Wired captive portal pen-test

Hello,

I'm looking for information about pen-testing a captive portal commonly 
used in hotels. At least here in Spain I've seen that Quadriga 
(quadriga.com) commercial solution is commonly used. If I attach a laptop 
to the RJ45 of the room (with Quadriga), I receive an IP by DHCP. I can 
also ping the gateway. But I cannot see other IPs. I suspect they're using 
some kind of L2 filtering (to disable ARP-requests except to the gateway), 
perhaps I'm wrong, though. If I start a browser I'm redirected to a captive 
portal where I can see my room number in one of the parameters, so (I 
think) they are identifying my room by the switch port (I cannot figure 
other alternative since my laptop/MAC is not pre-registered so it's unknown 
to them).

Any information about these systems and how to pen-test them? Do you know 
which kind of security meassures does Quadriga apply in particular or more 
technical specs about this kind of systems? Do they use some special 
network hardware (hardened switch, etc)? Or are they deployed using common 
hardware (Cisco, etc)? Any manuals, tech specs, etc?

Thanks in advance for your responses and have a nice day.
-r

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