Given that much detail your average tech would wait for more details.
Hi, today I faced a problem that was funny.
My ISP's default DNS is 184.108.40.206, 220.127.116.11 (OpenDNS public DNS IPs). Few days back I was able to changed the DNS to something else, like 18.104.22.168 (Google's public DNS), but right now when I try to change it, it disconnects my Internet. The interesting part is that I can still ping 22.214.171.124 with no problem.
Appreciate your help.