Access Point and ethernet ports

[Mathieu]

Good evening

I have set up an AC87U as Access Point, connected by cable (WAN port) to the main router. I configured it using the default AP setup mode offered by the GUI.
The wireless (distinct SSIDs from main) is working fine, and so is one wired client. Now, as I tried to plug in a second client, I experienced connectivity issues: client intermittently losing connection.
Browsing through this fine forum, I read that @ColinTaylor and others have reported that, although in theory the LAN ports of an AP are disabled, in practice they are operational. I can certainly confirm I have one working port.
I appreciate my connectivity issue could be down to many other factors, but would like to ask the following:
If one hoped to keep using the LAN ports of their AP, would it be fine to just use the default AP config, or should they configure the AP as a 'wireless router' and manually adjust its settings? If the latter, what in addition to disabling DHCP should be looked at?

Many thanks, and keep safe.

 

[L&LD]

Have you seen the following link? Using an edited 'router mode' will give you the most control, of course.

https://www.smallnetbuilder.com/bas...onvert-a-wireless-router-into-an-access-point

Before you do, have you tried as many combinations of LAN ports for your two devices that may work as-is since everything else you need is working currently?

 

[Mathieu]

No, I had not.
Thank you for the link (by Mr Higgins himself, back in '08, now we're talking!)
I will also do the exercise you suggest - and refresh my combinatorics-: 4 ports, 2 clients. Hmmm... That was way before Tim's post...
Cheers