No way to disable this on their side. If they updated to IPV6 its is there to stay.
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Comcast Business Gateway User Manual Comcast's IP Gateway is all you need to take advantage of a static IP and built-in firewall by following the instructions in the Comcast IP Gateway User's Guide. The Business Wireless Gateway provides both public and private WiFi for your Download a copy of the Business Wireless Gateway Quick Start Guide (Adobe.
Comcast Business Gateway Static Ip
Instead of server why didn't you just create loop back rules ?
I can guess some of your behavior.
Comcast Modem Access Ip
1. You are getting spoof warning ?
Cable Modem Ip
If you are getting spoof warning turn on IPV6 on the device the mobile devices are trying to connect to. Here is the skinny. You see this mainly with IPAd and Iphones with data connecting to both the wireless wlan and the provider. It is a symptom of dual homing one being a IPv4 and ones being IPv6. User guide manual. So try enableing IPv6 on the item these devices are trying to connect to.