RE: not rewriting next-hop, pointing default, ...

[水越 一郎 <ichiro () byd ocn ad jp>]

Enke Chen [SMTP:enkechen () cisco com] wrote on Saturday, September 13, 1997 2:29 AM

Enke>For ISPs with a lot of direct (i.e., private) peers, on the public 
Enke>NAP routers you may want to consider not installing the routes from the
Enke>private peers.  This approach could reduce the damage to your private
Enke>links by default-pointing attack.  It may also make you less likely
Enke>a target due to black-holing of certain traffic. 

And on the NAP router, 
        adding the blackhole segment  ( null 0 or dumb ether etc.) 
                On cisco, null 0 is not recomended for its process switching
        set the default route to the blackhole segment
        check the packet in the segment.
These packets are routed by default, so call the routing police :-)

Enke>This approach is not applicable if transit service is provided at 
Enke>the public NAP. 

Peering in  tunneling COULD work.

ichiro () byd ocn ad jp (AS4713<-AS2521<-AS2519)