Your IP is dynamic, so you will keep that IP until comcast ran out of ip's and refreshes their system, giving you a new IP and reallocating your old one. You could get a new IP every day, every week, every month, or every year. It all depends on their system. But, your IP is dynamic.
You can force yourself to get a new IP by doing a router MAC ID clone. You would need to find the MAC ID of your network adapter, then in your router settings under MAC ID Clone, set the MAC ID as your network adapter, and then get a new ip and reset it.
The reason the above works is because if there is a new mac ID, comcasts DHCP server sees it as a new computer/router connecting and gives it a new IP.
I just recently had my IP changed. I had my previous IP for about a year.
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Just curious, if the dhcp client request a renew ip from the server, before the expired lease. DOes the the client nic keep the same ip ? I am thinking about this trick to keep the same ip.
I belive the ip got change, because when your lease expire from the server, and the client did hot request the new lease before the server give your ip to some one else, that why you get the new ip address. To work around, I think we should request new ip before the lease is expire.