North American Network Operators Group|
Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical
Re: Quarantine your infected users spreading malware
--On Wednesday, March 01, 2006 07:54:17 -0600 Jack Bates <[email protected]> wrote:
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).David Nolan wrote: <snip>(*): For anyone who doesn't know, URPF is essentially a way to do automatic acls, comparing the source IP of on an incoming packet to the routing table to verify the packet should have come from this interface. With the right hardware this is significantly cheaper then acl processing. And its certainly easier to maintain. And by injecting a /32 null route into the route table you can cause a host's local router to start discarding all traffic from that IP.<snip sig> 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.