Hi @SkillsFactory 

Thanks for posting in our business forum.

Have you checked the router DNS?

You can resolve it, it could be your DNS cache on the computer. This is not the same thing for the router.

Make sure your DNS is proper and fill a proper DNS domain or IP in the blank.

You should try IP if the domain does not work. It should tell why it does not work. If IP works, that's your DNS resolution.

Hi @SkillsFactory 

Thanks for posting in our business forum.

SkillsFactory wrote

  @Clive_A 

Hi, DNS are ok, the request also expires with the IP addresses but I can Ping correctly the same addresses with the router console

This log timestamp is after/behind the time you set the NTP as an IP address?

Hi @SkillsFactory 

Thanks for posting in our business forum.

SkillsFactory wrote

  @Clive_A In case it happens to someone else: it was a PPPoE configuration issue. The provider didn’t specify which 802.1q QoS to set, so I left it on default. It connected but caused routing problems, connection quality issues, and even FTP access troubles...
Setting it to 1 makes everything work perfectly.

Good to know.

Yeah, it is typical that your ISP does not specify the QoS priority. They don't maintain that for you as you are not using the business line or they have not set up QoS on their end. QoS would not be effective as long as it goes out from the WAN interface. ISP server would think, the frames are all the same.

VLAN setting on the WAN is supposed to match what the ISP provides. They decide what VLAN you use. You set it to the correct value. That's it. Nothing you can improvise on this.