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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: MD5 for TCP/BGP Sessions
On Wed, 30 Mar 2005, John Kristoff wrote: [on bgp/md5 and acl's] I would be double careful here, just to make sure everybody understands what you're protecting.ACLs are often used, but vary widely depending on organization. It can be difficult to manage ACLs on a box with a large number of peers that uses many local BGP peering addresses. I'm sure some organizations reviewed and updated their ACLs as a result of the last scare, but that is a local, private decision and it would probably be hard to get good sample of who and what changed. iBGP sessions? ACLs are trivial if you have your borders secured. eBGP sessions? GTSM is your friend (if supported). Practically, if you know your peer and you also protect your borders, ACLs are rather trivial as well. What you seem to be saying is using ACLs to enumerate the valid endpoints for eBGP sessions. That goes further than the above but indeed is also a pain to set up and maintain. There are other attacks you can make against TCP sessions (protected by MD5 or not) using ICMP, though. (see draft-gont-tcpm-icmp-attacks-03.txt). -- Pekka Savola "You each name yourselves king, yet the Netcore Oy kingdom bleeds." Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings
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