https://www.snbforums.com/threads/a...or-isps-dhcp-did-not-function-properly.61907/Nice to know, thanks! Today my connection went down during web-browsing and the same old message in the log "WAN Connection: ISP's DHCP did not function properly."
https://www.snbforums.com/threads/a...or-isps-dhcp-did-not-function-properly.61907/The "workarounds" I found on forums don't seem to work. I suspect the router is pinging too often and cause the ISP considering it some kind of attack. I have a dual WAN setup. Once I changed network monitoring from Ping to DNS Query, the problem is gone.
Changed dhcp query frequency to normal form aggressive see if that helps it works for me.
I have changed my configuration to a double NAT scenario where I disabled everything (dhcp, wifi, etc) from the cable modem and forwarded all traffic to my Ac1900.
This has now been running stable for a week now..
It's this bridge mode setup that's trouble. But running double NAT is less than ideal..
Really hope that Merlin or anyone else can figure out what the problem is.
Maybe a more granually settings based WAN dhcp mode? You know a manual setting of the dhcp pool frequency rather than just two settings?
What kind of connection, on mine I'm using a third party router in bridge mode I'm running VDSL 2Just bough ASUS RT-AX88U a couple of weeks ago and already had this issue 2 times. Has anyone tried to disable DHCP on provider's router and use static IP intead? I have not found this in this thread.
If ISP's modem/router is running in bridge mode it is not possible of course.What kind of connection, on mine I'm using a third party router in bridge mode I'm running VDSL 2
Don’t disable DHCP unless you are paying for static IP address. Go to WAN settings and make sure DHCP query frequency is set to normal.Just bough ASUS RT-AX88U a couple of weeks ago and already had this issue 2 times. Has anyone tried to disable DHCP on provider's router and use static IP intead? I have not found this in this thread.
I am afraid there is a misunderstanding here.Don’t disable DHCP unless you are paying for static IP address. Go to WAN settings and make sure DHCP query frequency is set to normal.
Definitely static on ASUS to ISP router.2) From ISP router to my Asus
(...)
For some reason Asus router cannot renew the IP address in its WAN interface (though other devices on this segment in my case can do it) which means that DHCP2 Client is not functioning properly.
If that is so, let us not use this faulty client and instead assign static IP address here which I did.
(...)
Yes they are all aware of it. There is no official guaranteed fix and I doubt one is coming. I don’t think they identified the precise cause. Some people report the issue disappeared after changing one setting or another, such as changing dhcp from aggressive to normal or continuous mode. They’re lucky. I’ve tried everything and nothing has worked. The problem always returns. I wrote a script which runs every minute to ping google and if ping fails restarts the WAN interface.Does anybody know if the ASUSWRT-MERLIN firmware's developers are aware of this?
So, 10 days passed since I did the change and the issues did not re-appear. Hope it is resolved in my case though I will continue monitoring.
To explain better what was done I have drawn the diagram which I attach here.
Some explanations to it.
First, I want to emphasize that the below is true ONLY for the case when ISP’s device at your home is running in ROUTER mode (and not as a bridge).
Having said that you will have 3 DHCP instances (Server-Clients) on the way from ISP to your home end clients:
DHCP1 – ISP issues IP address and ISP’s router gets it on WAN interface
DHCP2 – ISP’s router issues IP address and your Asus router gets it on its WAN interface
DHCP3 – your Asus router issues multiple IP addresses and your clients get them (laptop, phone, TV, etc.)
Error “ISP's DHCP did not function properly” which we discuss here is happening on WAN interface of your Asus router which is “DHCP2 Client” on this diagram and I put it into red circle.
For some reason Asus router cannot renew the IP address in its WAN interface (though other devices on this segment in my case can do it) which means that DHCP2 Client is not functioning properly.
If that is so, let us not use this faulty client and instead assign static IP address here which I did.
So, you login to your Asus router, go to WAN tab and choose “WAN Connection Type” = “Static IP”.
Upon completion you will get new section “WAN IP Setting”. Provide IP Address, Subnet Mask and Default Gateway settings here. Once done, exclude this IP address from the distribution range of DHCP2 Server (you need access to ISP’s router for this).
Hope, my experience will be of some help to others.
View attachment 26242
The documentation is wrong. It's 12 requests per minute, one every 5 seconds. This means it's 0.2Hz.Btw, Asus doc says continuous mode (which I haven't set yet) queries at 12hz, so realize you're sending 12 requests per second if you switch to that.
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