dnstracer用于获取给定主机名从给定域名服务器（DNS）的信息，并跟随DNS服务器链得到权威结果。
工具来源：http://www.mavetju.org/unix/general.php
dnstracer主页 | Kali dnstracer Repo仓库
dnstracer - 跟踪到源的DNS查询工具
root@kali:~# dnstracer DNSTRACER version 1.8.1 - (c) Edwin Groothuis - http://www.mavetju.org 用法: dnstracer [选项] [主机名] -c: 禁用本地缓存,默认启用 -C: 启用负缓存，默认禁用 -o: 启用返回结果的概述，默认禁用 -q <querytype>: DNS请求查询类型，默认为A -r <retries>: DNS请求的重试次数，默认值3 -s <server>: 使用此服务器的初始请求，默认localhost，如果指定将使用A.ROOT-SERVERS.NET -t <maximum timeout>: 限制每次尝试等待的时间 -v: 显示详细 -S <ip address>: 使用这个IP作为源地址 -4: 不查询IPv6服务器
root@kali:~# dnstracer -q mx -r 1 -t 10 -v www.harvard.edu Tracing to www.harvard.edu[#mx] via 192.168.219.2, maximum of 1 retries 192.168.219.2 (192.168.219.2) IP HEADER - Destination address: 192.168.219.2 DNS HEADER (send) - Identifier: 0x351F - Flags: 0x00 (Q ) - Opcode: 0 (Standard query) - Return code: 0 (No error) - Number questions: 1 - Number answer RR: 0 - Number authority RR: 0 - Number additional RR: 0 QUESTIONS (send) - Queryname: (3)www(7)harvard(3)edu - Type: 15 (unknown) - Class: 1 (Internet) DNS HEADER (recv) - Identifier: 0x351F - Flags: 0x8080 (R RA ) - Opcode: 0 (Standard query) - Return code: 0 (No error) - Number questions: 1 - Number answer RR: 1 - Number authority RR: 5 - Number additional RR: 4 QUESTIONS (recv) - Queryname: (3)www(7)harvard(3)edu - Type: 15 (unknown) - Class: 1 (Internet) ANSWER RR - Domainname: (3)www(7)harvard(3)edu - Type: 5 (CNAME) - Class: 1 (Internet) - TTL: 5 (5s) - Resource length: 36 - Resource data: (3)www(7)harvard(3)edu(3)cdn(10)cloudflare(3)net AUTHORITY RR - Domainname: (10)cloudflare(3)net - Type: 2 (NS) - Class: 1 (Internet) - TTL: 5 (5s) - Resource length: 6 - Resource data: (3)ns3(10)cloudflare(3)net AUTHORITY RR - Domainname: (10)cloudflare(3)net - Type: 2 (NS) - Class: 1 (Internet) - TTL: 5 (5s) - Resource length: 6 - Resource data: (3)ns2(10)cloudflare(3)net AUTHORITY RR - Domainname: (10)cloudflare(3)net - Type: 2 (NS) - Class: 1 (Internet) - TTL: 5 (5s) - Resource length: 6 - Resource data: (3)ns1(10)cloudflare(3)net AUTHORITY RR - Domainname: (10)cloudflare(3)net - Type: 2 (NS) - Class: 1 (Internet) - TTL: 5 (5s) - Resource length: 6 - Resource data: (3)ns5(10)cloudflare(3)net AUTHORITY RR - Domainname: (10)cloudflare(3)net - Type: 2 (NS) - Class: 1 (Internet) - TTL: 5 (5s) - Resource length: 6 - Resource data: (3)ns4(10)cloudflare(3)net ADDITIONAL RR - Domainname: (3)ns3(10)cloudflare(3)net - Type: 28 (unknown) - Class: 1 (Internet) - TTL: 5 (5s) - Resource length: 16 - Resource data: 2400:cb00:2049:0001:0000:0000:c629:de1f ADDITIONAL RR - Domainname: (3)ns3(10)cloudflare(3)net - Type: 1 (A) - Class: 1 (Internet) - TTL: 5 (5s) - Resource length: 4 - Resource data: 198.41.222.31 ADDITIONAL RR - Domainname: (3)ns2(10)cloudflare(3)net - Type: 28 (unknown) - Class: 1 (Internet) - TTL: 5 (5s) - Resource length: 16 - Resource data: 2400:cb00:2049:0001:0000:0000:c629:de83 ADDITIONAL RR - Domainname: (3)ns2(10)cloudflare(3)net - Type: 1 (A) - Class: 1 (Internet) - TTL: 5 (5s) - Resource length: 4 - Resource data: 198.41.222.131 Got answer [received type is cname] |/___ ns3.cloudflare.net [cloudflare.net] (2400:cb00:2049:0001:0000:0000:c629:de1f) IP HEADER - Destination address: XXX DNS HEADER (send) - Identifier: 0x303A - Flags: 0x00 (Q ) - Opcode: 0 (Standard query) - Return code: 0 (No error) - Number questions: 1 - Number answer RR: 0 - Number authority RR: 0 - Number additional RR: 0 QUESTIONS (send) - Queryname: (3)www(7)harvard(3)edu - Type: 15 (unknown) - Class: 1 (Internet) send_data/sendto: Network is unreachable
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