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RE: IP announce DOS

From: "David Gillett" <gillettdavid () fhda edu>
Date: Thu, 9 Jun 2005 10:36:03 -0700
  Did you get your Class C address from the relevant authority (ARIN,APNIC, RIPE, etc)?  Or is it one that the old ISP assigned you, outof address space assigned to them?  [It sounds like you think theformer case applies, but since this is the "basics" list, I can'tentirely assume that.]  If there were a technical fix, a way to have BGP say "THIS is theOne True Path to AS ____", then everyone would enable it and we'dbe right back where we started....  Do you know your old ISP's upstream providers?  A competent ISPwill have at least two, but if they're small they might not have more than that.  Perhaps they can be persuaded not to accept thatISP's announcement of this block?David Gillett
-----Original Message-----From: Alex Thurlow [mailto:buddychrist () gmail com]Sent: Wednesday, June 08, 2005 2:24 PMTo: 'security-basics () securityfocus com'Subject: IP announce DOSI'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________________________________________SKYLISTEmail Marketing Solutions that DeliverService You Can TrustYou are receiving this email messagefrom a representative of SKYLIST, Inc.13171 Pond Springs Road, Austin, TX 78729Toll Free: 877.250.2922To cease all communication with SKYLIST, visithttp://www.skylist.net/unsubscribeor send an email to unsubscribe () skylist com
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