I have wireless hotspot device (Handlink WG-601) which I need to replace with 
FreeBSD machine. 
The device has following functionality I need to replicate: 

1. It has dhcp server (that's easy) 
2. It makes NAT between it's "internal" interfaces and "wan" interface (easy 
too, but look at 3). 
3. It actually responds on every ARP request coming on it's internal 
interfaces. That allows it to act 
as router for machines that instead of using dhcp are configured with wrong 
static IP addresses. 
4. It can use RADIUS for authentication of the users. 
Actually, non-authenticated users are given IP address (no WPA, TKIP, etc) and 
when they first 
try to load a web page are redirected to authentication web-page. Then their 
username and password 
are checked against RADIUS database and only then they are allowed to connect 
to the outer network. 

Two more things: 

1. It was part of a larger wireless hotspot service, sponsored from the 
government and implemented by outer organization, so buying another with my 
organization's money is out of the question. 
2. I'm aware of the issues with security but again I cannot modify the policy 
there.

I'll be very thankful for any ideas.

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