Back in the day when we had InterNAP transit, I can attest that they were filtered at _least_ by prefix, by mostly all of the folks who they acquired transit from. On Tue, 29 Apr 2003, Richard A Steenbergen wrote:
On Tue, Apr 29, 2003 at 05:04:28PM -0500, Jack Bates wrote:
InterNAP. They are large enough that their transits usually don't filter them, yet they have had several problems in the past with their customers and not validating the information they've been given. It's even possible that InterNAP is filtering but took Thorn's word for it. I'm unfamiliar with 12124's history.
Inap is filtered by almost every one of their transits, both manually and with IRR entries. In fact, cleaning up all the IRR entry mess created by proxy registered routes from inap and their transits can be a full time job.
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