Solved RT-AX86U Pro log repeats "WAN_Connection: WAN was restored" while red light keeps on and no Internet connection?

[bennor]

Since the system log reports it (see below): What is the content of "/jffs/configs/dnsmasq.conf.add" ?

• When I nano the content, it's empty?
• What should be added there?

By default AFAIK its usually empty (eta: if it exists at all). If you use YazDHCP, you may see the following entries in the dnsmasq.conf.add file.
https://github.com/jackyaz/YazDHCP?tab=readme-ov-file#changes-made-to-dnsmasq-configuration

addn-hosts=/jffs/addons/YazDHCP.d/.hostnames # YazDHCP_hostnames
dhcp-hostsfile=/jffs/addons/YazDHCP.d/.staticlist # YazDHCP_staticlist
dhcp-optsfile=/jffs/addons/YazDHCP.d/.optionslist # YazDHCP_optionslist

 

[ColinTaylor]

By default, this file is empty, isn't it?

By default the file doesn't exist. Trying to edit a non-existent file will open a new empty file. Or, having installed and then removed some third-party addons may leave behind an existent but empty file.

 

[KevTech]

@Rici - As a test what happens if you use the default Comcast DNS servers?

 

[Lynx]

I really think that you should rule out that the issue isn't the same one addressed by:

GitHub - lynxthecat/maintain-wan-lease: Resolve problem with Asus Merlin routers in terms of release/renew of udhcpc.

Resolve problem with Asus Merlin routers in terms of release/renew of udhcpc. - lynxthecat/maintain-wan-lease

github.com

The situation for which I wrote the script seems very similar - at exactly every 48 hours my modem would drop the ethernet link momentarily to trigger a downstream refresh, but the Asus router wouldn't pick up on this, resulting in loss of internet connectivity. The script monitors for this signal and effects the necessary refresh.

 

[Rici]

Update: As it seems switching the cable modem fixed my issues.

Since then my Asus router no longer lost the WAN connection.