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Wifi not working after cloning MAC for new IP


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#1 skeevus

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Posted 19 November 2012 - 12:00 PM

Hello,

I am attempting to get a new IP address from Comcast by using the MAC cloning/spoofing feature of my cable modem/router which is a Motorola Surfboard SBG6580. I'm using the MAC address of one of my hard-wired PCs and I am able to get a new public IP from Comcast but the problem is that once I get a new IP only my hard-wired (ethernet) PCs are working. None of my wireless devices (laptops, smartphones, etc) will resolve any webpages. They are able to connect to the wifi network SSID but have no internet connectivity.

Things I've tried after getting the new IP via MAC cloning:

1. Setting up a new wireless SSID and WPA key in the router and wireless devices
2. Removing all previous wireless network configs from laptops and other wireless devices
3. ipconfig /release and ipconfig /renew
4. uninstalling and reinstalling hardware wifi adapters from device manager
5. tried to resolve websites via their IP to elimate DNS possibilities (IPs wouldn't work either)

None of these things have worked. Once I go back into the router config and zero everything out (to obtain the default router MAC) I re-acquire my original IP from Comcast and both wired and wireless devices work fine. I need to be able to obtain a new IP from Comcast but also need to have my wifi working. Any thoughts? Advice of any kind is appreciated! Thanks!

Brian

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#2 jhayz

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Posted 20 November 2012 - 12:39 AM

Why do you need to clone MAC address when you can use the straight forward DHCP settings?

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#3 skeevus

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Posted 20 November 2012 - 10:39 AM

I thought that the only way to get a new public IP from Comcast was to connect to them through a new hardware MAC address so you would have to clone another MAC, being that Comcast uses semi-permanent DHCP addresses that are associated with your MAC address. If there is another way to get a new public IP from Comcast I'd appreciate it if you could point me in the right direction. Thanks.

Edited by skeevus, 20 November 2012 - 10:40 AM.


#4 jhayz

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Posted 22 November 2012 - 12:57 AM

All ISP modem/routers have these DHCP server as a common setup even if you add another router access point. The network device would assigned a different DHCP IP address to all connecting computers. http://whatismyipaddress.com/dhcp

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#5 uByte

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Posted 22 November 2012 - 10:30 AM

The Cable box will assign one IP from its pool based on the MAC thats connected. I would unplug the cable modem for 10-15 minutes then plug it in again and see if it assigns another IP. Cloning the MAC would be helpful as well (also trying a different MAC then what you have already tried).

uByte




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