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Your ISP DHCP not working - when modem is in bridge mode - can get an ip when not in bridge

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Regular Visitor

Your ISP DHCP not working - when modem is in bridge mode - can get an ip when not in bridge

Hello 

Been getting intermittent drops of internet between my Asus router and Comcast Gateway.

Starting researching and it looks like it may be my gateway is not in bridge mode.  It works fine if the gateway/modem is not in bridge mode and the Asus router is able to pull an IP.

 

Placed gateway into bridge mode - but Asus router will not pull an IP, no matter what I have done to the router.  The only thing that I have not done to the Asus router is factory reset it.

 

Found a similar note in the forum of needing my modem re-provisioned.

https://forums.xfinity.com/t5/Your-Home-Network/Your-ISP-DHCP-not-working/td-p/3239115#

 

Set up is:

asus rt-ac1900p router with two other rt-acc66u b1 router in aimesh network

gateway is a : arris group model tg1682g

 

Questions are:

1) should gateway/modem be in bridge mode?

2) if not in the bridge mode, what more can be done to troubleshoot the intermittent drop between the router and gateway?

 

Thanks for any suggestions.

 

H

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Expert

Re: Your ISP DHCP not working - when modem is in bridge mode - can get an ip when not in bridge

If you are not, you need to power-cycle the gateway (just like a straight cable modem) after placing it in to bridge mode in order for any connected device to be able to obtain internet connectivity.



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Regular Visitor

Re: Your ISP DHCP not working - when modem is in bridge mode - can get an ip when not in bridge

thank - yes alreday did that - after putting in bridge mode the gatetway/mode was reset - and it still did not provide an IP for the router

 

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Expert

Re: Your ISP DHCP not working - when modem is in bridge mode - can get an ip when not in bridge

We've seen a number of posts about the same thing here lately. Me thinks that it's a firmware bug.



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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? Mark the post as Best Answer!
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Re: Your ISP DHCP not working - when modem is in bridge mode - can get an ip when not in bridge

So the weird part is -

1) the router will connect when the gateway/modem is not in bridge mode. - its just that we end up with double nat - and need to turn off the wifi to reduce interference.  performance has not been an issue but we get the intermittent drop between the router and the gateway - just watching it say disconnect / your DHCP msg . . .   now the drops may nothing to do with bridge or not.  And could be something else.

 

2) tried a different factory reset asus router with the latest firmware from ASUS - and was still getting the same issue - in bridge mode.  No DHCP IP.

 

3) bridge mode shows no devices connected - though my PC - which was used to set the bridge mode is connected, and can get IP/internet (how am writing on the forum)