Ethernet to PC using att uverse

How is the "U-verse Cable Box" (by which I assume you me a U-verse TV Receiver) connected to the Gateway?  Is it by coax cable or Wireless? 

If coax cable, then you can indeed connect an Ethernet cable to the RJ45 jack on the back of the receiver and connect your PC that way.  Keep in mind the following:

• This is not officially supported by AT&T
• The HPNA over Coax link has a limit of about 120 Mbps.  Your actual bandwidth limit may be lower due to quality of the coax/connections/etc.  BTW, since this is a bus, this is total, both directions (not each way).
• If you come anywhere close to the limit in usage by your PC, you can negatively affect the U-verse TV performance for anything involved with that coax cable (including recordings if the DVR is connected to the Gateway via coax).

Glad to hear @JefferMC was able to answer your question, @ktoporek! 

If you have any other questions, just let us know! Thank you for contacting AT&T Community Forums! 

Raiden, AT&T Community Specailist 

I recommend Ethernet from your Gateway to your gaming pc if possible. It sounds as though your Gateway and Uverse box are in the same room and it is possible to run Ethernet from the Uverse box to the gaming pc, so Ethernet from the Gateway to the gaming pc is likely doable. I maintain separate Ethernet/Ethernet switch branches for TVs and pcs. As noted previously, if coax cable is a part of the equation, separate branches of the network architecture are really essential. I have not experienced noticeable degradation with 1000 Mbps service.