BGP: Advertising subnets of existing networks ?

Hello Experts,

I read an article "YouTube Hijacking: A RIPE NCC RIS case study" about an
ISP in Pakistan blackholing YouTube networks:
http://www.ripe.net/internet-coordination/news/industry-developments/youtube-hijacking-a-ripe-ncc-ris-case-study

In the Event Timeline it says that at 20:18 (UTC):
"AS36561 (YouTube) starts announcing 208.65.153.128/25 and 208.65.153.0/25."

I am curious how they did it. I built a small scenario but I can not make it
work:

AS100---AS200---AS300---AS400
R1------R2------R3------R4

R1 advertises:
Loopback 0: 1.1.0.0/24
Loopback 1 :1.1.1.0/24
Loopback 2 :1.2.2.0/24
Loopback 3 :1.1.3.0/24

I know that I can configure R2 with "bgp inject-map" and inject 1.1.3.0/25and
1.1.3.128/25.

My goal is to configure R1 such that all other routers will see 1.1.3.0/25and
1.1.3.128/25. Do not reconfigure Loopback 3. Is this possible ?

Thanks,

Blogs and organic groups at http://www.ccie.net
Received on Tue Jun 28 2011 - 17:31:25 ART