use kaggle for testing, if we can connect to it we are good for 12 hours.
the campus network allows dns query, might allow dns port based proxies.
use dig for DNS avaliability check.
dig baidu.com
dns proxies:
https://0day.work/tunneling-all-traffic-over-dns-with-a-socks-proxy/
https://serverfault.com/questions/962961/socks-proxy-over-dns