do ISPs keep track of end-user IP changes within thier network?

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Option 82 info and logging.  

Frank

-----Original Message-----
From: Carlos Kamtha [mailto:kamtha at ak-labs.net] 
Sent: Wednesday, December 11, 2013 10:00 PM
To: nanog at nanog.org
Subject: do ISPs keep track of end-user IP changes within thier network?

Hi, 

just a general curiousity question. it's been a long time since ive worked
at an ISP. 

back then it was non-expiring DHCP leases and in some cases static IP for
all.. (yes it was long ago..) 

Any feedback would be greatly appreciated..

Carlos. 

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