今天遇到了一个非常奇怪的问题。
我有一台 Ubuntu Server 20.04，并且可以连接互联网。
curl -I https://ubuntu.com
HTTP/2 200
server: nginx/1.14.0 (Ubuntu)
date: Sat, 17 Oct 2020 21:36:00 GMT
content-type: text/html; charset=utf-8
content-length: 117744
vary: Accept-Encoding
strict-transport-security: max-age=15724800
cache-control: max-age=61, stale-while-revalidate=90
x-view-name: canonicalwebteam.templatefinder.templatefinder.template_finder
x-vcs-revision: 1602851262-3ba0a85
x-request-id: 6375631a0ecfec34db764bd1749c47f0
link: <https://assets.ubuntu.com>; rel=preconnect; crossorigin, <https://assets.ubuntu.com>; rel=preconnect, <https://res.cloudinary.com>; rel=preconnect
x-cache-status: HIT from content-cache-gs2/1
accept-ranges: bytes
当我尝试连接到 github.com 时没有任何反应。
curl -I https://github.com
curl: (28) Failed to connect to github.com port 443: Connection timed out
wget、lynx 有同样的问题。
但是我可以 ping github.com
ping github.com
PING github.com (140.82.121.3) 56(84) bytes of data.
64 bytes from lb-140-82-121-3-fra.github.com (140.82.121.3): icmp_seq=1 ttl=50 time=21.9 ms
或者跟踪路由
traceroute github.com
traceroute to github.com (140.82.121.4), 30 hops max, 60 byte packets
1 router.xxxxx.xxx (xx.xx.xx.xx) 0.242 ms 0.238 ms 0.255 ms
2 81-223-31-89.static.upcbusiness.at (81.223.31.89) 2.113 ms 3.889 ms 4.722 ms
3 * * *
4 80-241-21-149.static.upcbusiness.at (80.241.21.149) 18.085 ms 18.261 ms 22.063 ms
5 at-vie05d-rc1-ae-31-2048.aorta.net (84.116.228.149) 19.252 ms 22.501 ms 23.460 ms
6 at-vie05b-ri3-ae-12-0.aorta.net (213.46.173.125) 21.620 ms 9.418 ms 13.507 ms
7 ae6.cr1-vie2.ip4.gtt.net (46.33.84.85) 15.221 ms 16.084 ms 16.096 ms
8 et-2-0-13.cr2-fra6.ip4.gtt.net (89.149.185.22) 29.695 ms 25.821 ms 29.583 ms
9 87.119.94.70 (87.119.94.70) 34.992 ms 29.015 ms 28.827 ms
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有人知道哪里出了问题吗？
答案1
我找到原因了。原因是 IP 地址重复。一旦我更改了 IP 地址，一切就都正常了。