MT2500 Bridge Mode with PPoE

Our ISP gives us internet via PPOE unfortunately our routers do not support this on the WAN side. Can I set the MT2500 to bride mode and still be able to configure PPoE on the WAN side?

Why not just using PPPoE directly on the MT2500?
See Ethernet - GL.iNet Router Docs 4

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This is what I want. WAN side with PPoE and bridging to LAN. I was told it cannot be done as turning on bridge mode will disable PPoE on the WAN side.

What should be the result? Which device will get the external IP then and why?

This is what I am planning:
MT2500-WAN interface connected to ISP - PPoE
MT2500-LAN bridge mode connect to a switch
Router1 WAN connect to the switch - External IP 1
Router2 WAN connect to the switch - External IP 2

The ISP is giving me 4 usable IPs, I dont think the MT2500 will need to consume one of them if its set to bridge mode right?

This won't work with the MT2500, I assume.

Afaik it does not support multiple IPs out of the box and there is no real passthrough mode.

Not support by default.
And bridge mode shall not support PPPoE.

I think you may need a feature something like Multi-Nets NAT, which is not supporterd on MT2500.
It could create multi local networks and correspond to severl public IP address from your provider.

I was told I just need to turn off NAT in routed mode and it should work. This is not possible with this router right?

It's possible, it's a half bridge mode:
https://openwrt.org/docs/guide-user/network/wan/bridge-mode

Most common in ISP-provided consumer devices is half bridge mode (cheerfully called “bridge mode” by many manufacturers). In this mode, the device handles authentication (the login/password of your Internet contract) and encapsulation, and it will duplicate the WAN IP address from the ISP to the downstream device. More often than not this makes it inaccessible on the local network so the only way to get it back to normal operation is to reset it. Some devices offer a secondary “management” IP for this mode that can be used to reach their web interface, check the manual.

Here's an example from the Netgear DM200, you are going to have to edit the network file to bridge the PPPoE connection to the LAN port to pass the WAN ip through

Thanks. Would this allow me to pass through /29 subnet? If so how would i wedding the IP on LAN?

Is that a routed subnet?

Not routed i dont think i as can use any ip address. I was given /29 via one lan port and ppoe

Okay, so that's 8 IP addresses, 5 usable, PPPoE device for routing for the other 5 will use up network, broadcast and gateway addresses because of how nonat works, running nat would allow you to use all 8, you'd poke holes through the firewall for each device per IP address.

Reference material:
https://www.oneeyedman.net/posts/2020090401-turris.html
https://forum.archive.openwrt.org/viewtopic.php?id=56182

To be honest, the GL-iNet graphical interface is going to struggle to do what you require.
Luci can do all this, and you're going to be modifying network and firewall files.
You can either stay on GL firmware and we'll try our best with the configuration or look at flashing actual Openwrt and asking the Openwrt forum for full guidance.

If it had been a routed subnet, you'd have been able to vlan the /29 range to bypass the firewall on a vlan interface behind the Brume 2.

A few of us tried today and cannot figure how to get it working. Might end up buying another line but it will also be delivered with pppoe.

There is no way to have pppoe on the wan and single pass through using bridge to lan? Even we dismiss the idea now of using ip address. We just want to use one ip address now and pass this through to a single router.

It's possible but it's going to depend on your command line Openwrt technical ability, it's not something you can do in the GL user interface, and the GL scripts are going to interfere with what you program.

haven't used cli in openwrt before but I am ok with cisco ios and other routers. Can you give me some examples?