This is done by using the Cisco Docsis configuration software in the docsisConfig directory (also available from ). Now it’s time to edit it to change the modem’s cap. You just downloaded the docsis configuration file from your ISP. Note that you might now go to and see some of you modem’s parameters. It has a lot of help on how to make it work for different modems. If not, please refer to the DocsDiag - DOCSIS cable modem diagnostics.htm file in the same directory.
This application works as is in many cases. IP address.10. = 10. IP address.192.168.100.1 = 192.168.100.1 (the IP address of the cable modem, (replace this with yours throughout in the doc) Among these, the one we need are:Ĭonfiguration TFTP Server = 24.56.78.90 (replace this with yours throughout in the doc)Ĭonfiguration filename = isrr.bin (replace this with yours throughout in the doc) It uses SNMP to return many of the modem’s parameters. This application, along with all others, is included in the CableUnCap.zip file. For this we can use the docsisDiag utility ( ). First, we have to find out the TFTP server and file name used by the cable modem. We’ll download the docsis config file, edit it to change the cap parameters, then trick the cable modem in thinking our PC is the TFTP server so it then retrieves our copy of the docsis file. The cable modem then retrieves that file and connects to the backbone.
This file is the Docsis configuration file that, among other things, sets a cap for the modem’s download/upload bandwidth. I’ll explain the issues with this later.Įvery time the cable modem is powered on, it looks in its configuration file for the address of an TFTP server and for a file name. All of the following steps apply to both cases, except the final one that deals with TFTP. (2) The PC is connected to a NAT router, whose WAN port is then in turn connected to the cable modem. (1) The PC is directly connected to the cable modem. There are usually two network configurations. How to uncap Docsis compliant Cable Modems
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