Re: BCP38 [Was: Re: TWC (AS11351) blocking all NTP?]

["Livingood, Jason" <Jason_Livingood () cable comcast com>]

> > Can somebody explain to me why those who run eyeball networks are able
> > to block outbound packets when the customer hasn't paid their bill,
> > but can't seem to block packets that shouldn't be coming from that
> > cablemodem?
>
> i suspect the non-payment case is solved at a layer below three

In a DOCSIS network the source address verification (as Tony said) is
typically done on the CMTS IIRC. Turning a customer off for non-payment is
done in an accounts management / billing system.

While I am sure continuing to agree with each other that spoofing is bad,
we lack actionable data. ;-) As I said in another thread, I think someone
/ some group needs to invest to collect actual data and share the results
openly. 

So any volunteers out there? I¹m sure there are lots of ways to underwrite
independent research on the subject (contact me off-list).

Jason