Here's a thought-provoking video on what Brocade has done with its SDN software load on the MLX: http://vimeo.com/87476840 (demo at ~15 minute mark) I've written it before: if there was a software feature in routers where I could specify the maximum rate any prefix size (up to /32) could receive, that would be very helpful. If my fastest speed (residential) customer was 100 Mbps and I specified that 200 Mbps was the highest, I would never see high-rate attacks enter our network. Frank -----Original Message----- From: NANOG [mailto:nanog-bounces@nanog.org] On Behalf Of Eric C. Miller Sent: Saturday, November 08, 2014 7:10 PM To: NANOG (nanog@nanog.org) Subject: DDOS, IDS, RTBH, and Rate limiting Today, we experienced (3) separate DDoS attacks from Eastern Asia, all generating > 2Gbps towards a single IP address in our network. All 3 attacks targeted different IP addresses with dst UDP 19, and the attacks lasted for about 5 minutes and stopped as fast as they started. Does anyone have any suggestions for mitigating these type of attacks? A couple of things that we've done already... We set up BGP communities with our upstreams, and tested that RTBH can be set and it does work. However, by the time that we are able to trigger the black hole, the attack is almost always over. For now, we've blocked UDP 19 incoming at our edge, so that if future, similar attacks occur, it doesn't affect our internal links. What I think that I need is an IDS that can watch our edge traffic and automatically trigger a block hole advertisement for any internal IP beginning to receive > 100Mbps of traffic. A few searches are initially coming up dry... Eric Miller, CCNP Network Engineering Consultant (407) 257-5115