[168791] in North American Network Operators' Group
Re: BCP38 is hard, was TWC (AS11351) blocking all NTP?
daemon@ATHENA.MIT.EDU (Octavio Alvarez)
Tue Feb 4 19:23:23 2014
Date: Tue, 04 Feb 2014 16:23:01 -0800
From: Octavio Alvarez <alvarezp@alvarezp.ods.org>
To: "John R. Levine" <johnl@iecc.com>
In-Reply-To: <alpine.BSF.2.00.1402041823480.57249@joyce.lan>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On 04/02/14 15:24, John R. Levine 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.
The same way BGP outbound prefix filters are applied nowadays, would be
a good start. Some have BGP filtering but don't have ACLs.
