Pervasive Code

If you’ve been using SSH for long you’ve probably seen this at least once: Address 11.22.33.44 maps to www.foobar.com, but this does not map back to the address - POSSIBLE BREAK-IN ATTEMPT!

Sometimes this is helpful. Sometimes this is really annoying and incorrect. Assuming you are a moderately well informed sysadmin and know that this message can safely be ignored, you might have been stumped trying to silence it. You may have tried every option in man ssh_options and even some of your own (STFU on?) I think I may be able to help.
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