Uncapping Cable modem

By SuperCheetah · 27 replies
Mar 27, 2002
  1. Don't know how legal this is, but it seems like a cool little trick. Here the link if anyone wants to try it:
    To the mods, if this is offensive to 3DS, please feel free to remove it immediately. Thanks.
  2. boeingfixer

    boeingfixer TS Rookie Posts: 1,006

    You may not have to worry Super, at 3:00pm eastern. The link was down. :(

    I was hoping to at least read it.

    However, it is also on Cable-modems.org
  3. PHATMAN5050

    PHATMAN5050 TS Rookie Posts: 593

    i dont believe it works, i've tried multiple programs which tell me how to do it, and i have tried them all without luck. Has anyone actually gotten one to work?
  4. boeingfixer

    boeingfixer TS Rookie Posts: 1,006

    I have used the patches from speedguide and they increased my speed a bit. Basically allowed windows to open up as wide as it could go on my cable modem.
  5. Phantasm66

    Phantasm66 TS Rookie Posts: 5,734   +8

    Well ya'da'know??? The Motorola Surfboard Cable Modem is my cable modem.....
  6. SuperCheetah

    SuperCheetah TS Rookie Topic Starter Posts: 709

    I've also used the patches that SpeedGuide has with some success.

    Phantasm66, well how about that, perfect little guide for you then. ;)

    I haven't tried this yet although I'm very tempted to. I'm alittle scared because I hear if you don't take the right precautions you'll get busted by the cable company, especially here in the States.
  7. Phantasm66

    Phantasm66 TS Rookie Posts: 5,734   +8

    yes, its cable fraud, and I think you can go to jail for that....

    the guide is merely there as an intellectual exercise and is not condoned....
  8. svtcobra

    svtcobra TechSpot Paladin Posts: 761

    After the 3rd or 4th step I bailed on it...My internet is fast enough..
  9. SuperCheetah

    SuperCheetah TS Rookie Topic Starter Posts: 709

    That's what I'm thinking cobra. My internet is plenty fast and the benefits just don't outweight the risks to me. Maybe I'll muster the courage to do this tweak someday...
  10. svtcobra

    svtcobra TechSpot Paladin Posts: 761

    Im just to lazy..

    Plus I dont want to get arrested..;)
  11. Prelapsarian

    Prelapsarian TS Rookie

    All new cable modems (and systems) are configured on the headend, not on your cable modem. Older modems and systems had the filters and configuration on your cable modem itself. That makes it easier to tamper with, but unless you bought the modem, tampering would be bad. Even if you did own the modem, you would be abusing your provider's network infrastructure, and they would certainly give you a warning for it (if not cancel your service).

    Registry tweaking is your best bet to maximize your connection.

    I used to do tech support for @Home... I've seen some of the "uncappers" and they are a load of crap. Although I know some do/did work, like I said above, they were for older systems with older modems.
  12. NameUser

    NameUser TS Rookie

    This person tells the truth. Or I'm just cool. If I can do this after 2 months of messing around with my 56k connection. Then cable modem isn' t too hard to believe. I foud a cool tweak setup. I'm on a 56k internal PCI modem. with mods galore to softwear and registry. bla bla bla.

    enter 98103 for the zip
    You'll see me at the bottom!
    I was able to duplicate the results with Two differnt ISP's one of which is 56k ONLY! www.nocharge.com You can verify the isp by clicking on the link on the left!

    56k has a cap on upload of 28.8 I think or 36..... at V92 I'm running a V90 modem. God has blessed me much!

    I think they did it for real guys. A little faith can move a mountain! :) Try Beat that!
  13. poertner_1274

    poertner_1274 secroF laicepS topShceT Posts: 4,172

    I have known a few people that have actually uncapped their modem. And YES it is ILLEGAL. You could goto jail for it, or lose your ISP. Which sux, cause I think they put you on a blacklist and distribute it to other ISP's. Not sure though. But the guy that did it said his ISP is retarded and he said it is going at an incredible rate too. 5mb down /1mb up, and this is on a 56K modem.
  14. SuperCheetah

    SuperCheetah TS Rookie Topic Starter Posts: 709

    WOW!!! :eek: That's incredible! Maybe this is worth trying then...:)
  15. NameUser

    NameUser TS Rookie


    ZIP IS 98103 at the bottom USER HAS 56/28(k)
    Speed DOWN/UP 40/103,104,68,75
    Blarg/Nocharge.com Nocharge is a free 56K ISP.

    Not the top. not 5.6(M)
  16. poertner_1274

    poertner_1274 secroF laicepS topShceT Posts: 4,172

    Remember I said it IS illegal, so be careful, and I take no responsibility for telling you this :)
  17. SuperCheetah

    SuperCheetah TS Rookie Topic Starter Posts: 709

    Believe me I understand. I was just kidding. I don't think a little extra bandwidth is worth going to jail over. I personally wouldn't do this unless I knew it was safe to do and not illegal.
  18. Phantasm66

    Phantasm66 TS Rookie Posts: 5,734   +8

    And its not and it isn't. This is a fascinating tweak but really not worth the possible results, even if that's your cable modem never working again....
  19. mnosteele52

    mnosteele52 TS Rookie

    Don't even think about uncapping your ISP will know immediately and the yank your connection and you'll be stuck with 56K again.:confused: :)
  20. Phantasm66

    Phantasm66 TS Rookie Posts: 5,734   +8

    he is right, i abandoned my project to run 2 cable modems in my home due to the possibility of being caught and banned from the service. then I am back in dial up 56ker land again !!?! I can't think of anything worse....
  21. StormBringer

    StormBringer TS Maniac Posts: 2,244

    If you have actually done this, which I find very hard to believe, then you need to share what you did. I don't want to get speeds that might cause me to lose my ISP or land me in jail, I just want to get faster than a 26.4k connection and 1.5kbps transfers.
  22. Tweakster

    Tweakster TS Enthusiast Posts: 199

    So is uncapping a hardware tweak and is it like unlocking a processer graphics, card etc?

    What is the fastest you can uncap a 56k modem and would it be illegal to uncap a 56k modem evern in UK?
  23. mnosteele52

    mnosteele52 TS Rookie

    There is no such thing as uncapping a 56K modem, it is possible to uncap a cable modem but it is illegal and you will have your service disconnected and be fined and face possible jail time.:)
  24. crusher98

    crusher98 TS Rookie

    Here is something I found ,This is Illegal and you could be caught so do not try this unless you are willing to take the chance,you have been warned.
    I am not sure if this has been posed here or not ,but i am in to testing things and if i see good information sometimes i try it and sometimes i don't .
    This one i will try right before i move back to AZ ,and i know this will work .
    Als their is another program that is eithier out or will be out Called ONESTEP I am looking for it as i write but i will post this first and then when I find it will see if it is allowed by the MODS.
    here is the information.I hope this is ok to post if not please let me know I looked for the forum rules and could not anything on this.


    I've been sitting on this for a while debating morally
    weither or not I should post it. After being lied to by multiple
    cable internet companies, told that I'm stupid by cable modem
    vendors, and having my access turned off for complaining about
    broken DNS i've decided that it's time to post.

    2) legal stuff

    This is theft of service, you will be probably get caught, don't
    do it if you value your cable internet service.

    This document is only to be redistributed/copied with the original
    text included (including credit to myself).

    3) explanation

    Companies are out to make money, they hire people with book knowledge,
    and stupid things like this happen. (Hi AT&T, your DNS is _still_ broken
    even after it was fixed for 2 weeks)

    Basicly it's a simple ARP caching thing, it's easy to fix in the modems
    and somewhat easy to obscure at the ISP. I'm sure *someone* must have
    done this besides me, but from all my searches on the web I've seen
    nothing but 'it's impossible' messages, the only people I know that
    can do it are people I showed how. I'm sure i'm going to upset those
    people by posting this, oh well.

    4) Let's get started

    Cable modems known to work with this:
    3Com Sharkfin (all models)
    Motorola (all models)
    Toshiba PCX1100
    Cisco (?)

    Modems that probably don't work:
    RCA DCM235
    3Com CMX (USR)

    First, you need the following:
    An operating system with
    1) A tftp server,
    2) snmp software (I used ucd-snmp),
    3) a DOCSIS config file generator such as this one:

    5) Go go go.

    a) determine the address of the modems TFTP server, some modems
    are nice enough to give this info to you on their web interface,
    others via SNMP, i've been told that a lot of providers use the
    same address as their DHCP servers. Most modems use
    as their interface address, try to snmpwalk it with the coax
    disconnected after rebooting (some retain their config information,
    but reset the community strings). (AT&T/MediaOne has 'public'
    enabled for the ro string.. go from there)

    b) determine the name of the configuration file, use the same methods
    as above, or see below if you're running a semi intelligent tftp server.

    You need to generate a DOCSIS config file for your modem to use, read
    the documentation and examples from the docsis config file program
    mentioned above.

    c) set the address of your chosen machine to the address of the
    tftp server, start pinging the address of the cable modem
    ( usually), this will cause the modem to put
    you in its arp tables when you reboot it (reboot it now)

    d) the modem will (hopefully) connect to your machine and start
    (trying) to download the configuration file, if you couldn't determine
    what it was named earlier this is where the smart tftp server comes in,
    it should tell you what file name the modem attempted to grab.

    e) You're done, easy wasn't it?

    Happy surfing.

    Matthew S. Hallacy FUBAR, LART, BOFH Certified
    http://techmonkeys.org/~poptix GPG public key 0x01938203

    Matthew S. Hallacy FUBAR, LART, BOFH Certified
    http://techmonkeys.org/~poptix GPG public key 0x01938203
  25. ßas']['arD

    ßas']['arD TS Rookie


    You have done something to your modem to give you a false reading, or are just outright full of shiite. It is ABSOLUTELY impossible to get more than 53Kbps over a dial-up connection (either direction), period. Phone lines are capable of up to almost 57Kbps at best; however, the FCC restricts speeds to 53Kbps universally. Even if you replaced ROM chips on your modem, you'd never see more than this...whether v90, v92, or whatever.

    Secondly, upload speed is only an issue if you're transferring files or hosting a game server. Game servers are useless at such speeds. When surfing the web, the only uploading done is an "ACK" or acknowledgement to the hosting server that you've received packets and please send/or re-send more. Web surfing, therefore, has no use for jacked upload speed.

    I could understand your speed claims if you had two modems "shotgunned" together, but in essence this is two connections. Not all ISP's support this configuration as well, and it's doubtful that a free one would.

    Basically, you're not getting what you think you are. Sorry. I haven't used dial-up since 1997...I've had a cable modem since then and I'm pleased. I highly recommend it. This is about what I get all day, everyday:
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