Re: Dual stack IPv6 for IPv4 depletion

["John R. Levine" <johnl () iecc com>]

> > It would be nice if it were possible to implement BCP 38 in IPv6, since this
> > is the reason it isn't in IPv4.
>
> There isn't any technical reason that an organization can't fix its edge
> so it doesn't urinate bad IPv6 traffic all over the Internet.

In IPv4 systems, the problem is (so I have been told by some largish ISPs) 
that a dual homed customer gets address ranges from ISPs A and B, and 
sends traffic with A addresses to the B interface.  The ISPs have no 
practical way to tell legit dual homed traffic from malicious, 
particularly when there is a chain of resellers in between.  If the ISP 
tells the customer to send the traffic over the right interface, the usual 
response is "if you don't want our business, I'm sure we can find another 
ISP that does."

Like I said, it would be nice if ISPs could persuade their v6 customers to 
get their own PI space early on, because if they don't they'll have 
exactly the same problem.

R's,
John