New GL-MT6000 and SB8200

[Netnewb]

Hi all, apologies for my naivety, very little network experience and new to OpenWrt.
Setting up a new network with OpenWrt on a new GL-MT6000 connected to a new Arris SB8200.
I've set up OpenWrt on the MT6000 and successfully connected. Also successfuly connected to the SB8200 with a network cable and have good Internet connection.
When I connect the MT6000 WAN port to the SB8200 OpenWrt does not see the internet. Also tested by connecting the MT6000 WAN port to another wireless router which is working correctly on another internet network, but the MT6000 still doesn't have internet connectivity.
I would appreciate any troubleshooting advice!

[psherman]

The problem is very likely your cable modem. Specifically, it has 'learned' the MAC address of your previous router/firmware. That may be different now. The solution is simple:

1. Unplug power from both the cable modem and the router.
2. unplug the ethernet cable between the two devices.
3. plug in the power to the cable modem.
4. let it fully boot up and lock onto the cable signal (all the usual LEDs should be on except for the ethernet LED).
5. unplug the cable modem for 10-30 seconds and repeat from step 3 until you have power-cycled the modem 3 times.
6. plug in the power to the router and wait for it to complete the boot process.
7. plug in the ethernet cable between the cable modem and the router's wan port.

[Netnewb]

Thanks for the quick response psherman!
I followed your steps, actually power cycled the modem 4 times, 30 seconds off between. After powering up and connecting the MT6000, still same status, no internet connectivity. Network>Diagnostics>IPv4 Ping shows "ping: bad address 'openwrt.org' "
I'm assuming once the devices connect successfully the "wan" under Network>Interfaces should be green?

[psherman]

The color of the interface doesn’t change based on the connection.

ifstatus wan | grep address
logread-e udhcpc

[Netnewb]

Thanks psherman, looks like there is no wan address? Here's the SSH output:

root@OpenWrt:~# ifstatus wan
{
"up": false,
"pending": true,
"available": true,
"autostart": true,
"dynamic": false,
"proto": "dhcp",
"device": "eth0",
"data": {

    }

}
root@OpenWrt:~# logread -e udhcpc
Tue Dec 24 19:43:35 2024 daemon.notice netifd: wan (2183): udhcpc: started, v1.36.1
Tue Dec 24 19:43:35 2024 daemon.notice netifd: wan (2183): udhcpc: broadcasting discover
Tue Dec 24 19:43:38 2024 daemon.notice netifd: wan (2183): udhcpc: broadcasting discover
Tue Dec 24 19:43:41 2024 daemon.notice netifd: wan (2183): udhcpc: broadcasting discover
root@OpenWrt:~# client_loop: send disconnect: Connection reset

[psherman]

Try the process again, but this time leave your cable modem unpowered for 30 minutes.

[Netnewb]

OK, I've power cycled the modem many times yesterday, leaving it unpowered for well over 30 minutes each time. Powered it on last night and left it connected to only the coax/cable connection. This morning powered on the MT6000 and connected network cable. Unfortunately they're not connected and logread still shows events from the 24th?
root@OpenWrt:~# logread -e udhcpc
Tue Dec 24 19:43:35 2024 daemon.notice netifd: wan (2188): udhcpc: started, v1.36.1
Tue Dec 24 19:43:35 2024 daemon.notice netifd: wan (2188): udhcpc: broadcasting discover
Tue Dec 24 19:43:38 2024 daemon.notice netifd: wan (2188): udhcpc: broadcasting discover
Tue Dec 24 19:43:41 2024 daemon.notice netifd: wan (2188): udhcpc: broadcasting discover

Do I need to flash OpenWrt again or take some other action? Maybe flash the GL.iNet firmware back on the router?

I appreciate your help here, or anyone who can provide input. Thank you

[lleachii]

Is there a reason your WAN and WAN6 are different interfaces?

Have you edited the network config from the default in any way?

[Netnewb]

When the devices did not initially connect, I attempted to "Edit" the settings, changed protocol to static, bridged. Honestly not really knowing what I was doing, but when the changes did not fix the connection, I tried to revert the changes back to what they were from my initial OpenWrt default after flashing.

Do you have recommendation on what they should be set to? Or is there a way to reset them back to default values?

[lleachii]

@Netnewb

Or is there a way to reset them back to default values?

Browse to System > Backup / Flash Firmware and then click "Perform reset".

[Netnewb]

That did it, thank you lleachii!

I did it to myself messing around with those interfaces when the connection did not initially work. If I would have left it default and performed the resets that @psherman it would have worked.

Thank you both for your help walking me through this. Happy holidays to you all!

[psherman]

Great catch @lleachii ! I missed that entirely.

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Thanks!