trying to change my mac address so I get assigned a new ip

Discussion in 'macOS' started by newmacuser23, Jan 17, 2011.

  1. newmacuser23 macrumors member

    Aug 18, 2010
    I am trying to use telnet to change my mac address I connect to telnet successfully and enter ip ifconfig intf=Dynamic_IP hwaddr=00:??:??:??:??:?? after entering a random combination of numbers where the ?'s are I get the following error.

    Invalid interface name specified.
    Bad value for parameter 'intf'
    Unknown command.

    What am I doing wrong?
  2. mjsmke macrumors 6502a

    Mar 2, 2010
    You cant manually change yout IP.

    What exactly are you looking to do?
  3. newmacuser23 thread starter macrumors member

    Aug 18, 2010
    I am trying to force my router to search for and hopefully assign me a new ip.

    In the link below my ISP says it is possible to do it using telnet and as terminal supports telnet I thought it would work.

    The users in my ISP's forums seem to think they are the ip police and are refusing to be of any help what so ever.
  4. MisterMe macrumors G4


    Jul 17, 2002
    You cannot change your MAC address. If you could, then there is a non-zero chance to change it to a MAC address that is already in use elsewhere on the network. In this case, the network is worldwide.

    More power to the other users on your ISP's forums.
  5. BlackViper macrumors member

    Mar 2, 2010

    It might help if you could tell us why you want to change your IP address. It really shouldn't matter what your IP address is; when it does, you usually want to keep a specific IP, not change it.
  6. belvdr macrumors 603

    Aug 15, 2005
    No longer logging into MR
    You can change your MAC address on most newer equipment. It will not change what is burned into the NIC, but you can change what is presented to the network.

    Also, your MAC address is only visible on the current subnet, not across the entire Internet.

    OP, on what equipment are you attempting to change the MAC? If it is a router, then what is the router's make and model? Another option to try is forcing your equipment to release its IP, and then turning it off for a period of time (say overnight).
  7. newmacuser23 thread starter macrumors member

    Aug 18, 2010
    The make of my router is speedtouch 585 v7 and it is that one I am trying to change.
  8. newmacuser23 thread starter macrumors member

    Aug 18, 2010
    In regards to the equipment I am using I am using a mac pro how would I release the ip If spoofing the mac on the router can't be done.
  9. pmkoch macrumors regular

    Oct 18, 2009
    I don't really know what you are trying to do, but if you are just trying to release/renew an IP you can do this by going to the Apple menu>System Preferences>Network>Advanced>TCP/IP>Renew DHCP Lease.
  10. newmacuser23 thread starter macrumors member

    Aug 18, 2010
    Thanks for that and if possible how would I disguise my mac address to display something different compared to the actual mac.

    Because lease times are extremely long on my ISP releasing the ip and even unplugging the router probably won't help
  11. AshMan macrumors regular

    May 1, 2010
    why can;t you simply tap into the router via its web based interface, then simply release the ip wait like 10 minutes and try to renew the ip should force it to change to another in the range assigned by your ISP.

    for instance, on my ATT speedstream I had, I could simply http://routers IP

    then I could go into the wan connection section and simply release the DHCP ip from the WAN wait a few minutes then refresh it and it would assign me a new IP in the range allocated on my subnet with them.

    Or you could simply turn off your router for 24 hours give or take to ensure the dhcp lease expires and then reboot it and it should grab a new WAN IP at that point from your ISP.
  12. MacAndMic macrumors 6502

    Jun 4, 2009
    DHCP leases are reserved for a pre-determined time, they could be instant releases or could go for weeks, months, years. The marriage if you will is by the requesting devices Mac address, in this case the OP's router.

    When the OP's router asks the ISP for an ip address, the ISP checks to see if there was a previous ip address assigned to the MAC address, if there is, it then it assigns the previously used ip address. This is where lease times come in. If the OP disconnected his router for a longer period than the reservation time the ISP uses, then when he re-attaches, he would then get a new ip address.

    Most likely the OP got ip banned from a gaming or other type of server and is trying to get a new address so he can get back on. I know some routers allow you to mask a MAC address but I do not know if the OP's router has that capability.

    You could call your isp and ask then to manually expire the lease......good luck though on getting through to the right person who actually understands and has the permission to do it.

  13. AshMan macrumors regular

    May 1, 2010
    most dynamic ip ISP connections will expire fairly quickly and renew. my att dsl used to be able to refresh it almost instantly. my comcast cable I had used to expire after 24 hours.

    either way only time I have seen anything longer was a permanent static ip...
  14. newmacuser23 thread starter macrumors member

    Aug 18, 2010
    I am going to try calling them and see if they can do anything the customer service is good so hopefully it will work and as for the reason for the change yes some (insert expletive here) hacked an account of mine and they ban by ip so you can see the problem. My router does not appear to support mac cloning if calling is no use I will probably look at getting a router that does.
  15. bmcgonag macrumors 65816


    Mar 20, 2007
    If it's truly a router / modem, then your instructions will only release the Apple's private IP, not the public IP assigned to the router.

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