From: "Geo." 

We do that now, ingress/egress filtering at the point we connect to the
backbones, but how are you going to solve the problem of one of your
customers spoofing as another of your customers?

Geo.

"Mike Nice"  wrote in message
news:0f8oru4f0ka703bdb7s26um43n1em5vvsu{at}4ax.com...
> On Sun, 27 Oct 2002 10:08:29 -0500, "Geo."
 wrote:
>
> >Lets say I'm at 216.144.26.35, how are you going to stop me from spoofing
at
> >216.144.26.40 or .253? Are ISP's now supposed to add in filters to
customer
> >routers or are we expected to have such large routers of our own that we
can
> >have acl's with thousands of entries?
>
>    Spoofing another IP in the same network is a nuisance, but at least
having the border routers
> prevent spoofing  prevents them from buying a DSL connection from you and
filling it with
> difficult-to-trace Net Send spam all day.   At least this way, Messenger
spam complaints come to you
> and it's up to you to track them to the source.
>

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