RADIUS Attribute - Acct-Input-Octets
As Per RFC 2866
This attribute indicates how many octets have been received from the port 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.
A summary of the Acct-Input-Octets attribute format is shown below. The fields are transmitted from left to right.
Type (IETF Number) - 42 for Acct-Input-Octets.
Length - 6
Value - The Value field is four octets.