在IPv4环境下如何访问北邮人PT？

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众所周知，身为教育网 PT 站的北邮人是无法通过公网的 IPv4 环境访问的，访问需要使用教育网 IPv6 或者是公网 IPv6，那么如果在仅有 IPv4 的环境下应该怎么访问北邮人 PT 呢？

准备环境：

  1. 一台拥有公网 IP 的 VPS，如 Vultr,Cloudcone 等
  2. 一个搭建在上述VPS上的代理服务，如 SSR,V2Ray
    修改/etc/hosts，在文件的最下面加入两行：
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2001:da8:215:4078:250:56ff:fe97:654d bt.byr.cn
2001:da8:215:4078:250:56ff:fe97:654d tracker.byr.cn

然后保存即可，使用 curl -v https://bt.byr.cn，如果返回的内容如下面所示，则说明测试成功：

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* Rebuilt URL to: https://bt.byr.cn/
*   Trying 2001:da8:215:4078:250:56ff:fe97:654d...
* TCP_NODELAY set
* Connected to bt.byr.cn (2001:da8:215:4078:250:56ff:fe97:654d) port 443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
* Cipher selection: ALL:!EXPORT:!EXPORT40:!EXPORT56:!aNULL:!LOW:!RC4:@STRENGTH
* successfully set certificate verify locations:
*   CAfile: /etc/ssl/certs/ca-certificates.crt
  CApath: /etc/ssl/certs
* TLSv1.2 (OUT), TLS header, Certificate Status (22):
* TLSv1.2 (OUT), TLS handshake, Client hello (1):
* TLSv1.2 (IN), TLS handshake, Server hello (2):
* TLSv1.2 (IN), TLS handshake, Certificate (11):
* TLSv1.2 (IN), TLS handshake, Server key exchange (12):
* TLSv1.2 (IN), TLS handshake, Server finished (14):
* TLSv1.2 (OUT), TLS handshake, Client key exchange (16):
* TLSv1.2 (OUT), TLS change cipher, Client hello (1):
* TLSv1.2 (OUT), TLS handshake, Finished (20):
* TLSv1.2 (IN), TLS change cipher, Client hello (1):
* TLSv1.2 (IN), TLS handshake, Finished (20):
* SSL connection using TLSv1.2 / ECDHE-RSA-AES256-GCM-SHA384
* ALPN, server accepted to use h2
* Server certificate:
*  subject: CN=bt.byr.cn
*  start date: Oct 21 06:00:12 2018 GMT
*  expire date: Jan 19 06:00:12 2019 GMT
*  subjectAltName: host "bt.byr.cn" matched cert's "bt.byr.cn"
*  issuer: C=US; O=Let's Encrypt; CN=Let's Encrypt Authority X3
*  SSL certificate verify ok.
* Using HTTP2, server supports multi-use
* Connection state changed (HTTP/2 confirmed)
* Copying HTTP/2 data in stream buffer to connection buffer after upgrade: len=0
* Using Stream ID: 1 (easy handle 0x563501c8d9f0)
> GET / HTTP/1.1
> Host: bt.byr.cn
> User-Agent: curl/7.52.1
> Accept: */*
> 
* Connection state changed (MAX_CONCURRENT_STREAMS updated)!
< HTTP/2 302 
< server: nginx
< date: Tue, 15 Jan 2019 04:37:03 GMT
< content-type: text/html; charset=utf-8
< x-powered-by: HHVM/3.7.0-dev
< vary: Accept-Encoding
< location: https://bt.byr.cn/login.php
< 
* Curl_http_done: called premature == 0
* Connection #0 to host bt.byr.cn left intact

此时便可以通过这台服务器上搭建的代理服务访问北邮人PT，注意请设置代理客户端为全局模式，或者将 hosts 中的两个域名加入客户端的代理列表中。