命令行：
（1）广州：
[root@mini-server ~]# dig +tracewww.baidu.com ;; global options: +cmd . 465900 IN NS a.root-servers.net. . 465900 IN NS g.root-servers.net. . 465900 IN NS l.root-servers.net. . 465900 IN NS k.root-servers.net. . 465900 IN NS h.root-servers.net. . 465900 IN NS d.root-servers.net. . 465900 IN NS j.root-servers.net. . 465900 IN NS f.root-servers.net. . 465900 IN NS m.root-servers.net. . 465900 IN NS b.root-servers.net. . 465900 IN NS i.root-servers.net. . 465900 IN NS e.root-servers.net. . 465900 IN NS c.root-servers.net. ;; Received 228 bytes from210.21.4.130#53(210.21.4.130) in 3 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. com. 86400 IN DS 30909 8 2E2D3C916F6DEEAC73294E8268FB5885044A833FC5459588F4A9184CF C41A5766 com. 86400 IN RRSIG DS 8 1 8640020230607050000 20230525040000 60955 . WNuq6QEHbwjZ8nShV1Ps+hRjszcN/UwjTwZ/FgfpCDdcA+NVVMAuNYDd4HiG7SByy1wJKjCQWs3eak+TK7vFfQ8Lsq2gu9TvgHB24Z11S0xYWbK+Ag0YVeluwfgFztBQ/eUfvQ5JvQeXf2OBMgnuS/8lfYKxVUdebVPu3gL3T+xlX4IkTG1x5W1nRKaf5dbw56WBMXr9HI2NF+rTTl7S9tHBJv9LzbivqXhDQl/CWEqKKaTVNtjRXPPxm4RsSaC/HmidBi/ZO3dFxqU8ZlLnK97ZgKwixdVdX0NQlTLZBuVyHW5vHhdtCfaXDo40X51UpPEktzYAmjzTq78a ydECFA== ;; Received 1173 bytes from198.41.0.4#53(a.root-servers.net) in 173 ms ;; connection timed out; no servers couldbe reached
（2）xiang gang：
[root@VM-16-5-centos ~]# dig +tracewww.baidu.com ;; global options: +cmd . 518332 IN NS i.root-servers.net. . 518332 IN NS b.root-servers.net. . 518332 IN NS j.root-servers.net. . 518332 IN NS e.root-servers.net. . 518332 IN NS a.root-servers.net. . 518332 IN NS f.root-servers.net. . 518332 IN NS m.root-servers.net. . 518332 IN NS l.root-servers.net. . 518332 IN NS c.root-servers.net. . 518332 IN NS h.root-servers.net. . 518332 IN NS d.root-servers.net. . 518332 IN NS k.root-servers.net. . 518332 IN NS g.root-servers.net. . 518332 IN RRSIG NS 8 0 51840020230607050000 20230525040000 60955 . CiXPyAdGbnsMH6njOtdrlAA3GZqc0qnZFQoRKJ8Rjh15XDr5Gk9Dehw4ZTR16qFcMg+kHT1m4eDLWLyM5nQ0wOZMClGvU4t8b7F/IbahH6N6JmWbJJ7ypklxYdWLcKwKr//IkjL2jio2SPxaBi7CzXqtWhXvVOHoxSYTM8wEgWsmYXczBZpAjxiFU67EbN+aAQ58gUGtR5fPKUeqCddmcgMFLUVtIbtdqpRnXhnXlUjaarILTrCFmZZgnvfICKPLEysW5v5LDpA+dxJ9qmbKzXPpFADoKH/AWUFjX3hktPbLWRnQNzfz6Y0LNCeS77MiVORddoSKVeznVlZ8 CWoheg== ;; Received 1125 bytes from172.19.16.5#53(172.19.16.5) in 0 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. com. 86400 IN DS 30909 8 2E2D3C916F6DEEAC73294E8268FB5885044A833FC5459588F4A9184CF C41A5766 com. 86400 IN RRSIG DS 8 1 8640020230607050000 20230525040000 60955 . WNuq6QEHbwjZ8nShV1Ps+hRjszcN/UwjTwZ/FgfpCDdcA+NVVMAuNYDd4HiG7SByy1wJKjCQWs3eak+TK7vFfQ8Lsq2gu9TvgHB24Z11S0xYWbK+Ag0YVeluwfgFztBQ/eUfvQ5JvQeXf2OBMgnuS/8lfYKxVUdebVPu3gL3T+xlX4IkTG1x5W1nRKaf5dbw56WBMXr9HI2NF+rTTl7S9tHBJv9LzbivqXhDQl/CWEqKKaTVNtjRXPPxm4RsSaC/HmidBi/ZO3dFxqU8ZlLnK97ZgKwixdVdX0NQlTLZBuVyHW5vHhdtCfaXDo40X51UpPEktzYAmjzTq78a ydECFA== ;; Received 1173 bytes from198.41.0.4#53(a.root-servers.net) in 37 ms 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 ns1.baidu.com. baidu.com. 172800 IN NS ns7.baidu.com. CK0POJMG874LJREF7EFN8430QVIT8BSM.com. 86400IN NSEC3 1 1 0 - CK0Q2D6NI4I7EQH8NA30NS61O48UL8G5 NS SOA RRSIG DNSKEYNSEC3PARAM CK0POJMG874LJREF7EFN8430QVIT8BSM.com. 86400IN RRSIG NSEC3 8 2 86400 20230530042512 20230523031512 46551 com.CbS4eFmUaIVbYRWneACYMHE8bzEddDlNdNZg23ca8daf9WU9o7EtyAljUfbdM1X2sLuzyPmy1yAV+bFBvxb7YuqQik3RLXHiLHFzFtxDOhtRjlbN1VpFEnaFqx00Y6mNphV9rLv98UnYZeOVMv3LdOO5xty2pTlp/Orwt4uPakKnclsQojvTojZwXDa30qQ9YDB3SNiEWZph0besh05cWA== HPVV0C47Q7CQMTAJM90K1FBFJBRP4B4D.com. 86400IN NSEC3 1 1 0 - HPVVAN8CFKHHHMEIDVJHFNQEOI5G6C89 NS DS RRSIG HPVV0C47Q7CQMTAJM90K1FBFJBRP4B4D.com. 86400IN RRSIG NSEC3 8 2 86400 20230529062815 20230522051815 46551 com.MA5p8JeFomYue62Ws7jSdFSl/RECSrE7VyOGRTSCGa4TDbd9QF9tIMroCi3F5M6jokF7dLHjskHk1UiO36g8CXghuhU9ZzOL1PBJKzlVUuO04wZU7fkwTzMxX608xXLDGtVgH+Uy/NcQGjiNKQeKueeGz5MFF3Yiz5Wr6hHvsaEMIhM6zqyAyDeNxWKwPeOvrx5xf0Rrina0b2Gchd7E/g== ;; Received 849 bytes from192.43.172.30#53(i.gtld-servers.net) in 38 ms www.baidu.com. 1200 IN CNAME www.a.shifen.com. ;; Received 100 bytes from112.80.248.64#53(ns3.baidu.com) in 41 ms
有图：
（1）xiang gang：
（2）广州：
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发表于 2023-5-25 16:02:50
幸亏早有准备