<s>
AirMarshal	B-Device
is	O
a	O
web-based	O
authentication	O
server	O
or	O
captive	O
portal	O
for	O
ethernet	O
based	O
networks	O
.	O
</s>
<s>
Similar	O
technology	O
is	O
in	O
use	O
popularly	O
to	O
control	O
access	O
to	O
many	O
of	O
today	O
's	O
Internet	B-Application
HotSpots	I-Application
.	O
</s>
<s>
Network	O
authentication	O
,	O
authorization	O
and	O
accounting	O
are	O
provided	O
via	O
the	O
RADIUS/AAA	O
protocol	O
.	O
</s>
<s>
A	O
variety	O
of	O
network	O
topologies	O
are	O
supported	O
by	O
Air	O
Marshal	O
including	O
Layer	O
3	O
routing	B-Protocol
,	O
NAT	B-Protocol
and	O
Layer	O
2	O
transparent	B-Protocol
bridging	I-Protocol
.	O
</s>
