一、linux
[root@nfs-node2 ~]# vim /etc/resolv.conf
; generated by /sbin/dhclient-script
search hosts.com
domain hosts.com
nameserver 10.32.101.11
nameserver 10.32.101.12
nameserver 223.5.5.5
options timeout:1 attempts:1 rotate #超时时间、重试次数、轮训
二、windows
略
三、常用工具介绍
1、host
语法
host(选项)(参数)
选项
-a：显示详细的DNS信息；
-c<类型>：指定查询类型，默认值为“IN“；
-C：查询指定主机的完整的SOA记录；
-r：在查询域名时，不使用递归的查询方式；
-t<类型>：指定查询的域名信息类型；
-v：显示指令执行的详细信息；
-w：如果域名服务器没有给出应答信息，则总是等待，直到域名服务器给出应答；
-W<时间>：指定域名查询的最长时间，如果在指定时间内域名服务器没有给出应答信息，则退出指令；
-4：使用IPv4；
-6：使用IPv6.
实例：
[root@nfs-node2 ~]# host www.baidu.com
www.baidu.com is an alias for www.a.shifen.com.
www.a.shifen.com has address 61.135.169.121
www.a.shifen.com has address 61.135.169.125
[root@nfs-node2 ~]# host www.baidu.com 114.114.114.114 #指定dns
Using domain server:
Name: 114.114.114.114
Address: 114.114.114.114#53
Aliases:
www.baidu.com is an alias for www.a.shifen.com.
www.a.shifen.com has address 61.135.169.125
www.a.shifen.com has address 61.135.169.121
2、dig
实例：
[root@nfs-node2 ~]# dig www.baidu.com
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.62.rc1.el6_9.5 <<>> www.baidu.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 2509
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 5, ADDITIONAL: 5
;; QUESTION SECTION:
;www.baidu.com. IN A
;; ANSWER SECTION:
www.baidu.com. 366 IN CNAME www.a.shifen.com.
www.a.shifen.com. 126 IN A 61.135.169.121
www.a.shifen.com. 126 IN A 61.135.169.125
;; AUTHORITY SECTION:
a.shifen.com. 524 IN NS ns5.a.shifen.com.
a.shifen.com. 524 IN NS ns4.a.shifen.com.
a.shifen.com. 524 IN NS ns2.a.shifen.com.
a.shifen.com. 524 IN NS ns1.a.shifen.com.
a.shifen.com. 524 IN NS ns3.a.shifen.com.
;; ADDITIONAL SECTION:
ns1.a.shifen.com. 55 IN A 61.135.165.224
ns2.a.shifen.com. 274 IN A 180.149.133.241
ns3.a.shifen.com. 274 IN A 61.135.162.215
ns4.a.shifen.com. 274 IN A 115.239.210.176
ns5.a.shifen.com. 197 IN A 119.75.222.17
;; Query time: 4 msec
;; SERVER: 202.106.0.20#53(202.106.0.20)
;; WHEN: Wed May 30 18:12:41 2018
;; MSG SIZE rcvd: 260
[root@nfs-node2 ~]# dig www.baidu.com @8.8.8.8 #指定dns
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.62.rc1.el6_9.5 <<>> www.baidu.com @8.8.8.8
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 35120
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;www.baidu.com. IN A
;; ANSWER SECTION:
www.baidu.com. 616 IN CNAME www.a.shifen.com.
www.a.shifen.com. 299 IN A 61.135.169.125
www.a.shifen.com. 299 IN A 61.135.169.121
;; Query time: 101 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Wed May 30 18:12:49 2018
;; MSG SIZE rcvd: 90
3、nslookup
实例：
[root@nfs-node2 ~]# nslookup www.baidu.com
Server: 202.106.0.20
Address: 202.106.0.20#53
Non-authoritative answer:
www.baidu.com canonical name = www.a.shifen.com.
Name: www.a.shifen.com
Address: 61.135.169.121
Name: www.a.shifen.com
Address: 61.135.169.125
[root@nfs-node2 ~]# nslookup www.baidu.com 223.5.5.5 #指定dns
Server: 223.5.5.5
Address: 223.5.5.5#53
Non-authoritative answer:
www.baidu.com canonical name = www.a.shifen.com.
Name: www.a.shifen.com
Address: 61.135.169.121
Name: www.a.shifen.com
Address: 61.135.169.125