Dynamic Address Translation ...

[sn]

Hi
 currently I came across a product call nomadix 
 hotspot gateway
(http://www.nomadix.com/products/hsg25.asp)
 in the spec , they stated that the client dodn't 
 have to change their ip to access the internet
through the gateway server ( and using the their own
patent technology )
 is there any similarity in FreeBSD or linux ?
 thanks 
 sean

__________________________________
Do you Yahoo!?
The New Yahoo! Search - Faster. Easier. Bingo.
http://search.yahoo.com