This threat arises when the user does not have any information about the originator of the message. One of these attacks includes message authentication.
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How and why are you getting DDOS'd? Are you running a game server or other web server? Is someone just doing this for fun or did you piss someone off? I would ideally reset the MAC Address back to the original as well. You need to call Comcast (on the phone) and get them to assign a new IP Address to your Modem. That's a bandaid solution to a gunshot wound. You should have never changed the Modem MAC Address to begin with. Bad wording, I was DDOS'd for around three days on the initial IP I had (I fought it by monitoring and blocking the ports they used and watching their port scans, but got annoyed doing ti every day), which made me change my external IP address by making its MAC off my gaming PC, and since comcast hands out your external IP based off your routers MAC address (which my router no longer responds to), I got it changed, which gave me a new external IP which I have been using for 2 months up until this morning with these random new external IPs started getting assigned (and also ignoring any MAC changes to my router changing my router to be a static external IP to the old external IP that was working fine simply makes me lose internet and doesnt work)