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jmnsea
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8 Messages

Mon, Oct 12, 2020 8:00 PM

Your ISP's DHCP is not functioning properly - ASUS router

Heya, 

 

Exact same issue as: 

https://forums.xfinity.com/t5/Your-Home-Network/Your-ISP-s-DHCP-is-not-functioning-properly-ASUS-router/td-p/3331178

Gateway in bridge mode. 

Asus router "Your ISP's DHCP is not functioning properly "

 

Could you reach out to proceed to the same change? 

 

Let me know if you need anything.

 

Thanks,

Jimmy

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Accepted Solution

jmnsea

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8 Messages

7 m ago

#Solved

 

- I turned on the bridge mode on the gateway

- I unplugged every cable on the gateway

- I rebooted the gateway

- I let the gateway live for an 1h without plugging anything to it

 

In parralel, 

- I rebooted the router

- Made sure DHCP was in "Normal Mode"

- Turn off the router during the 1h wait

 

After 1h, status was: 

- Gateway in bridge mode for an hour without anything plugged during this hour (logic was to not get any DHCP lease and got comcast router dropping any existing one)

- Router turned off for 1h (no reason here, at least I knew it had a fresh start)

 

-- 

I turned on the router, waited that it was fully up.

Plug eth0 from the gateway to the WAN port of the router

Got the ISP message error at first and after few seconds, maybe 20, got my WAN ip assigned to my router. 

 

-- 

Since then, I unplugged/replugged WAN and got my IP re-assigned.

 

I would imagine that the solution here was to keep everything offline to trigger a different behavior on comcast router. 

 

Good luck 

jmnsea

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8 Messages

7 m ago

Confirming what have been done already:
- firmware updated on router + gateway
- many reboot on both of them in different order
jmnsea

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8 Messages

7 m ago

Ping @ComcastChe 

pcmodem

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13 Messages

7 m ago

jmnsea

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8 Messages

7 m ago

Thanks for your message @pcmodem ! 

I tried your procedure without success. 

 

Also something I should mention, I don't have DHCP issues on my clients (computer/tablet etc). The DHCP issue is on my router linked to the Gateway in bridge mode. 

I expect the Gateway to offer my router access to WAN and I expect the comcast router to assign an IP adress to my router, which is not happening. 

I know my gateway has access to internet as I can ping comcast.net via the debugging tab when accessing 10.0.0.1 via Ethernet (manual ip 10.0.0.2 on my laptop). 

I spent 1h today trying to pass the first tech level, they transfered my calls 3 times and I had an argue with the last person as it wasn't a comcast issue when listening to her (she didn't even try to understand the problem as she was working at comcast for a long time, lol). 

I will hope for @ComcastChe to see this message and help me reprovision this DHCP lease. 

 

If anyone has any other idea please reach out. My cameras are not working due to the Double NAT for now. 

pcmodem

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13 Messages

7 m ago

Thank you for the feedback I'm sorry I was not able to be of help, the DHCP lease sure looks like the main problem.

jmnsea

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8 Messages

7 m ago

Thanks, spent 2 additional hours today trying to explain the problem with xfinity support without success. 

@ComcastChe you are my last chance. 

 

Will revamp this thread every week until someone can look into it. 

 

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