Packets that turn up unexpectedly on the wrong network because of bogus routing
entries. Also a packet which has an altogether bogus (non-registered or
ill-formed) internet address, such as the test loopback interface [127.0.0.1].
Such a packet will come back labelled with a source address that is clearly not
of this earth. "The domain server is getting lots of packets from Mars. Does
that gateway have a martian filter?"
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