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I would like to know if it is possible to create a direct connection from an XFINITY gateway (the router/modem combo) to a PC hooked up directly to the modem.

For example: so that it didn't give my IP a private IP address but a public one, and so I could renew my public IP address easily.

This was possible with my old DOCSIS 2.0 modem, but I want to know if it's possible with the XFINITY modem.

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    If only one PC is connecting to the router (and its hardwire ethernet, not wifi) you could ask comcast to put your modem/router in bridge mode. Asking for that is hard tho, because the average call taker doesn't have a clue what you are talking about. I've asked comcast for bridge mode before and succeeded in getting it done (in my case it was to avoid double NAT because I needed a specific router for a specific reason). – Tyson Jan 2 '16 at 2:28
  • The better way is ditch the xfinity hardware and supply your own DOCSIS 3.0 modem, without a router. – Tyson Jan 2 '16 at 2:33
  • @Tyson Awesome, thanks Tyson. Changed it in the router settings to enable bridge mode and now it is a public IP. – Kirill2485 Jan 2 '16 at 4:10
  • Nice you could get to the setting. It used to be hidden from the customer on Comcast provided equipment – Tyson Jan 2 '16 at 4:19
  • @Tyson You might want to convert your comment into an answer ;) – DavidPostill Jan 2 '16 at 14:32
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If you have a Comcast provided modem/router, and you are only connecting one computer to it via a hardwired Ethernet connection (not wifi), then you may be able to log into the web interface for the device (try http://192.168.100.1) and see if you can find a setting for bridge mode. If you can that's what you want to do, your computer will the obtain the public IP rather than a private IP.

If your Comcast provided equipment does not have a Bridge Mode setting, it is possible to get Comcast to set this for you. I wouldn't take the 1-800 number as the route to request it tho, the calltakers usually have no concept of what you're asking for. Instead use the Comcast Support forum and PM one of the mods, or try twitter @ComcastCares

Not part of your question, but advise I'll give anyway: If you have a Comcast owned internet modem or internet/phone device, stop paying the rental fee and buy your own. The payback is 9 months to 2 years depending on your choices. With phone service there are fewer choices, but the Arris combo units are available on amazon. With no phone involved just buy a DOCSIS 3.0 (or 3.1) cable modem and if needed a separate router. (I prefer separate devices because troubleshooting and upgrading over time are less complicated.)

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