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Re: Quarantine your infected users spreading malware
On Wed, 1 Mar 2006, David Nolan wrote:
I think when he said fun, he meant 'masochistic and nerve wracking, in a vaguely entertaining because we have scripts issuing and removing ACLs from our routing core kind of way.' I've built reactive firewalls before, but even I'd be leery of a reactive ACL implementation. /32 null route injection is far far easier to manage. =)Interesting... Thats actually basically what we were doing before, but phased out in favor of the URPF & host routes approach. We felt the URPF approach was much cleaner, and more efficient. A routing table lookup is more efficient then a acl processing, particulary if you have significant numbers of rou and solved some problems we were having. It also solved some issues we had, including keeping dynamic acls synchronized betwen two redundant routers (HSRP pairs and/or redundant border routers).Yeah, but it's not near as fun as dynamic acls updated via a script monitoring flow logs in real-time. It's definitely easier to implement, though.