Inter-ISP/Telco/X.25 security procedures?

Mon Sep 16 17:24:38 UTC 2002

On Mon, 16 Sep 2002, Mark Kent wrote:
> >> Please see Clifford Stoll's book The Cuckoo's Egg for a description
> >> of tracking an intruder across various PSTN, PSDN and Internet providers.
> >> I haven't seen a better description of the process.
>
> And there were, what?, three US ISPs back then?
>
> And when Stanford was getting hacked, where was BBN...
> Answer: right on the Stanford campus, in Stanford buildings!
>
> We don't have the same Internet architecture as we had
> during The Cuckoo's Egg era.

I would love to become educated on today's process.  Please share
how the inter-ISP security procedures have changed.