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Ghost1111
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Saturday, November 13th, 2021 6:40 PM

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New Router not getting IP address from Modem

I am replacing an TP Link 450M with a AC1750. The new router is not getting an IP address from the modem; Zoom 5370. I first thought that the "internet" port was bad on the 1750. This is not the case. I "hard reset" the modem. I tried MAC Clone; "Use the current computer's MAC Address"  I also can not communicate with the modem directly connected with a laptop for more then a minute before dropping the IP. Only with the "old" router am I getting and keeping an IP. Does Comcast require the router's MAC address? I can't think of anything else that would cause this. Comcast was less then helpful last night. Thanks for any help or insight that may be offered.

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3 years ago

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EG

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107.1K Messages

3 years ago

Are you power-cycling the modem each and every time that you change the device that is being connected to it ?

Did you power cycle the modem after you cloned a different MAC address into the router ?

Proper power-cycling order;

  1. Shut down all computers connected to the router.
  2. Power down / unplug the modem and the router.
  3. Allow them to sit for 60 seconds unplugged.
  4. Plug in the modem first and allow to completely boot up until the indicator light(s) on it show a steady connection (lit steadily).
  5. Plug in the router and let it fully boot up and sync with the modem.
  6. Start the computer and allow it to completely boot up.

Any joy ?

(edited)

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Ghost1111

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@EG Good Morning. I am Power Cycling each time I change the devise and after I clone a different MAC address. In talking to Comcast Tech Support again this morning, they assure me that they don't require the router's (or whatever devise that is connected to the modem) MAC address. I can only conclude that there is some kind of issue with the modem itself. Why only the old router, and not anything else, will get an IP address is odd.      The power seems low on the downstream, but the SNR seems ok. Neither would cause the issue I am having.                                                                

Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables
1 Locked QAM256 29 627000000 Hz 5.9 dBmV 41.1 dB 0 0
2 Locked QAM256 25 603000000 Hz 6.2 dBmV 41.4 dB 0 0
3 Locked QAM256 26 609000000 Hz 6.0 dBmV 41.3 dB 0 0
4 Locked QAM256 27 615000000 Hz 5.8 dBmV 40.8 dB 0 0
5 Locked QAM256 28 621000000 Hz 5.8 dBmV 41.0 dB 0 0
6 Locked QAM256 37 675000000 Hz 4.9 dBmV 39.8 dB 0 0
7 Locked QAM256 30 633000000 Hz 5.8 dBmV 41.0 dB 0 0
8 Locked QAM256 31 639000000 Hz 5.6 dBmV 40.7 dB 0 0
9 Locked QAM256 32 645000000 Hz 5.3 dBmV 40.5 dB 0 0
10 Locked QAM256 33 651000000 Hz 5.3 dBmV 40.5 dB 0 0
11 Locked QAM256 34 657000000 Hz 5.1 dBmV 40.3 dB 0 0
12 Locked QAM256 35 663000000 Hz 5.0 dBmV 40.3 dB 0 0
13 Locked QAM256 36 669000000 Hz 4.9 dBmV 40.3 dB 0 0
14 Locked QAM256 38 681000000 Hz 4.8 dBmV 40.3 dB 0 0
15 Locked QAM256 39 687000000 Hz 4.6 dBmV 40.3 dB 0 0
16 Locked QAM256 40 693000000 Hz 4.6 dBmV 40.3 dB 0 0

3 years ago

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EG

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107.1K Messages

3 years ago

The downstream power is actually on the high side of zero but it is in spec. The SNR's are also good. As you said the RF power levels are not related to your issue.

AC1750 is not a make or model number. Is that an Asus brand router ? 

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Ghost1111

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4 Messages

@EG  It is an TP Links Archer C7 AC 1750.

3 years ago

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EG

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107.1K Messages

3 years ago

Hmmm..... I'm not certain what the problem could be, sorry. Perhaps someone else may chime in here with an idea. Perhaps equipment swapping is in order ? Good luck with it ! Please post back with the solution if you get one, thanks.

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Ghost1111

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4 Messages

3 years ago

Thanks. I will. I am going to get a new Modem. I don't know how else to proceed otherwise.

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Elprez

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@Ghost1111​ Did you ever resolve this? I have worked fine with my netgear router and the Arris gateway in bridge mode. Yeasterday morning......it was not getting an IP. Spent all day working and even reset the router and tried 2 other routers with no luck. Finally ordered a modem only used from Amazon and it is supposed to be here today. 

3 years ago

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EG

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107.1K Messages

@Elprez 

Please create a new topic of your own here on this board detailing your issue. Thanks. The original poster has not returned. 5-month-old dead thread is now being closed.
 

I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.

Was your question answered? Please mark an Accepted Answer!tick

3 years ago

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