IP announce DOS

[Alex Thurlow <buddychrist () gmail com>]

I'm not positive this is the correct list to ask, but it is a security 
concern, so I thought I would.  The company I work for had T1 lines 
running to our office provided by a local provider.  We had our own C 
block of IPs being announced by them and routed to us over those T1s.  
Our relationship with them went sour (for many reasons I won't get into 
here), and we had to move to a different provider.  We had the routing 
switched over to them.  Everything was fine.  Here it is a few weeks 
later, and suddenly our old provider starts announcing these IPs again.  
The end result is a partial DOS attack (hence writing to this list) as 
some people can't reach us.  They won't stop the announcement.  I don't 
know all the details on what they've said there as it's now gone to 
executives and legal people dealing with them.  Is there anything we can 
do here from a network standpoint?  Someone we can report them to?  How 
do people protect themselves from just anyone announcing IPs that aren't 
theirs?

Thanks in advance,
Alex Thurlow


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