different between loopback vs nonloopback

English

loop +? back

loopback (countable and uncountable, plural loopbacks)

The routing of a signal, data stream, etc. from its origin back to the origin, primarily as a means of testing the transmission or transportation infrastructure.

non- +? loopback

nonloopback (not comparable)

Not of or pertaining to a loopback mechanism.
- 2005, Daniel J Barrett, Richard E Silverman, Robert G Byrnes, SSH, the secure shell: the definitive guide
  To eliminate the problem, use the server's nonloopback IP address as the target; this causes the FTP server to originate data connections from that address.

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