WAN DNS setting ignored due to pppd - 386.13 on Asus AC68u

[R3dbvll]

Hi all,

I'm really hoping someone can help.
I have an Asus AC68u router (which I realise is old and now no longer supported), but it is still going strong. Currently I'm running Merlin firmware 386.13 on it.

I have just moved house and moved ISPs. Previously I was with Virgin Media, who provided a DOCSIS service. I was able to set the WAN-side DNS servers I wanted to use for the router with no problem - I set this in the router UI.

The new ISP uses PPPoE. I have a Draytek Vigor167 modem in bridge mode fronting the connection, then the Asus router. Everything works fine except for the WAN DNS settings.

From what I can tell in the logs, pppd is pulling the the ISP provided DNS servers and pushing them to file, which dnsmasq is then picking up. Nothing I do seems to change that.
I've tried adding the config option 'ms-dns' in the Additional PPPD Options field, but it makes no difference.

Are there any other pppd options I can provide, or are there other options available to make sure dnsmasq picks up my desired DNS servers?

(note, if interested - the LAN-side DNS settings work fine, and are provided by DHCP to LAN clients)

I checked through the release notes of new firmware versions, but I didn't see anything that could be related.

Many thanks
Chris.

 

[NoLight]

I ran a RT-AC68U for many years with my PPPoE ISP and never had this issue.

I would recommend upgrading to the final 386.14_2 then doing a factory reset.

Also trying DoT set to strict + DNSSC, as that was my config.

 

[dave14305]

Please show what your WAN DNS settings look like and the syslog snippet that shows the ISP DNS servers being read.

 

[bennor]

Currently I'm running Merlin firmware 386.13 on it.

The firmware 386.13 (7-Apr-2024) is almost a year old. You really should update to the latest 386.14_2 (17-Nov-2024) firmware if for nothing other than the security vulnerability fix(es) it contains, namely the one for the AiCloud vulnerability:

Malware damaging ASUS routers?

This malware damaging Asus routers has to be described in a sticky thread with a warning sign! Update: Asus is releasing patched firmware for multiple models. Check for firmware updates! The changelog for most firmware releases contains the following: 1. Strengthened input validation and data...

www.snbforums.com

Retest and see if your issue persists with the latest firmware.