I would assume the bank may have provided her with more specific information than it was some NASA network, including the date. Furthermore, the person making the complaint pretty much knew who it was (and that person subsequently admitted it). This isn't about tracking down a random person at NASA.
If Comcast can tell you which customer had a given IP address at a given time, I’m sure NASA can figure out that a given IP address was the one used for ISS traffic.
"Anne McClain acknowledges accessing the account from the ISS but denies any wrongdoing, the New York Times reports."
It is overwhelmingly likely that she was the only person with access to both a NASA computer and the account credentials.
If it happened during the time that Anne McClain was on the ISS, and she was the only person within NASA with credentials to this account, it seems like a plausible conclusion that she accessed the it from space.
it's plausible but it's not true/factual (imagine a bank that didn't expire credentials, somebody broke into her computer at work and logged in there, etc, etc). However, she did apparently admit she did this. I was just hoping the article had a line line, "and NASA verified the IP was coming from space" or something like that. Otherwise, it's circumstantial.
The article says she admitted to doing it, so there’s that.
That's incomplete, though- NASA has terrestrial computers
That's why it's an investigation, not a conviction.