I have been trying to work through the Mediacom forums, but responses are slow (and terrible). Here are the thread link (hxxps://forums.mediacomcable.com/index.php?topic=33412.0) and info:
Me to mediacom:
It is a computer. I have rebooted many times. I also set the ip to what it had before and it didn't work. I ran tcpdump on the interface plugged into the modem and see dhcp requests, then dhcp discovers, then it waits a while and starts over. It is not getting a dhcp response at all. I changed the MAC address on the interface and tried it all again. No responses. I see a lot of arp broadcasts from the cable modem wan side, so I know the cable modem sees traffic from you. For whatever reason, your dhcp server is not handing out an address. There really isn't any more I can do on my end.
@MediacomChad - can you help please?
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