Regular Visitor
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14 Messages
ASUS AX86U ISP DHCP Not Working
I had this issue this morning with my internet being down. I searched this forum and saw several threads about causes and solutions. I tried many of the solutions and none worked then I tried one more item and it worked. I am documenting here in case someone else has the same issue.
Searching the forums you will see numerous posts about ISP DHCP issue with ASUS routers. Some saying the DEFAULT method of AGGRESSIVE is the culprit. I tried changing mode to Normal and Continuous but with same results. I tried using MAC Clone and it also did not work. I did numerous power cycles between Modem and Router.
The issue was isolated to the comcast modem when I hooked Directly to the modem with my laptop. I power cycled numerous times but I would never get an IP address other than self-assigned in the 169.x.x,x range. I then decided to manually enter ip address and used 10.0.0.2 with mask of 255.255.255.0 for address with Router at 10.0.0.1 This allowed me to log into Comcast Modem. Once I added a DNS entry of 8.8.8.8 I could browse the internet on laptop. I still could not get DHCP to work.
I then took the Comcast Modem out of Bridge Mode temporarily and it showed the laptop connected as the only device. I then switched the Bridge Mode back ON and it continued to work. I swapped the router cable back in and it still showed as OFF even with reboot but then I went and added the MAC address from Laptop to router and it all started working again.
I am not sure how long this will last but it appears to be an issue on Comcast side with something getting blocked from DHCP in Bridge Mode. You can fake it out with getting one device working and using that MAC on router.
Jlavaseur
Problem Solver
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948 Messages
3 years ago
I have that same router, there should be a link on routers admin page to fix it, or just redo the connection setup with the router, 2 minute fix…
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Jlavaseur
Problem Solver
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948 Messages
3 years ago
So in bridge mode on the gateway, it’s just a modem, no dhcp, the modem should have the ip 10.0.0.1, in standard mode, when you connect the router, you create a double nat situation..
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Jlavaseur
Problem Solver
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948 Messages
3 years ago
So if you set the router to obtain a ip automatically, use the router wizard to create a new connection it will probably work, if you have the router set with a ip 10.0.0.1 and the gateway/modem default ip is the same, obviously a problem….
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Jlavaseur
Problem Solver
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948 Messages
3 years ago
It worked several times for me and a couple of friends, I am sure you rebooted the gateway and router for the changes to take affect… whatever works for you…
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user_40c3b2
Visitor
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14 Messages
3 years ago
I am having this issue as well, ASUS AX11000 router. My internet randomly went out this morning while playing a game and reported this error in connection settings on my router. I did what you suggested and the MAC address spoofing worked. Nothing else worked. Tried just about everything I possibly could. This person giving you the typical turn it on and off again response has reading comprehension issues I guess?
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user_40c3b2
Visitor
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14 Messages
3 years ago
So I was able to get connected again without spoofing my computer MAC address. I hard reset the xfinity modem/router with my router connected and was able to reach my modem IP through my router. I set bridge mode while connected through my router and it worked. Spoofing my computer MAC kept reseting in the middle of the night for some reason. Hopefully this sticks.
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user_40c3b2
Visitor
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14 Messages
3 years ago
So my internet dropped in the middle of the night again. I havent had problems for years and now all of a sudden last Monday it started doing this. Works great all day no problems then just loses connection in the middle of the night and I have to go through reseting and setting it up again. Not sure what else I can do. I tried setting the DHCP query to Normal and it did not work. I guess I need a new modem or something.
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user_6eb284
Visitor
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2 Messages
3 years ago
Following. Having the same issue for my RT-AC86U. Happened randomly after one day then when the tech came to fix the issue, it happened again after schedule Xfinity maintenance in the area…
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user_40c3b2
Visitor
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14 Messages
3 years ago
Settting the DHCP query frequency to Continuous seems to have fixed this issue for me. I did not lose internet in the middle of the night like I have been.
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user_40c3b2
Visitor
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14 Messages
3 years ago
So this issue is still happening. We had a tech come out and he changed the splitters but because the numbers look fine he cant really do anything else so we had him order a replacement modem. Hopefully a new modem will resolve this issue.
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