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I have problems using IPV4

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I have problems using IPV4

A few days ago my VPN stopped working. The IT in my firm told me that I need comcast to steup my router to be able to work with IPV4. Talking to xfinity support today they told me it's impossible and comcast will not support this protocol anymore. Is this true? I'm confused. I saw that there might be experts here that can help with this. Any help will be greatly appreciated. I could also help after I have an explanation others in my firm. Many people are going to have this problem. @ComcastJohnN  @ComcastChe