reply to David
Re: slight problem If you're talking about the DNS servers that are authoritative for AT&T-hosted domains, then no, no one will be able to resolve them, no matter what servers they use or what network they're on. But I get the impression that this is referring to the DNS servers that AT&T customers use by default. If it's those that are under attack, then using alternative servers will get around that.
Now if you mean that it's the root servers that are under attack, well, we wouldn't be having this conversation right now.
It was not referring to the DNS resolvers our customers use. You were correct in your first statement - only the servers that are authoritative for AT&T hosted domains were under attack. Using alternate servers would not help at all, as those servers would be unable to get replies.
That's definitely the case. Our company was crippled due to this attack. We were already in the process of migrating from AT&T's servers to another provider so we sped up that transition. Then we had to wait for the changes to propagate.
It has not been a fun 24 hours.