Debugging your Comcast routers


Here are the tricks as I had a major outage...

1. Reboot the router and cable modem and if you have an Apple router, use the Airport Utility to see if it is up and what it is complaining about. If the internet is down, it will complain or say there is no DHCP server.

2. Check to see if you can see your router, it has the magic address and that should give you a web page. If you can see it, you want to see if the 54dBM upstream is the key parameter 

Freq/Power: 609.000 MHz 12 dBmV  
  SNR:  28 dB  
  Modulation: QAM256  


  Freq/Power: 37.000 MHz 54 dBmV  
  Channel Type: DOCSIS 2.0 (ATDMA)  
  Symbol Rate: 5120 kSym/sec  
  Modulation: QAM64

3. If you don't see this, check to see if your cable TV is working, if not, then you have a big outage and call 1888COMCAST

4. Ask them if they can see the router and then they can hard boot it. 

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