https://www.linuxidc.com/Linux/2019-05/158461.htm
1、查找域名對應的ip地址，並修改hosts文件
linuxidc@linuxidc:~/linuxidc.com$ nslookup github.global.ssl.fastly.Net
Server: 127.0.0.53
Address: 127.0.0.53#53
Non-authoritative answer:
Name: github.global.ssl.fastly.Net
Address: 151.101.229.194
linuxidc@linuxidc:~/linuxidc.com$ nslookup github.com
Server: 127.0.0.53
Address: 127.0.0.53#53
Non-authoritative answer:
Name: github.com
Address: 13.229.188.59
如下圖：
然后修改hosts文件
Windows上的hosts文件路徑在
C:\Windows\System32\drivers\etc\hosts
Linux的hosts文件路徑在/etc/hosts中
sudo vim /etc/hosts
Mac的hosts文件路徑也在/etc/hosts中
sudo vi /etc/hosts
在hosts文件末尾添加兩行
github.com 13.229.188.59
github.global.ssl.fastly.Net 151.101.229.194
2、刷新DNS緩存
Linux：
sudo /etc/init.d/networking restart
Windows：
ipconfig /flushdns
Mac：
sudo killall -HUP mDNSResponder