DNS absolutely was an issue. I changed DNS manually from Cloudflare's 1.0.0.1 (which is what DHCP was giving me) to 8.8.8.8 (Google) and most things I'm trying to reach work. There may be other failures going on as well, but 1.0.0.1 was completely unreachable.
No, I changed the setting back and forth while it was down to confirm that the issue was that I could not reach 1.0.0.1. All the entries I tried from my host file were responsive (which is how I ruled out an issue with my local equipment initially and confirmed that it wasn't a complete failure upstream -- I could still reach my servers). Changing 1.0.0.1 to 8.8.8.8 allowed me to reach websites like Google and HN, and changing back to default DNS settings (which reset to 1.0.0.1, confirmed in Wireshark) resulted in the immediate return of failures. 1.0.0.1 was not responsive to anything else I tried.
Again, it may not have been the only issue -- and there are a number of possible reasons why 1.0.0.1 wasn't reachable -- but it certainly was an issue.
> I don't use cloudflare DNS but google DNS and got the same problems thant everyone else
Cloudflare is also the authoritative DNS server for many services. If Cloudflare is down, then for those services Google's DNS has nowhere to get the authoritative answers from.
