Yes. That stops all spoofed traffic. Sorry, src-address-list, not dst-address-list.
----- Mike Hammett Intelligent Computing Solutions Midwest Internet Exchange The Brothers WISP ----- Original Message ----- From: "Josh Luthman" <j...@imaginenetworksllc.com> To: af@afmug.com Sent: Friday, October 21, 2016 12:19:31 PM Subject: Re: [AFMUG] Another large DDoS, Stop Being a Dick It can't be that simple...can it? Josh Luthman Office: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373 On Fri, Oct 21, 2016 at 1:17 PM, Mike Hammett < af...@ics-il.net > wrote: /ip firewall address-list add list="Public-IPs" address=x.x.x.x/yy disabled=no comment="My IPs" add list="Public-IPs" address=x.x.x.x/yy disabled=no comment="Downstream customer X IPs" /ip firewall filter add action=drop chain=forward comment="Drop spoofed traffic" disabled=no out-interface="To-Upstream" dst-address-list=!"Public-IPs" That was largely composed off of the top of my head and typed on my phone, so it may not be completely accurate. You should also do it on customer-facing ports not allowing anything to come in, but that would be best approached once Mikrotik and the per interface setting for unicast reverse path filtering. You would then said customer facing interfaces to strict and all other interfaces to loose. They accepted the feature request, just haven't implemented it yet. ----- Mike Hammett Intelligent Computing Solutions Midwest Internet Exchange The Brothers WISP From: "Mike Hammett" < af...@ics-il.net > To: af@afmug.com Sent: Friday, October 21, 2016 11:21:35 AM Subject: [AFMUG] Another large DDoS, Stop Being a Dick There's another large DDoS going on now. Go to this page to see if you can be used for UDP amplification (or other spoofing) attacks: https://www.caida.org/projects/spoofer/ Go to these pages for more longer term bad behavior monitoring: https://www.shadowserver.org/wiki/ https://radar.qrator.net/ Maybe we need to start a database of ASNs WISPs are using and start naming and shaming them when they have bad actors on their network. This is serious, people. Take it seriously. ----- Mike Hammett Intelligent Computing Solutions Midwest Internet Exchange The Brothers WISP
