Many customers who happen to get issued a 10.x.x.x IP address from Americable experience an issue with the Xbox one that gives them a “Strict NAT” error. Below is a link to help resolve the issue.
http://forums.xbox.com/xbox_forums/xbox_support/f/9/t/157383.aspx
If you are still experiencing issues after trying the options from Xbox, please contact Americable technical support so we can assist you in resolving this issue.