On October 1, 2019 9:39:03 PM UTC, Matt Palmer <mpal...@hezmatt.org> wrote: >On Tue, Oct 01, 2019 at 04:50:33AM -0400, Jim Popovitch via NANOG >wrote: >> On 10/1/2019 4:09 AM, Christopher Morrow wrote: >> > possible that this is various AWS customers making >iptables/firewall mistakes? >> > "block that pesky rfc1918 172/12 space!!" >> >> AWS also uses some 172/12 space on their internal network (e.g. the >network >> that sits between EC2 instances and the AWS external firewalls) > >Does AWS use 172.0.0.0/12 internally, or 172.16.0.0/12? They're >different >things, after all. >
I don't know their entire operations, but they do use some 172.16.0.0/12 addresses internally. And yes, that is very different than 172/12, sorry for the confusion. -Jim P.
