What "radacct" are you talking about? The Acct-Input-Octets stops at 2G because the RFC dictates that it's a 32-bit integer. That's why the Acct-Input-Gigawords attribute was defined. It goes past 2G.
I'm talking about the detail file from freeradius. This is what I found in RFC2869 5.1. Acct-Input-Gigawords Description This attribute indicates how many times the Acct-Input-Octets counter has wrapped around 2^32 over the course of this service being provided, and can only be present in Accounting-Request records where the Acct-Status-Type is set to Stop or Interim- Update. So I assumed that the wrapping went @ 4GB instead of 2GB
From RFC2866:
Value The Value field is four octets. Also: integer 32 bit unsigned value, most significant octet first. So its 32bit. (4GB right??) I will use 2147483647 for now. But I can't find the definition which says that it should be 2GB so I need to be sure. J.