[Rack] Possible DNS misconfiguration for noisebridge-net-nat.monkeybrains.net

[Dr. Jesus]

An A record for the PTR record handed out for 208.69.40.71 doesn't
seem to exist, resulting in DNS checking to fail for the public
address of the monkeybrains gateway.  Here's what my SSH server says
when I try to SSH to it:

 sshd[3170]: reverse mapping checking getaddrinfo for
noisebridge-net-nat.monkeybrains.net [208.69.40.71] failed - POSSIBLE
BREAK-IN ATTEMPT!