正向区域
SUB_ZONE_NAME IN NS NSSERVER_SUB_ZONE_NAME

NSSERVER_SUB_ZONE_NAME IN A IP

.com

xingxing.com.

xingxing.com. IN NS ns1.xingxing.com.
IN NS ns2.xingxing.com.
ns1.xingxing.com. IN A 172.16.100.1
ns2.xingxing.com. IN A 172.16.100.2

dig -t A www.baidu.com @172.16.100.1

两台子域//配置主从
fin.xingxing.com. IN NS ns1.fin.xingxing.com.
fin.xingxing.com. IN NS ns2.fin.xingxing.com.
ns1.fin.xingxing.com. IN A 172.16.100.8
ns2.fin.xingxing.com. IN A 172.16.100.88

makert.xingxing.com. IN NS ns1.makert.xingxing.com.
ns1.makert.xingxing.com. IN A 172.16.100.9

配置步骤如下：
1- 在主DNS服务器中vi /var/named/xingxing.com.zone授权子域
vi /var/named/xingxing.com.zone
增加如下四行信息 增加两个子域fin.xingxing.com. market.xingxing.com.
in IN NS ns1.fin
ns1.fin IN A 192.168.1.3
market IN NS ns1.market
ns1.market IN A 192.168.1.33
2- 子域服务器配置
vi /etc/resolve.conf
//增加两行
nameserver 127.0.0.1
search fin.xingxing.com
网卡dns配置为本机子域的ip192.168.1.3
3- 安装bind 、bind-utils。
配置vi /var/named.rfc1912.conf
增加子域信息
zone "fin.xingxing.com" IN {
type master;
file "fin.xingxing.com.zone";
};
创建并配置fin.xingxing.com.zone文件注意文件权限
vi /var/named/fin.xingxing.com.zone
$TTL 86400
@ IN SOA ns1.fin.xingxing.com. root (
3 ; serial
1D ; refresh
1H ; retry
1W ; expire
3H ) ; minimum
@ IN NS ns1.fin.xingxing.com.
@ IN MX 5 mail.fin.xingxing.com.
ns1 IN A 192.168.1.3
mail IN A 192.168.1.3
smtp IN A 192.168.1.3
pop3 IN A 192.168.1.3
pop IN A 192.168.1.3

4- 测试解析
//测试NS记录
dig -t NS fin.xingxing.com @192.168.1.3

; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.47.rc1.el6_8.1 <<>> -t NS fin.xingxing.com @192.168.1.3
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 5409
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; QUESTION SECTION:
;fin.xingxing.com. IN NS

;; ANSWER SECTION:
fin.xingxing.com. 86400 IN NS ns1.fin.xingxing.com.

;; ADDITIONAL SECTION:
ns1.fin.xingxing.com. 86400 IN A 192.168.1.3

;; Query time: 1 msec
;; SERVER: 192.168.1.3#53(192.168.1.3)
;; WHEN: Sat Oct 15 19:03:15 2016
;; MSG SIZE rcvd: 68

//测试A记录
dig -t A mail.fin.xingxing.com @192.168.1.3

; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.47.rc1.el6_8.1 <<>> -t A mail.fin.xingxing.com @192.168.1.3
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 9231
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1

;; QUESTION SECTION:
;mail.fin.xingxing.com. IN A

;; ANSWER SECTION:
mail.fin.xingxing.com. 86400 IN A 192.168.1.3

;; AUTHORITY SECTION:
fin.xingxing.com. 86400 IN NS ns1.fin.xingxing.com.

;; ADDITIONAL SECTION:
ns1.fin.xingxing.com. 86400 IN A 192.168.1.3

;; Query time: 1 msec
;; SERVER: 192.168.1.3#53(192.168.1.3)
;; WHEN: Sat Oct 15 19:04:13 2016
;; MSG SIZE rcvd: 89

配置转发
vi /etc/named.conf
forward first; //only 只找192.168.1.5 first 先找192.168.1.5，如果解析不了就找根
forwarders { 192.168.1.5; };
配置转发域指对配置的域就行转发
vi /etc/named.conf
zone "xingxing.com" IN {
type forward;
forward first;
forwarders { 192.168.1.5; };
};

测试记录
[root@nagios named]# dig +trace -t A www.baidu.com

; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.47.rc1.el6_8.1 <<>> +trace -t A www.baidu.com
;; global options: +cmd
. 518218 IN NS f.root-servers.net.
. 518218 IN NS g.root-servers.net.
. 518218 IN NS a.root-servers.net.
. 518218 IN NS b.root-servers.net.
. 518218 IN NS i.root-servers.net.
. 518218 IN NS d.root-servers.net.
. 518218 IN NS m.root-servers.net.
. 518218 IN NS h.root-servers.net.
. 518218 IN NS c.root-servers.net.
. 518218 IN NS e.root-servers.net.
. 518218 IN NS j.root-servers.net.
. 518218 IN NS l.root-servers.net.
. 518218 IN NS k.root-servers.net.
;; Received 228 bytes from 127.0.0.1#53(127.0.0.1) in 3532 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 491 bytes from 198.41.0.4#53(198.41.0.4) in 6009 ms

baidu.com. 172800 IN NS dns.baidu.com.
baidu.com. 172800 IN NS ns2.baidu.com.
baidu.com. 172800 IN NS ns3.baidu.com.
baidu.com. 172800 IN NS ns4.baidu.com.
baidu.com. 172800 IN NS ns7.baidu.com.
;; Received 201 bytes from 192.41.162.30#53(192.41.162.30) in 473 ms

www.baidu.com. 1200 IN CNAME www.a.shifen.com.
a.shifen.com. 1200 IN NS ns4.a.shifen.com.
a.shifen.com. 1200 IN NS ns1.a.shifen.com.
a.shifen.com. 1200 IN NS ns2.a.shifen.com.
a.shifen.com. 1200 IN NS ns5.a.shifen.com.
a.shifen.com. 1200 IN NS ns3.a.shifen.com.
;; Received 228 bytes from 220.181.37.10#53(220.181.37.10) in 7 ms

DNS子域授权与转发配置