I'm a recent xfi 1gb user (got the right gateway after being mislead that my 400Mb/s bandwidth was all I would get for a 1.5yrs) and was trying to add a port forward through xfinity xfi like those above but it keeps adding the wrong ip address.
When I look at the device information in xfinity xfi web portal it shows the correct ip address, but when I select that device during the port forward it creates a port forward for an ip address I do not see in use in my gateway's admin interface. I already reset the gateway (not to defaults) but the issue remains.
I would have expected a way to input ip addresses manually in the xfi web portal by now.
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