About two months back my mother called me and said her cable company wants her to buy a DOSIS 3.0 compatible modem. My mom is pretty good with tech but she asked what modem she should purchase. I left her instructions fairly vague and told her to order any DOSIS 3 compatible modem from Amazon or eBay.
She ended up purchasing a SMCD3GN2. It arrived fine, however the device defaults into gateway mode. This creates a double NAT. This is sort of an issue for me as prior I dropped an ASUS router into my parents house with a VPN server that I could get logged into from my house. I could forward ports from one to the other, but this is messy. I want one device for boarder network control.
When you go to configure this modem/gateway all the documentation says use login cusadmin/password for default. This is fine but it doesn’t give you many options. You have very little control over the device and can’t even disable the gateway/modem mode. You can’t configure what IPs the device issues.
I did some searching and found another login
username mso with the password msopassword
This unlocked all the settings of the gateway/modem and I was able to disable gatway mode.