GL-B3000 (Marble) and Samsung TV

a13ssandr0 · 2025-01-20T11:07:16.647Z

Hi,
I recently bought a GL-B3000 Marble (from now on called "AP") to extend the coverage of the wifi signal in my house, after setting it up in Access Point mode, I connected my Samsung smart TV to one of the LAN ports, TV detects the cable is plugged but says it is not able to connect to the internet (both with and without DHCP enabled), with the exact same settings and cable my laptop is able to connect to the internet flawlessly.
If I connect the TV via wifi to the AP the problem disappears, of course it also disappears if I remove the AP and use its cable to connect the TV directly to the main router (GL-MT6000) on the other side of the house.
Other tests done (without success):

Upgrading the firmware to 4.7.0 (beta)
Plugging the cable that goes to the main router in one of the LAN ports instead of the WAN port
Moving the WAN port manually from WAN firewall zone to LAN firewall zone
Totally disabling the VLAN on LAN ports (I don't have any vlan at home, but the AP places lan ports on untagged VLAN 1); disabling VLAN functionality at all made the AP unaccessible and had to factory reset it

Thanks in advance for your support.

admon · 2025-01-20T11:25:12.040Z

If you only want to extend the coverage of the Wi-Fi, go with Extender mode instead of Access Point mode.

Router: Operate as a standard router, managing traffic between your local network and the internet, and providing features like NAT, firewall, and DHCP.
Access Point: Function as an access point, extending your existing wired network by providing wireless connectivity without routing traffic.
Extender: Work as a range extender, boosting the signal of your existing wireless network to cover a larger area and eliminate dead zones.
WDS (Wireless Distribution System): Similar to Extender, please choose WDS if your main router supports WDS mode.

a13ssandr0 · 2025-01-20T12:51:55.056Z

Yes, I'm aware of the Extender mode, but the GL-MT6000 and the GL-B3000 are too far away, also I already have an ethernet cable running inside the walls (maybe I didn't make this clear, my bad), so I prefer to have the uplink via the cable rather than wifi.

hecatae · 2025-01-20T14:35:38.612Z

Sounds like AP mode is broken.
Which port is the Wired connection to the MT6000 plugged in to?

a13ssandr0 · 2025-01-21T13:09:48.694Z

I tried plugging the MT6000 both in the WAN port and in one of the LAN ports.
No matter the port, the WiFi always works correctly, but TV is not able to connect via Ethernet

groentjuh · 2025-01-21T13:26:14.121Z

Just wondering: Does your Samsung TV obtain on IP then fail to get internet? Or also not get an IP?

My Samsung TV also magically has connectivity issues from time to time. Often a simple: Remove power plug from TV does sometimes do wonders in case it gets an ip from DHCP, but no further internet.

a13ssandr0 · 2025-01-21T13:48:56.334Z

I tried both with and without DHCP.
With DHCP it fails to get the address, without DHCP with static address, netmask, gateway and dns set up says it can reach the gateway but not the internet.
I also tried a full reboot of the tv (holding the power button for 10 seconds).

a13ssandr0 · 2025-03-02T15:45:36.043Z

Hi Everyone, just got some interesting news, seems like it's a problem with link speed negotiation.
I made three tests:

Reference: connected the TV directly to the Marble (openwrt detects the cable is connected and running at 100Mbps, but still nothing);
Switch: connected the TV to a dumb Gigabit switch (tp-link TL-SG105) and the switch to the Marble, TV manages to get an IP address and connects to the Internet successfully;
PC: tried again with my laptop running Kubuntu 24.10: when connecting with all options set to automatic (DHCP and Automatic link speed negotiation) everything works, if I set link negotiation to Manual and then select 100Mbps Full duplex (like the TV negotiates) the computer is no more able to even get an IP address via DHCP.

Digging further with Wireshark (using the settings above) I discovered that the Marble is forwarding me the broadcast traffic coming from my network, but traffic coming from my computer is ignored: Wireshark shows a couple of DHCP requests coming from my computer but no response.