tmnxPppLocalMagicNumber is the local magic number to be sent to the
peer. The magic number provides a method to detect loopbacks. If the
value of tmnxPppLocalMagicNumber is the same as the value of
tmnxPppRemoteMagicNumber, then it is possible that the link might
be looped back. If the two magic numbers do not match, then the link
is not looped back.