Re: ZOMG: IPv6 a plot to stymie FBI !!!11!ONE!

[Arturo Servin <arturo.servin () gmail com>]

        If the ISP fails to filter my bogus space and leak that route to the Internet (which happens today everyday 
with IPv4, and will with IPv6) I would get my return path.

        Again, if every ISP followed  BCP 38 that would not happen (IPv6 and IPv4). But they are not, and probably they 
won't.

.as


On 17 Jun 2012, at 15:41, John Levine wrote:

> >      BCP 38 would work. The problem is that many ISPs do not ingress filter, so I
> > can use whatever unnallocated IPv6 space
> > (2F10:baba:ba30:e8cf:d06f:4881:973a:c68) to SPAM and then go invisible and use
> > another one (2E10:baba:ba30:e8cf:d06f:4881:973a:c68)
>
> How do you plan to get the return packets?  DNS bombing with forged
> address UDP packets is one thing, but anything that runs over TCP
> won't work without return routes.  If the bad guy can inject routes,
> you have worse problems than lack of SWIP.
>
> (This assumes the target is not using a 20 year old TCP stack with
> predictable sequence numbers, but in the IPv6 world we should be able
> to assume that particular security hole is closed.)
>
> I expect bad guys to hop around within a /64 or whatever size
> allocation the ISP assigns to customers, but that's still easily
> handled by SWIP, or by subpoena to the ISP if they didn't get around
> to SWIP.
>
> R's,
> John