Tracking GB Usage

Paul Stewart paul at
Wed Jan 19 17:43:53 UTC 2011

Interesting - thanks. I'll definitely have to check that out.





From: at
[ at] On Behalf Of
Tom Martinson
Sent: Wednesday, January 19, 2011 12:18 PM
To: dhcp-users at
Subject: Re: Tracking GB Usage


IPDR was developed for just this use case.  

In the basic DOCSIS IPDR implimentation (all CMTSs have to do IPDR to pass
cable labs, and your Cisco and Arris both do theses) the following is the
information that is tied together.  All you have to do is set the CMTS to
export IPDR records and then setup a server to collect them.  


CMTShostName            Name of the CMTS CMTSipAddress IP Address of the
CMTSsysUpTime          SysUpTime taken from the CMTS 
CMTScatvIfName         CATV interface name from the Interfaces Group 
CMTScatvIfIndex         CATV interface index 
CMTSupIfName            Upstream interface name 
CMTSupIfType               Upstream interface type
CMTSdownIfName         Downstream interface name 
CMmacAddress          The MAC address of the Cable Modem
CMdocsisMode             The registration mode for this modem (1.0, 1.1 or
CMipAddress              The IP address of the Cable Modem
CMCPEipAddress         List of IP address assigned to CPE's behind the Cable
Rectype                       Interim indicating that the Service Flow is
still running. Stop indicating that it has completed
RecCreationTime     UTC time of record creation
serviceIdenifier          Service Flow ID or DOCSIS 1.0 SID
GateID                        GateID for PacketCable initiated service flows

serviceClassName     Service Class Names applied to the service flow by the
CMTS if implemented
serviceDirection          Upstream or Downstream
serviceOctetsPassed     Current or final count of octets passed by this
service flow (usage counting)
servicePktsPassed      Current or final count of packets passed by this
service flow
serviceSlaDropPkts     Number of packets dropped by the CMTS when enforcing
serviceSlaDelayPkts     Number of packets delayed by the CMTS when enforcing
serviceTimeCreated     The CMTS sysUpTime when the service was created

On 01/19/2011 11:59 AM, Simon Hobson wrote: 

Paul Stewart wrote: 

I should have elaborated a bit more though - if we used flow data as an
example we would need a way to "bind" the cable modem MAC to the usage..? 

Monitor log files to pick up changes/assignments ? 
Add "on <something>" events to your DHCP config to update an external table

Once you've extracted information from DCHP to relate
devices/addresses/users then it's left as an exercise for you to then
capture traffic flows. If they are your own cable modems, then potentially
you could just use SNMP to capture interface counters. 

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