dig查看路由dns，+trace回显
dig @119.29.29.29 www.baidu.com +tracedig @119.29.29.29 www.baidu.com +trace
; <<>> DiG 9.10.2-P2 <<>> @119.29.29.29 www.baidu.com +trace
; (1 server found)
;; global options: +cmd
. 346206IN NS e.root-servers.net.
. 346206IN NS g.root-servers.net.
. 346206IN NS f.root-servers.net.
. 346206IN NS l.root-servers.net.
. 346206IN NS m.root-servers.net.
. 346206IN NS j.root-servers.net.
. 346206IN NS i.root-servers.net.
. 346206IN NS d.root-servers.net.
. 346206IN NS b.root-servers.net.
. 346206IN NS k.root-servers.net.
. 346206IN NS a.root-servers.net.
. 346206IN NS h.root-servers.net.
. 346206IN NS c.root-servers.net.
;; Received 239 bytes from 119.29.29.29#53(119.29.29.29) in 26 ms
com. 172800IN NS a.gtld-servers.net.
com. 172800IN NS b.gtld-servers.net.
com. 172800IN NS c.gtld-servers.net.
com. 172800IN NS d.gtld-servers.net.
com. 172800IN NS e.gtld-servers.net.
com. 172800IN NS f.gtld-servers.net.
com. 172800IN NS g.gtld-servers.net.
com. 172800IN NS h.gtld-servers.net.
com. 172800IN NS i.gtld-servers.net.
com. 172800IN NS j.gtld-servers.net.
com. 172800IN NS k.gtld-servers.net.
com. 172800IN NS l.gtld-servers.net.
com. 172800IN NS m.gtld-servers.net.
com. 86400 IN DS 30909 8 2 E2D3C916F6DEEAC73294E8
268FB5885044A833FC5459588F4A9184CF C41A5766
com. 86400 IN RRSIG DS 8 1 86400 20170527050000 2017
0514040000 14796 . HUqOkyMfS8iY0288BHiQIAqxM68DqOjtLXAyj4SWQJUTmnyKPuFDycGT TiTn
36VsjK8rhN4Khz32Tk/5nxgzT2kLeQG01WpkoHEsxM6VBxdluOz5 yquez81YdydLblKpkWVD5xpfs2D
MDO/uxXL0yZjC37w0xmOIfVIq7DNH wNte+1JOg7L/b9FA/2tz+3thz/2FD5RaoOuLLY6wT9XtpwkIbf
iKyn5D r8XCFqukrmZhWTLL6R+67fIlFuRf5stBJBE6wr87cIf6Sn5AeX4BEBiT Zg3iezeOd80nwHPS
8fK/dNUoRh0L6AqehztyKPqnP7tO2LE1CrsKqMmi 3LCZCA==
;; Received 865 bytes from 199.7.83.42#53(l.root-servers.net) in 291 ms
baidu.com. 172800IN NS dns.baidu.com.
baidu.com. 172800IN NS ns2.baidu.com.
baidu.com. 172800IN NS ns3.baidu.com.
baidu.com. 172800IN NS ns4.baidu.com.
baidu.com. 172800IN NS ns7.baidu.com.
CK0POJMG874LJREF7EFN8430QVIT8BSM.com. 86400 IN NSEC3 1 1 0 - CK0Q1GIN43N1ARRC9OS
M6QPQR81H5M9A NS SOA RRSIG DNSKEY NSEC3PARAM
CK0POJMG874LJREF7EFN8430QVIT8BSM.com. 86400 IN RRSIG NSEC3 8 2 86400 20170521044
901 20170514033901 27302 com. PGnWspD537YYWmwQsy5bhLQCVxBAguTa6VN0GLVOa5M+bT7T1t
pI7J0b P38OcqLcxDJ4hZP86C8MUxZkD+h0B9bj4XBT27NkZuIDyh6YKMCrF/zO GBjSl+kbkkdKb+BR
EtEHtlUDJCiM2tMWmWz6JcQlfXsCCQOiQnPJplMe bw8=
HPVV2B5N85O7HJJRB7690IB5UVF9O9UA.com. 86400 IN NSEC3 1 1 0 - HQ01I3PFSK4TG3Q31LT
3RIMHGBFQU42T NS DS RRSIG
HPVV2B5N85O7HJJRB7690IB5UVF9O9UA.com. 86400 IN RRSIG NSEC3 8 2 86400 20170519045
014 20170512034014 27302 com. hDjGw7j/EUOqAa2A5xQM8qoVzzozxz42NBhiGUyl0zsrsit3H6
Kwrqq6 bSiyX4O8FXW7pbwlVyXeVSctYVG2HfhOTigzVUmuLdaETkx3mGlIWqpz ZJlmwTmm5wGqrhdg
sUJYk0iyUgqOzfdxpbo6hYaSCgdDUSgFq761hpIZ HKc=
;; Received 697 bytes from 192.26.92.30#53(c.gtld-servers.net) in 83 ms
www.baidu.com. 1200 IN CNAME www.a.shifen.com.
a.shifen.com. 1200 IN NS ns2.a.shifen.com.
a.shifen.com. 1200 IN NS ns4.a.shifen.com.
a.shifen.com. 1200 IN NS ns5.a.shifen.com.
a.shifen.com. 1200 IN NS ns1.a.shifen.com.
a.shifen.com. 1200 IN NS ns3.a.shifen.com.
;; Received 239 bytes from 220.181.37.10#53(ns3.baidu.com) in 50 ms
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