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

William Herrin bill at herrin.us
Wed Feb 5 00:18:56 UTC 2014

On Tue, Feb 4, 2014 at 6:24 PM, John R. Levine <johnl at iecc.com> wrote:
>> 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
> sides.

Hi John,


Why does it have to be hard? Restricting the filter to addresses which
(A) the customer asserts are theirs and (B) aren't obviously
registered to someone else would more than solve the problem.

Bill Herrin

William D. Herrin ................ herrin at dirtside.com  bill at herrin.us
3005 Crane Dr. ...................... Web: <http://bill.herrin.us/>
Falls Church, VA 22042-3004

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