Normally I would totally agree with you and that is the way that I always set up my previous gateway. However, xFi is a different animal. On Xfinity servers it knows the local DHCP address of every device. If you change it via 10.0.0.1 it will not be reflected on the web management app. I wonder if the sync between the gateway and the web app is bi-directional. If not, any assignment is essentially static on the web, including their port forwarding, since the web does the forwarding and not the gateway.
I wish someone from Xfinity would just explain exactly how the connection between the web and the Gateway works. I think that it is such a change that all of us are doing things that would have worked in the regular gateway days and complaining that they no longer work.
Port forwarding does work when setup on the web app, but right now I cannot get it to forward using my DDNS URL and I must use the explicit outside address of my gateway.
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I am trying that as well. The whole XfI system is strange and hard to get your head around. I have two internal servers that are used for smartphone household management. Before XfI is was trivial. Now, not so much. I would love to get a technical explanation of what they are doing. It appears that everything is now managed from the site and the gateway management app, although accessible locally, changes things but they don't take. Right now I am concerned about static IPs. IF the central server caches all IPs and assigns names and other things to them, does this mean that all DHCP IPs are now static, since the gateway cannot make its own changes without getting xFi out of sync?
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