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Cable Modem Hacking Guide

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Included in this pack is all the software you will need to uncap your cable modem

Below are the instructions on how to perform this hack

Written by DerEngel provided by MonkeyWrencher

E-mail [email protected]

How To UnCap Motorola Surfboard Cable Modems Step by Step with Pictures (By DerEngel) Version 2

Incase your not familiar what this is,

Cable companies put “Caps” on the cable modems of the customers on their systems

These caps are enforced to ensure everyone has a fast and reliable connection to the internet

Or cable companies wants to Tier your service,

for example sell you certain speed configuration at a price but also offer faster configurations for more

These Caps tell the modem how fast it can Send and Receive data

The original way to uncap a DOCSIS modem,

is to change the modem’s configuration file on startup with your own

You see,

a cable modems speed settings (and some other settings) are encoded into a standard DOCSIS config

Which the modem downloads when it boots up

When a cable modem comes online,

it talks to a Universal Broadband Router (URB) and the URB tells the modem to download a certain file from a server

The first process involves getting this information

The config file is stored on a TFTP Server

Once your modem downloads this config,

it processes it and if the CMTS (Cable Modem Termination System) is successful,

So to uncap your modem,

Surfboard modems,

as well as 3com Sharkfin modems have a big flaw in the original firmware’s

When the modem starts up,

bridge forwarding from the Ethernet port is enabled

If you have connected a computer with the TCP/IP protocol’s address set the same as the cable systems TFTP address,

the modem will request the configuration file from the Ethernet port instead of the coaxial connection

Rumors have spread around that this flaw in the system was actually put there in testing when the modems were being designed and manufactured

That is why this exploit of the modem usually only works with Surfboards,

because most cable modems will not request the config file from the Ethernet port

Once your modem has downloaded the config from from you,

the modem will function just as normal,

however the speed settings will be changed

Keep in mind that your speed can never go faster than you can physically get

Noise to decibel plays a big part in this,

if you are 10 miles away from your ISP (or from your local NODE’s Coax to fiber Router) you will probably surf slower than someone who is 1 mile away

This guide will show and explore how to exploit this and take advantage of your cable modem

STEP 1: Step 1: Gather information about your ISP's Cable System In this step,

we gather information about your Internet Service Provider's server

First you need to know your TFTP server

A TFTP server is where your ISP keeps certain files,

An ISP might have more than one TFTP server

Next you need to know your boot files name

A Boot file is the file that your ISP sends to your modem when if first connects to the service

The boot file is encoded with the MD5 algorithm fingerprint

(its a file protection scheme used over networks) This file contains many values,

Your going to need to know a few things

• Your Boot File Name • Your TFTP Server Address (usually the same as the DHCP) • Your Current IP I would also like to mention,

that sometimes the TFTP server can be DIFFERENT from the DHCP server

So if your modem doesn't download the file once you have changed your IP,

try to resolve another server that might have the correct IP

we need to find your TFTP server,

Click for a Larger View

The preferred way is to use the Step 2 Software from TCNiSO

Click Start Query,

and it will retrieve the values from your modem

Note: This is also a good way to see if you are uncapped

To find your DHCP server in the command prompt,

Type ipconfig /all

To find your DHCP in a web browser,


html And you should see your DHCP IP in the DHCP Server Address table

Note: Some modems wont display the correct information

To find your DHCP server in Query

Type Your MAC Address into the field (Example 00:20:40:E2:CA:5C) and then click "Fetch"

Note: Query may take up to 30 minutes while it tries to find the information


we need to find your Boot file's name

In Query,

your boot file's name should be display

it does not) DocsDiag can also show you the name of your file

A tutorial for it can be found Here

Now for most modems,

you can find the boot file name in the Logs of your modem

The logs can be found here

Retrieved TFTP Config config_silver

cm is the Name of your Boot file (This file name WILL Vary from provider) Note: If non of these methods work for you,

jump to Step 6 for an alternative way

Or try and use the Ethereal Solution

How to Capture your information using Ethereal This tutorial shows you how to grab your TFTP server IP address and the name of your config file

Your ISP can do nothing to stop you from getting this information because it is necessary in order for your cable modem to function properly

Ethereal is a network interface sniffer,

it sniffs network data packets

Using this application you can view the packets your ISP sends to your cable modem

Download Ethereal from www


note: you may have to install libraries or runtime files to run it

Once you have it running

Click on Capture and Hit Start,

this will bring up the options window you see below

Make sure your Interface is your network interface card

If you have multiple Network cards,

make sure you select the one that is connected to your modem

make sure UDP is typed into the Filter box

And finally,

Check "Update list of packets in real time"

Now this process might take some time,

but you will eventually see packets from your ISP server to your modem,

The packets you are looking for will be of Protocol SNMP,

the destination is usually 255

When you find the packet,

take a look at the ASCII and inside that should be concealed the IP of your TFTP server and the config name of your ISP

Other notes,

You will also be able to pick up the packets for business modems as well,

you will be able to see the config file name for faster configuration files


sometimes you will only be able to sniff them if they are on the same NODE as you

STEP 2: Step 2: Download your ISP's configuration Or create your own

In this step,

we retrieve the boot file so that we can modify it for the modem

The boot file controls the download speed,

CPE (external devices that are assigned IP's),

Your boot file is on a

remote server at your ISP known as the TFTP Server

Since ISP's will now try to make this difficult for you to retrieve this file,

You can use the TCNiSO Step 2 Software to download your config

You can also retrieve your config from the Command Prompt

Since ISP's can enable there systems to only let cable modems download the files,

you can try to "Spoof" your cable modems HFC Address

This can be done

HFC Address Spoofing This concept was originally derived from Byter

The principle behind this technique is to make your computer look like your modem

The first thing you need to know is your HFC Gateway (the one you use to browse the internet)

You can get your HFC address by using your modems Internal Website Go to http://192


html and write down your HFC IP Address You can also get your HFC by using Tracert (incase your Web interface is disabled) At the command prompt type and run tracert

com The first IP listed should be your HFC IP (the first IP (The A Class) should start with a 10) Once you have that information,

you need to change your computers IPs

If you need help changing your IP,

Change your IP to the IP of HFC Address,

and then add 1 to your D'Class

For example,

so if the number was 255 you could go to 254

Now that you have changed your IP,

you should be able to use the above programs or methods to retrieve your config

Once you have your config you can change your IP back or move ahead to Step 3

Note: When you change your IP address you may not be able to surf web pages

You can check out the Alternative HFC Spoofing technique here

STEP 3: Step 3: Change your config file to the desired speed

In this step,

we take a closer look at your boot file (Config)

And make necessary changes modification to change the speed

First we will decode your file,

and then re-encode if for your modem

Edit your config file using TCNiSO's own config editor called Docsis32Pro (byter)

This software makes it really easy to open up a config and change the speed values

You can find a copy of it in the Software section

For more Advanced users who wants to play with more settings

Or to create your own basic config file

Get ConfigEdit by need2down

You can also use this to create a config file in the event you don't have one

In the future we will release a easy to understand manual for all of the OID's,

SNMP Objects and expressions

Basic Config Definitions: MaxRateDown and MaxRateUp is your download and upload speeds,

these values are displayed in bits

So 10000000 equals 10Mbits

Edit your MRD and MRU to your likings

Do not make these values unreasonable high

MaxCPE is the number of devices you can connect to the modem

For example,

if you dont own a router but have a hub,

you can connect extra computers to the modem

SwUpgradeServer is the server your modem will look at to receive updates

CmMic and CmtsMic are Check sum values for the config

Any line containing this should


any line containing this should also be deleted


can be deleted or the "=" replaced with the word "Integer" SnmpMibObject

with a string after the values,

Once you edit your config,

make sure you name it the same as your original,

this new file is placed in your existing directory

STEP 4: Step 4: Setup a TCP/IP Interface on the TFTP Server IP (Change IP) In this step you setup a client that we will use to act as a TFTP Server which we will then use to send your modem your config file

To do this,

you need to have a Computer that is capable of running TFTP Software

You then will need to connect the computer to the modem through a Local Area Network (LAN)

Trouble Shooting Tip: Some times you need to unplug your modem when you change your IP

This has been reported to work on some machines when the normal method did not work

In your Local Area Connection Properties,

Choose Internet Protocol (TCP/IP) and Click Properties

Make sure your Using a Specified IP Address

Change your IP to that of your DHCP server's address

Change your Subnet mask to 255


Click OK and your machine will make the changes without restarting Windows 98 Users: To change in Windows 98 or Windows ME,

First you need to disable your Network Interface Card (NIC)

Right-Click on "My Computer",

Then Go to the device managers tab and find your NIC Card under the Network Adapters

Find your NIC Card and click Properties

And under Device Usage,

Check "Disable in this hardware profile"

Click Ok then Click Close

Under your network properties,

find your TCP/IP Protocol and Click properties

Under the IP Address tab,

Click Specify IP Address and fill in your TFTP Server IP and Subnet mask

Next Click the Gateway tab and add 192

When prompted to restart,

Click NO

Once your NIC Card is functioning again

Click Close

Proceed to Step 5

STEP 5: Step 5: Setup a TFTP on Your System And Upload the New Config Now that we have a computer setup with the IP of the TFTP Server,

you must setup and install a TFTP Server

Once the Server is configured,

the Cable Modem needs to be restarted,

it should download the config from the server

TCNiSO Step 5 (TFTP Server)

This application is really easy to use,

just set your path of your config and click Start Server

Note: This application also pings your modem while attempting to send the file

(This is sometimes necessary for some modems

) And it also sets the Time of Day on your modem

You can also use tftpd32

When you first run it,

make sure it says "Listening on port 69" Before you make any changes to the Settings Tab

Click on Properties and Make the Following Changes

Security: Non (We don't want to Authenticate your modem do we

?) Base Directory: The Directory your Edited config file is in

Use Tftpd32 only on this interface should be set to your DHCP server

Translate Unix file names (Unix systems don't support file names with Special characters or spaces

Click OK and Minimize tftpd32

exe Make sure your EDITED Boot file is in C:\ (Your Base Directory) Next,

all you have to do is restart the cable modem

Unplug your modem then plug it back in

Your Power light should come on and start Flashing

Now notice your TFTP32

It should Say that your Modem is Asking for that Boot file,

and your Server should Send it to your Modem

If your modem asks for any additional files,

unplug your modem Copy and Paste your Boot file in your C: and Rename it to the file it was asking for

As you can see,

your modem should Request the file (in this case isrrlP1BW1

bin) And Your computer should send out the file it requests

If your modem accepts the edited file

You modem now has the edited file and is uncapped

Trouble Shooting Tip: If your modem requests the boot file several times,

The first thing you should do,

is Check the modems logs and try to determine what that error is

If you see an error called 1-Emergency D8

but failed Integrity Check (MIC) This is the error that Invalid MD5 check is required

Try and use the MD5 Remover from the software section

some users with SB3100's have had to ping their modems while they restarted it

To do this go into your command prompt and type "ping

Copyright 2002

- DerEngel

com in association with TCNiSO STEP 6: Step 6: Change your Settings back and Download Since you can not browse the internet with the settings of your ISP you need to change it back to the original settings

Once that is done,

Download and Enjoy the Speed

First Restore your TCP/IP Settings You must change your IP back to one that your ISP will allow you to have online

You can enter your original settings in here,

or Set both settings to Obtain Automatically

Return back to your TCP/IP Settings

Change your IP and your Default gateway back to how you had them before

Click OK,

and your computer will go should now return and should be online

With your modem running a new config file

You should you should be able to download and upload the maximum values physically possible

My favorite part

To test your connection,

try to upload a MP3 or a file to a friend,

or go visit a very fast website

Note: Some websites might not have enough bandwidth open for you to get fast speeds to

Most Cable modems are not capped on the downstream,

Speeds will vary from your location and quality of your cable

If you found this Page useful or have ANY Questions,

If you want to help out,

please donate 5$ through PayPal

Email Address: [email protected]

One on One help can be available,

we have much to offer for capped or uncapped people alike

If your Modem's Activity light is still on and you cannot seem to connect to the internet

Your Config file might Possibly be incorrect

Unplug your modem,

Turn off your TFTP server,

Plug back in your modem

every time your modems power is cycled,

you will need to Setup a TFTP Server to Resend the the edited config

Also keep in mind that there is new firmware floating around that ISP's can use to re-cap you permanently

So don't forget to check out the Firmware section

IRC Channel is #Surfboard on Efnet On a final note if your modem will not take the config file you are trying to send to it even after you use the md5 hack

Try uploading your original untampered config

If it will upload then you may be able to find faster files in your area

For faster files use those included in the onestep program and visit fibercoax

Also currently surfboardhack

com also offers a finder called dfile thief

Have a nice day… Monkeywrencher [email protected] For msn im And Nickadavid on AIM ALSO DON’T FORGET TO VISIT THEORYSHARE