Internet good off modem, not router, losing my mind here

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Reffetsevla

Commendable
Aug 10, 2016
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So recently my ISP did some work on the pole outside, about 5 days ago. Few hours after I started losing connectivity on my network until everything was down. So I rebooted, the equipment. Modem, router, devices, still nothing. So in the spirit of isolation I connected my PC right off the modem, internet without issue. Full speeds, no concerns. Anytime I connect a router, it all dies. It seems like too much of a coincidence that the pole work did not impact me, but the only thing I can think of is that when they provisioned the new circuit something got jacked on mine, but the ISP apparently isn't seeing an issue.

Some more info, when I do not have the modem connected to my router, I am able to pull a private IP from the router via DHCP without issue. As soon as I connect the modem to the router I begin getting the 169. IP's on my devices. I've tried 3 different router, one brand new, two different modems, I even tried just running a switch off the modem but once I found out I don't have more than 1 publicly routable IP that obviously wasn't going to work.

I'm sure there's more I've tried I haven't put on here but any suggestions would be wonderful. I've factory reset both the routers and the modems to try and remove any erroneous settings.

Thanks!!
 
Solution
Ralston18
Is this your router?

http://www.pdf-manuals.com/pdf/tp-link-archer-c5-ac1200-wireless-dual-band-gigabit-archer-c5-346663-user-manual.pdf

Doublecheck your configuration via the diagrams and the LED indicator light displays (Page 4) to see if everything is as it should be.

You mentioned "resetting" - do you mean the full factory reset as shown on Page 115?

My suggestion is to start over anew via a reset, and use the manual to reconfigure the router as you require. Follow the steps carefully and watch the indicator LEDs as warranted.

Then use Appendix B to reconfigure the PC thereafter.

Do not mean any discourtesy but it is difficult to unravel the end results of everything that you have attempted thus far. Especially if there is...
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Ralston18

Ralston18

Titan
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Oct 11, 2014
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169 IP's are what Microsoft Windows assigns when it cannot otherwise obtain an IP address.

What is your incoming connection to the modem (coax, ADSL)? What make and model modem is it? Or is it a modem/router?

Then there should be an ethernet cable from the modem going the the router's WAN port.

If you have been doing factory resets, it can take some time for the various devices to reestablish the network communications between themselves. And if there is some conflict between default configurations (e.g., two devices playing DHCP server) then all sorts of problems result.

I think you have demonstrated that the modem is working at least with respect to internet connectivity. Make sure that is DHCP functions are off.

Factory reset the router of choice and use the User Guide/Manual to reconfigure it for your network via the administrative web pages.

Watch the modem and router's LEDs to follow the handshaking process. Most such devices provide a series of colors and flashing to indicate what is going on and status. Again it may take a few minutes for each part to sucessfully complete. If not there should be a error message of some sort.

Read the respective User Guides beforehand and plan out your actions. Work methodically and keep notes.

Try to make only one change at a time and if unsure, back up a step, and start over.



 
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R

Reffetsevla

Commendable
Aug 10, 2016
2
0
1,510



Thanks for the input! I have tried all mentioned methods, resetting, making sure to wait enough time for everything to drop ARP or request a new IP, it's like once my router is connected to my modem, my DHCP pool just disappears and since the modem doesn't have a DHCP pool, it just dies there. Almost like the modem is TRYING to do NAT/DHCP but nothing is defined, but it's enough to override my router. Frustrating to say the least.

Bigger issue I have is regardless of whether my router is connected or not I cannot access it, even when DHCP pulls fine and I have it off the modem, I recognize the network, I try to access 192.168.0.1 (default gateway so it should be my router) I just time out.

Modem is a TP-Link 7610
Router is a TP-Link AC1200
Charter is my ISP - Coax (signal strength is good at the modem)
Couple 8 port Gigabit TP-Link switches as well but those are out of the network until I can get this stablized and functioning.

Thanks!
 
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Ralston18

Ralston18

Titan
Moderator
Oct 11, 2014
34,976
3,340
146,290
Is this your router?

http://www.pdf-manuals.com/pdf/tp-link-archer-c5-ac1200-wireless-dual-band-gigabit-archer-c5-346663-user-manual.pdf

Doublecheck your configuration via the diagrams and the LED indicator light displays (Page 4) to see if everything is as it should be.

You mentioned "resetting" - do you mean the full factory reset as shown on Page 115?

My suggestion is to start over anew via a reset, and use the manual to reconfigure the router as you require. Follow the steps carefully and watch the indicator LEDs as warranted.

Then use Appendix B to reconfigure the PC thereafter.

Do not mean any discourtesy but it is difficult to unravel the end results of everything that you have attempted thus far. Especially if there is some problem masking the truth of things.
 
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