ip address behind router ?

[FreeBsdBeni]

Hi,

How do I find what ip address I'm really having ? 
My adsl modem/firewall gives me a dynamic private address : 192.168.1.101, 
which is what I see with an ifconfig. But how do I find the real (dynamic) 
address given to my modem by my provider ?
I'm using 5.3-rel-p4.
-- 
Beni.
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