Any tool or theorical method on detecting number of computer behind a NAT box?

[Joe Shen <joe_hznm () yahoo com sg>]

hi,

   Sharing internet access bandwidth between multiple
computers is common today. 

   Usually, bandwidth sharer bought a little router
with NAT/PAT function. After connecting that box to a
ADSL/LAN access link, multiple computer could share a
single access link.

   I heard some company provide prdouct for detecting
number of computers behind NAT/PAT box. 

   Is there any paper or document on how such product
work? where could I fint them ?


  Joe


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