> > => Forward them where?? I can't imagine BGP not filtering
  > > SLs coming from the downstream customers. Regardless
  > > of what the spec says. 
  > 
  > BGP is not the point.  Consider e.g.:
  > 
  > [attacker] --- [internet] ---- [ISP] --- [customer w/ site locals]
  > 
  > Now the attacker can send packets with a fec0::/10 source 
  > address to the
  > customer -- no one will block them unless they're 
  > explicitly configured as
  > site borders -- before the customer itself.  And if the 
  > customer does not
  > block them, we're in for very serious trouble.

=> So you're talking about two misconfigured 
sites and you didn't say, where is the attack ?

Also even if this happens it's a one-way 
communication because if the customer tries 
to reply packets will go nowhere.

Hesham
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