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Comcast's dynamically assigned IP's are what as known as being *sticky dynamic*. Why do you need it changed ?
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If you have a router that has a MAC address cloning feature, you can clone a different MAC address in to it. This will force their DHCP server to assign a new / different public IP address to your connection.
The Comcast supplied gateway devices do not have this feature.
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You can try but don't hold your breath. Good luck !
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No. As stated, the MAC address of the device would need to be different. Their dynamic IP are tied to the MAC address of the router.
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