    NS    dns3.tlgslb.com.
tlgslb.com.          103307IN    NS    dns2.tlgslb.com.
tlgslb.com.          103307IN    NS    dns5.tlgslb.com.
tlgslb.com.          103307IN    NS    dns4.tlgslb.com.
tlgslb.com.          103307IN    NS    dns1.tlgslb.com.
tlgslb.com.          103307IN    NS    dns6.tlgslb.com.
;; Received 404 bytes from 101.226.5.20#53(101.226.5.20) in 52 ms

睿智2012 发表于 2014-08-29 13:36

我查了多次，最后只出现了两个ip，而你的有4个啊，而且ip还与你的不一样！不知什么原因？

;; WHEN: Fri Aug 29 13:29:00 2014
;; MSG SIZErcvd: 47

. 169022 IN NS h.root-servers.net.
. 169022 IN NS g.root-servers.net.
. 169022 IN NS b.root-servers.net.
. 169022 IN NS i.root-servers.net.
. 169022 IN NS j.root-servers.net.
. 169022 IN NS f.root-servers.net.
. 169022 IN NS c.root-servers.net.
. 169022 IN NS a.root-servers.net.
. 169022 IN NS d.root-servers.net.
. 169022 IN NS m.root-servers.net.
. 169022 IN NS e.root-servers.net.
. 169022 IN NS l.root-servers.net.
. 169022 IN NS k.root-servers.net.
;; Received 496 bytes from 61.177.7.1#53(61.177.7.1) in 105 ms

com. 172800 IN NS a.gtld-servers.net.
com. 172800 IN NS b.gtld-servers.net.
com. 172800 IN NS c.gtld-servers.net.
com. 172800 IN NS d.gtld-servers.net.
com. 172800 IN NS e.gtld-servers.net.
com. 172800 IN NS f.gtld-servers.net.
com. 172800 IN NS g.gtld-servers.net.
com. 172800 IN NS h.gtld-servers.net.
com. 172800 IN NS i.gtld-servers.net.
com. 172800 IN NS j.gtld-servers.net.
com. 172800 IN NS k.gtld-servers.net.
com. 172800 IN NS l.gtld-servers.net.
com. 172800 IN NS m.gtld-servers.net.
;; Received 490 bytes from 128.63.2.53#53(h.root-servers.net) in 35473 ms

9you.com. 172800 IN NS ns1.9you.com.
9you.com. 172800 IN NS ns2.9you.com.
9you.com. 172800 IN NS ns3.9you.com.
9you.com. 172800 IN NS ns4.9you.com.
9you.com. 172800 IN NS ns5.9you.com.
;; Received 200 bytes from 192.33.14.30#53(b.gtld-servers.net) in 30050 ms

www.9you.com. 180 IN CNAME webhtml.9you.com.fastcdn.com.
webhtml.9you.com.fastcdn.com. 409 IN CNAME xnop006.tlgslb.com.
xnop006.tlgslb.com. 11 IN A 124.14.16.169
xnop006.tlgslb.com. 11 IN A 124.14.16.170
tlgslb.com. 27940 IN NS dns6.tlgslb.com.
tlgslb.com. 27940 IN NS dns4.tlgslb.com.
tlgslb.com. 27940 IN NS dns3.tlgslb.com.
tlgslb.com. 27940 IN NS dns2.tlgslb.com.
tlgslb.com. 27940 IN NS dns1.tlgslb.com.
tlgslb.com. 27940 IN NS dns5.tlgslb.com.
;; Received 244 bytes from 60.206.15.55#53(ns1.9you.com) in 30176 ms

rjamesz 发表于 2014-08-29 13:40

回复 2# 睿智2012

这个是CDN的原因，不同的地区会解析到不同的地方，所以出现ip不同正常。

睿智2012 发表于 2014-08-29 13:44

rjamesz 发表于 2014-08-29 13:40 static/image/common/back.gif
回复 2# 睿智2012

是不是智能DNS的功能啊，

智能DNS只听说过，没了解过

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Chinaunix's Archiver

dig trace 有时候只显示cname记录，有时候能显示A记录