BCP38 is hard, was TWC (AS11351) blocking all NTP?

John R. Levine johnl at iecc.com
Tue Feb 4 23:24:22 UTC 2014

> If ISP has customer A with multiple *known* valid networks --doesn't matter 
> if ISP allocated them to customer or not-- and ISP lets them all out, but 
> filters everything else, ISP is still complying with BCP 38.

Of course.  The question is how the ISP knows what the customer's address 
ranges are, without demanding vast amounts of nitpicky manual work on both 

John Levine, johnl at iecc.com, Primary Perpetrator of "The Internet for Dummies",
Please consider the environment before reading this e-mail. http://jl.ly

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