I'll start out by saying that I've had Comcast service in the Twin Cities area for quite a few years and I've not had any major issues with them. I had Time Warner in Minneapolis prior to the Comcast buyout of them, then Comcast home service (now Xfinity), then Comcast business class internet service, which is what I have now.
When I got the business class internet, I suddenly realized that I no longer had a public IP address. With Xfinity, I always had a 75.x.x.x IP and now I ended up with a 10.x.x.x IP. I called tech support and they informed me that I needed to have a static IP, which is an extra cost - $15/mo, to be exact. This is ridiculous. I called them numerous times but I can't get anyone to understand what I want. I don't care about having a static IP. What I do care about is having a public IP, one that can be reached from anywhere on the internet. With a 10.x.x.x IP, I'm essentially double NATted and I don't want that. When I moved to a different house last month, I got a shiny new Cisco DPC3939 cable modem and I asked the installer about it and he didn't seem to know, either.
How can I get Comcast to understand that I need a public IP but don't want a static IP? I use dynamic DNS to get me back home and I'd rather spend that $15/mo on something else more useful.
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Thanks for the info. That's what I have figured out by doing some research, but I wanted to be 100% sure. I am able to login to my Cisco cable modem and change it to bridge mode myself. Then all I will need to do is call Comcast and have them cancel my static IP. I'm sure that will be fun...