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Unable to Access Instances

I've been setting up OpenStack Stein according to this guide and I am having issues accessing my newly deployed instances. I can't ping them, they don't show up in my DHCP, and every suggestion I've seen on the subject is unhelpful.

I've tried adding SSH and ICMP rules, I've tried using different images, defining the rules by CIDR instead of security groups, nothing seems to help. Any ideas would be greatly appreciated.

A few more details about my environment: OS: Ubuntu 16.04 Server and my network setup is slightly different than theirs to suit my environment, but conceptually everything should be the same.