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- -- "william(at)elan.net" <william@elan.net> wrote:

>On Sat, 7 Apr 2007, Fergie wrote:
>
>> I would have to respectfully disagree with you. When network
>> operators do due diligence and SWIP their sub-allocations, they
>> (the sub-allocations) should be authoritative in regards to things
>> like RBLs.
>
>Yes. But the answer is that it also depends how many other cases like
>this exist from same operator. If they have 16 suballocations in /24
>but say 5 of them are spewing, I'd block /24 (or larger) ISP block.

Why? When you can block on more specific prefixes? This just
doesn't make sense to me.

>The exact % of bad blocks (i.e. when to start blocking ISP) depends
>on your point of view and history with that ISP but most in fact do
>held ISPs partially responsible.

Indeed -- your point of view. Which I would argue is unfair
and not "due diligence".

- - ferg

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--
"Fergie", a.k.a. Paul Ferguson
 Engineering Architecture for the Internet
 fergdawg(at)netzero.net
 ferg's tech blog: http://fergdawg.blogspot.com/


