<s>
A	O
Martian	B-Protocol
packet	I-Protocol
is	O
an	O
IP	B-Protocol
packet	B-Protocol
seen	O
on	O
the	O
public	O
Internet	O
that	O
contains	O
a	O
source	O
or	O
destination	O
address	O
that	O
is	O
reserved	B-Protocol
for	I-Protocol
special-use	I-Protocol
by	O
Internet	O
Assigned	O
Numbers	O
Authority	O
(	O
IANA	O
)	O
as	O
defined	O
in	O
,	O
Appendix	O
B	O
Glossary	O
(	O
Martian	O
Address	O
Filtering	O
)	O
.	O
</s>
<s>
On	O
the	O
public	O
Internet	O
,	O
such	O
a	O
packet	B-Protocol
either	O
has	O
a	O
spoofed	O
source	O
address	O
,	O
and	O
it	O
cannot	O
actually	O
originate	O
as	O
claimed	O
,	O
or	O
the	O
packet	B-Protocol
cannot	O
be	O
delivered	O
.	O
</s>
<s>
Martian	B-Protocol
packets	I-Protocol
commonly	O
arise	O
from	O
IP	B-Protocol
address	O
spoofing	O
in	O
denial-of-service	O
attacks	O
,	O
but	O
can	O
also	O
arise	O
from	O
network	O
equipment	O
malfunction	O
or	O
misconfiguration	O
of	O
a	O
host	B-Device
.	O
</s>
<s>
In	O
Linux	B-Application
terminology	O
,	O
a	O
martian	B-Protocol
packet	I-Protocol
is	O
an	O
IP	B-Protocol
packet	B-Protocol
received	O
by	O
the	O
kernel	O
on	O
a	O
specific	O
interface	O
,	O
while	O
routing	O
tables	O
indicate	O
that	O
the	O
source	O
IP	B-Protocol
is	O
expected	O
on	O
another	O
interface	O
.	O
</s>
<s>
The	O
name	O
is	O
derived	O
from	O
packet	B-Protocol
from	O
Mars	O
,	O
meaning	O
that	O
packet	B-Protocol
seems	O
to	O
be	O
not	O
of	O
this	O
Earth	O
.	O
</s>
<s>
In	O
both	O
IPv4	B-Protocol
and	O
IPv6	B-Protocol
,	O
a	O
Martian	B-Protocol
packet	I-Protocol
has	O
a	O
source	O
address	O
,	O
a	O
destination	O
address	O
,	O
or	O
both	O
within	O
one	O
of	O
the	O
special-use	O
ranges	O
.	O
</s>
<s>
6to4	B-Protocol
is	O
an	O
IPv6	B-Protocol
transition	I-Protocol
technology	I-Protocol
where	O
the	O
IPv6	B-Protocol
address	O
encodes	O
the	O
originating	O
IPv4	B-Protocol
address	O
such	O
that	O
every	O
IPv4	B-Protocol
has	O
a	O
corresponding	O
,	O
unique	O
IPv6	B-Protocol
prefix	O
.	O
</s>
<s>
Because	O
6to4	B-Protocol
relays	O
use	O
the	O
encoded	O
value	O
for	O
determining	O
the	O
end	O
site	O
of	O
the	O
6to4	B-Protocol
tunnel	O
,	O
6to4	B-Protocol
addresses	O
corresponding	O
to	O
IPv4	B-Protocol
martians	O
are	O
not	O
routable	O
and	O
should	O
never	O
appear	O
on	O
the	O
public	O
Internet	O
.	O
</s>
<s>
Teredo	B-Protocol
is	O
another	O
IPv6	B-Protocol
transition	I-Protocol
technology	I-Protocol
that	O
encodes	O
the	O
originating	O
IPv4	B-Protocol
address	O
in	O
the	O
IPv6	B-Protocol
address	O
.	O
</s>
<s>
However	O
,	O
the	O
encoding	O
format	O
encodes	O
the	O
Teredo	B-Protocol
server	O
address	O
and	O
tunnel	O
information	O
before	O
the	O
IPv4	B-Protocol
client	O
address	O
.	O
</s>
<s>
Thus	O
there	O
is	O
no	O
definable	O
set	O
of	O
prefixes	O
more	O
specific	O
than	O
for	O
Teredo	B-Protocol
packets	B-Protocol
with	O
martian	O
end-site	O
addresses	O
.	O
</s>
<s>
It	O
is	O
,	O
however	O
,	O
possible	O
to	O
spoof	O
Teredo	B-Protocol
packets	B-Protocol
with	O
the	O
Teredo	B-Protocol
server	O
IPv4	B-Protocol
address	O
set	O
to	O
a	O
martian	O
.	O
</s>
<s>
Martian	B-Protocol
packets	I-Protocol
have	O
no	O
relation	O
to	O
the	O
concept	O
of	O
interplanetary	O
communications	O
.	O
</s>
