遇到一个奇怪的问题， dns 劫持？

[ksc010]

今天突然发现机房的服务器（电线专线）不能解析部分域名

xx@xxx:~$ nslookup coloyou.m.tmall.com 223.5.5.5
Server:         223.5.5.5
Address:        223.5.5.5#53

** server can't find coloyou.m.tmall.com: SERVFAIL

而其他域名正常

nslookup www.m.tmall.com 223.5.5.5
Server:         223.5.5.5
Address:        223.5.5.5#53

Non-authoritative answer:
www.m.tmall.com canonical name = sh.wagbridge.m.tmall.com.
sh.wagbridge.m.tmall.com        canonical name = sh.wagbridge.tmall.com.
sh.wagbridge.tmall.com  canonical name = sh.wagbridge.tmall.com.gds.alibabadns.com.
Name:   sh.wagbridge.tmall.com.gds.alibabadns.com
Address: 106.11.95.1

外面的服务器也没问题

root@bbb:~# nslookup coloyou.m.tmall.com 223.5.5.5
Server:         223.5.5.5
Address:        223.5.5.5#53

Non-authoritative answer:
coloyou.m.tmall.com     canonical name = sh.wagbridge.m.tmall.com.
sh.wagbridge.m.tmall.com        canonical name = sh.wagbridge.tmall.com.
sh.wagbridge.tmall.com  canonical name = sh.wagbridge.tmall.com.gds.alibabadns.com.
Name:   sh.wagbridge.tmall.com.
Address: 106.11.95.8

[ksc010]

另外机房的服务器 使用其他 dns 解析这几个域名也不行

nslookup coloyou.m.tmall.com
Server: 114.114.114.114
Address: 114.114.114.114#53

** server can't find coloyou.m.tmall.com: SERVFAIL

[BSD]

dig +trace 试试看， linux 下谁还用什么 nslookup 。。。。

[ksc010]

@BSD dig 可以，但是 ping 不行；这是为啥。。。

ping coloyou.m.tmall.com
ping: unknown host coloyou.m.tmall.com

dig coloyou.m.tmall.com

; <<>> DiG 9.10.3-P4-Ubuntu <<>> coloyou.m.tmall.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 56457
;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;coloyou.m.tmall.com. IN A

;; ANSWER SECTION:
coloyou.m.tmall.com. 284 IN CNAME sh.wagbridge.m.tmall.com.
sh.wagbridge.m.tmall.com. 284 IN CNAME sh.wagbridge.tmall.com.
sh.wagbridge.tmall.com. 284 IN CNAME sh.wagbridge.tmall.com.gds.alibabadns.com.
sh.wagbridge.tmall.com.gds.alibabadns.com. 97 IN A 106.11.95.5

;; Query time: 23 msec
;; SERVER: 114.114.114.114#53(114.114.114.114)
;; WHEN: Sat Dec 03 23:33:34 CST 2016
;; MSG SIZE rcvd: 170