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I purchased a T25 modem to replace the Xfinity Xfi. 

I have internet connection from T25 lan port to a pc, but not when T25 is connected to my router. 

I reconnected the Xfi. Every thing works!!!

What am I doing incorrectly for the T25 not to connect thru router?  I had a Xfinity tech out today helping. He don’t know either.

The T25 has 2x ethernet ports. But xfinity only supports 1 device connected to the modem. 

so do this. 

Power off the modem and the router. Leave them off at least 2 minutes and disconnect the coax from the modem. (disconnect ethernet cables from router too). 

Then connect the coax back to the modem and power it on. wait 2 minutes. 

Then connect port 1 on the modem to the wan port on the router. 

Power the router on. 

wait 2 minutes. 

Attempt setup on the router. 

 

Again, don’t connect anything else to the modem. Xfinity only provides 1 public ip address and if thats assigned to the other device, the router won’t work. 

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