$vi ..etc/named.confkey "hunan.ct" {        algorithm hmac-md5;        secret "ixF***********j6Q==";};view "hunan.ct" {        match-clients { key hunan.ct; hunan.ct; };        allow-transfer { key hunan.ct; };        server 10.10.10.21 { keys hunan.ct; };        server 10.10.10.20 { keys hunan.ct; };         zone "a.dns.com" IN {                type master;                file "zone/a.dns.com.hunan.ct";        };        zone "a.cdn.com" IN {                type master;                file "zone/a.dns.com.hunan.ct";        }; };$nsupdate -y hunan.ct:ix*************j6Q==>zone a.dns.com>server 127.0.0.1 9990>update add x147.a.dns.com 100 A 1.1.1.99  >send  #如果本来有x147 的CNAME 记录，则不会改请求被忽略>update add x147.a.dns.com 100 CNAME bb.bb>send  #如果本来有x147 的A 记录，则不会改请求被忽略
>quit

$dig @127.0.0.1 -p 9990 x147.a.dns.com -y hunan.ct:ix**********j6Q==

; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 33266
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; QUESTION SECTION:
;x147.a.dns.com. IN A

;; ANSWER SECTION:
x147.a.dns.com. 110 IN CNAME bb.bb.

;; TSIG PSEUDOSECTION:
hunan.ct. 0 ANY TSIG hmac-md5.sig-alg.reg.int. 1414034866 300 16 M**G5*******qP**vwY/A== 33266 NOERROR 0

;; Query time: 1 msec
;; SERVER: 127.0.0.1#9990(127.0.0.1)
;; WHEN: Thu Oct 23 11:27:46 2014
;; MSG SIZE rcvd: 132

:这里 110 是表示：