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How can I change the Mac Address on a 3800HGV-B router for the internet

By yyiiyyii ยท 21 replies
Apr 24, 2008
  1. How can I change the Mac Address on a 3800HGV-B router for the internet or can I spoof the address on a internet router.

    I know i can spoof my computer mac address but i want to spoof the mac address for the internet router
  2. kimsland

    kimsland Ex-TechSpotter Posts: 14,524

    You cannot change any hardware mac address

    Also if spoof means hide. Then be aware that your questions are still vague
    I still do not believe you asking the correct questions, and getting the wanted answers.

    It would be much easier to just state what you want to do, and possible state what hardware (and OS) you have. Please elaborate a little!

    Anyone replying with support statements should realize that "yyiiyyii" has asked similar one line questions on other posts.

    yyiiyyii, can you see how much writing I have done here, it's not hard to do.
  3. yyiiyyii

    yyiiyyii TS Rookie Topic Starter Posts: 105

    When i say spoof the mac address i mean change it to a made up one. The reason i want to do this is dhcp ties a ip lease to the mac address. so if i can change the mac address then i can get a new internet ip address
  4. kimsland

    kimsland Ex-TechSpotter Posts: 14,524

    It's true your Mac address can be assigned the same internal IP all the time from the DHCP server or router. (strange but true)

    But the external IP (ie the one that everyone sees, and probably the one that you want changed!) is assigned statically (always the same) from your Internet Service provider.

    Mind you, this External IP can be changed too.
    1. By your ISP (usually by calling them, and asking a few dozen times!)
    2. By hiding it (this is not exactly changing, but has the same effect.

    There are a few programs that can hide your External IP. ie. HideIP or Anonymizer. Actually there are many different programs that can do this.

    There are even websites, that can be used (putting their URL before the page you want to view) to hide your IP (can't remember the site, but can get it.

    Even add-ons to Firefox that can do this: http://www.how-to-hide-ip.info/

    One of the best ways is to use a Linux firewall server to hide squid ip (mainly mail)

    You can also use programs like Tor: http://www.torproject.org/ there are others too.

    Hiding your external IP can be done in many ways, but be aware that it can still be traced back to you, it's just difficult for the average person to do.

    Is that the information you needed ? Because your reply still wasn't that clear !
  5. yyiiyyii

    yyiiyyii TS Rookie Topic Starter Posts: 105

    Hiding the IP is not something i want to do, because that makes the browseing to slow.

    I want to change the external IP Address and I have called American Teleagraph and Telephone better known as At&t more then a few times. And they can not or will not change it for me.
  6. kimsland

    kimsland Ex-TechSpotter Posts: 14,524

    Ok then.

    The only option is No.1 above: By your ISP

    Please note this external IP is not the internal IP assigned by any of your equipment, ie Router; Modem or computer Mac address.
    This internal IP is only shown to you, and in most cases the exact same IP as just about anyone else with the same Modem/Router ie or whatever the Modem/Router assigns from the DHCP part.

    Mind you, in large business networks, you can assign a unique internal IP to each individual user, ideally making a static workgroup or domain network, so if a user locates for instance, they can go directly to that specific user computer/printer everytime.

    So your question now has changed from "How can I change the Mac Address on a 3800HGV-B router " to: How can I change my external IP Address, of which I originally thought!

    Here's the answer: You can't and not only that, There is no reason to anyway
    But, if for some unknown reason that you must change your IP (ie constant hacking) Then only your ISP can do this, after a lot of pleading! as mentioned earlier.

    The only way is to:
    1. Plead to your ISP, asking for a new IP (Good Luck!)
    2. Change your ISP (this is by far the easiest, as each ISP will have their own IP range)
    3. Go Dial-Up (Guess what? Dial-Up gets a new IP address on every login!!)

    There was some talk on having a personal domain Server, but this is in fact won't work, unless your unique Server is also its own registered ISP (ie No.2 above)

    I have tried to make this info very basic, for you and others reading this.
    If I were speaking to another tech, I would say: Why? Just block the hacker's IP

    Does this answer your question now? (this is where the user (being you) does not reply back - but it would be nice, even just to say thanks, or no not that IP !
  7. raybay

    raybay TS Evangelist Posts: 7,241   +10

    yyiiyyii, you are missing something.

    Before proceeding, I would be sure to understand thoroughly the information here and other published information on MAC addresses:

    http://en.wikipedia.org/wiki/MAC_address and
    http://www.tech-faq.com/change-mac-address.shtml and
    http://www.nthelp.com/NT6/change_mac_w2k.htm and

    but I am not convinced your IP will work with you on it. If you are using a commercial IP, you might want to look carefully at your contract.

    I don't believe that meddling with the MAC address is where one should want to place their efforts.
  8. yyiiyyii

    yyiiyyii TS Rookie Topic Starter Posts: 105

    I called the ISP many times and they wont change it, my isp is At&t
  9. kimsland

    kimsland Ex-TechSpotter Posts: 14,524

    The real question is Why do you want it changed?
  10. raybay

    raybay TS Evangelist Posts: 7,241   +10

    I agree. I just cannot figger out why you would want to change a MAC address, for all the trouble it will cause you, continually. Sometimes I have to do it in Government installations. That is definitely a fun reducer.
  11. kimsland

    kimsland Ex-TechSpotter Posts: 14,524

    You mean you can change Mac address?
    Please let me know, I've already learnt one thing on another thread today, may as well make it two !
  12. raybay

    raybay TS Evangelist Posts: 7,241   +10

    See previous posts above.
    Not recommended unless you have full control over your IP.
    IP folks do not like this change
  13. kimsland

    kimsland Ex-TechSpotter Posts: 14,524

  14. yyiiyyii

    yyiiyyii TS Rookie Topic Starter Posts: 105

    I think that this only changes the mac adrees on your computer not on the internet cable routers
  15. LookinAround

    LookinAround Ex Tech Spotter Posts: 6,491   +183


    Hmmm,... in your many posts (including several different threads) i don't think i've yet seen you answer why you are so desperately seeking a way to change you IP address

    That said, you're in a catch22. It's actually easy to change the MAC address on your 3800HGV-B. Just use a different one. They each have their own MAC address.

    Your problem is i'll bet AT&T won't even talk to a new MAC address until it's registered to your account which puts you right back at square one.
  16. Darncrazy

    Darncrazy TS Rookie

    I know exactly what yyiiyyii wants to do. If you can change your Modem's or router's MAC address , your IPS will typically give you a new WAN IP address.

    There are many reason for wanting to do this. I do this all the time on my Buffalo router which uses a 3rd party firmware which allows me to change the router's MAC address. Comcast's modem will give me a new WAN IP address after I reset it.

    Changing an external IP is great for bypassing downloading limit on website like rapidshare, megaupload, and a whole slew of other file hosting websites. I don't want to wait several hours just to download a 60mb file. Other reason might include having your IP banned from a website for whatever reason. Or you just don't like people being able to track you using the same WAN IP address for a long time. Whatever the reason someone wants to change their WAN IP address, its nice to have the ability.

    Hell, I too have been trying to figure out how to change the internal address of the 3800HGV-B router for the longest time. There doesn't seem to be any sort of way to do that sort of getting another 3800HGV-B, but that's not going to happen unless it breaks down or there is some flaw with the model. If anyone does know how to change the internal MAC address, I'd like to know as well. Save me the trouble of waiting to download files
  17. LookinAround

    LookinAround Ex Tech Spotter Posts: 6,491   +183

    Yes, I know. And i agree all that is true.

    But you guys are only thinking technical. From my view, you;re simply looking at this as a technical challenge when, in fact (i happen to believe) you need look at this as a business problem.

    Would ATT simply open its network and assign an IP address because their hardware sees a new MAC addres? How will they get paid? Who's account does this belong to? When it comes time to printing monthly bills, what rate plan applies for all the data sent to this new MAC address?

    Again, my guess is ATT would wouldn't allow ANY traffic with that new MAC address (let alone assign it an IP) until it can answer its billing questions which means the new MAC address has to get registered to your account which means..... you're back where you started.
  18. raybay

    raybay TS Evangelist Posts: 7,241   +10

    Mebbe so. Mebbe so.
    But no IP I know is going to let you get away with it, for security reasons.
    They will either drop you, or make you pay money for the change.
  19. Darncrazy

    Darncrazy TS Rookie

    I can see what you mean by having problem recognizing the modem because with comcast, if you do change the modem MAC address, you do need to contact comcast to let them associate the new modem to your account. However, If you change the router's MAC address, you can get a new WAN IP address so it still tracks you.

    However, I don't know enough about U-verse's internet protocol to know if changing the combination Modem/Router/Gateway MAC address would screw up the possibility of recognizing your account. U-verse protocol still uses personal information to get access to the internet. Even if it is new hardware you still need to enter in the same personal keycode they give you or whatever the hell it's called for the 2wire gateway to recognizes which account you have. A counter argument to getting a new WAN IP address is that if they know your information then they'll give you the same WAN IP address. However I know they don't because we've already had them change out a faulty 2wire gateway and we got a new IP address. So it is the MAC address of the hardware that seem to change the WAN IP address.

    Since the WAN IP address is related to the MAC address of the hardware It shouldn't matter from their side if you change MAC address because AT&T should always have extra room for new IP address. I suppose U-verse's internet protocol could be different to which it would complicate things, but I don't see why it would be a costly problem to have extra space for allowing new IP addresses being assigned to different hardware.

    But then end result is the same, no one has come up with a way to change the WAN IP U-verse gives you short of having an extra 2wire gateway.

    If changing WAN IP is bad for security reason then PPPoE DSL is the worst protocol ever made. If AT&T charged someone every time a user reconnected to the internet it would be no different than 56k dail-up.

    Comcast doesn't seem care to care if I get a new WAN IP address every time I change my router's MAC Address. How can they? That would be silly on comcast's part not to recognize a new user's router.

    You argument might be valid for U-verse because they don't give you a choice when they give you all in one Router/Modem/Phone/TV unit (which I despise). They probably do want to keep track of a single unit, but they already use your account information from the code they give you...

    And about security reason or making you pay more, they already make you pay more for a static IP address. I actually WANT a dynamic IP address. Plus I don't know what security risk there are assigning new WAN IP address. If anything, I get even more security from not being tracked by the same IP address all the time. Static IP would be useful for webserver use but I'm a home user and don't need that. Anonymity's is what I need
  20. larrrardintx

    larrrardintx TS Rookie

    This would only apply if the MAC address was changed on the modem, however, when you change the interface attached to the modem, you get a new IP address, it is that simple. It worked with Time Warner when I lived in Florida, and it works on Comcast here in Texas. When I was on AT&T DSL, I actually had a tool in the DSL modem that would allow me to arbitrarily change my IP address when I wished. And usually within 30 seconds, I changed the IP address.

    Yiyiyi can use one of those MAC address changers to change his MAC address on his PC, and then use the router's Clone PC MAC Address function to change his router's MAC Address to equal his PC's.. That's what I do with Comcast, and it works just fine. There is only one caveat. You want to use the MAC address changer to change the MAC on the PC to a commonly used card such as a 3COM or a Realtek or Asus Or Nvidia.. Some of those MAC address changers have cards that are not even sold in the US, and in that case, his ISP may not recognize them.

    My ex wife worked for Time Warner Cable, and she advised me that TWC (and Comcast does it too) assigns IP addresses based on the device connected to the modem. So a LAN card gets (here in Texas) a 98.x.x.x. while a router gets a 75.x.x.x IP address. In other states, it would be 24.x.x.x or 65.x.x.x. and so on. It depends on what the engineers assigned to router and LAN card macs.

    Which is why I advise using a MAC address for a card local to where yiyiyi lives

    My 2 cents worth :D
  21. raybay

    raybay TS Evangelist Posts: 7,241   +10

    That is all good and well, but if their system detects the change has been made without their involvement, they will usually shut you off, as it is too much like the piracy that is used in many of our cities these days. I know Cox, for one, would not understand if it were not done in concert with their tech people... differing somewhat on whether it is a commercial or home account.
  22. SevnSins

    SevnSins TS Rookie


    Has anyone found a way to change the IP on a U-Verse gateway yet. I've had TWC, AT&T DSL, and various others, and had no problems changing in the past. From all the different things I've read, it seems to not be possible without changing out the hardware (gateway).

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