PPPoE Server for Router in LAN

RouterOS Beginner Basics
1

My main internet service was recently changed to fiber and my new router is a MikroTik hEX S with a SFP fiber module. Works fine so far. In the LAN are two more Routers, that shall provide the subnets for two appartments. One of these routers is a Telekom Speedport W724v. Its VoIP telephones can only get activated, when WAN connetion is established and WAN setting only works with user/password creditentials. So I set up a PPPoE server (on ether3) in the MikroTik and it connects, however I do not get internet access from the net behind the Speedport (It worked for short time when I switched on Torch). What kind of NAT and Firewall setting are necessary in the MikroTik to pass through all Network traffic comming from the Speedport?

Internet → MikroTik → Speedport → Laptop/Mobile etc.

I am new to RouterOS, if you need data/logs please tell me how to get them. Thank you.

2

In the short term, it may be enough to add the LAN Interface list to the PPPoE profile being used.
Though this will allow clients behind pppoe to connect to all your other LAN devices.

3

Thank you for your advice. Today I found time to work on my problem again. But unfortunately I had to start all over with my config and somehow I’ve now miss another step. The remote router does not connect to the provided PPPoE server anymore.
Hardware setting is still the same: (internet) – MikroTik – Speedport …
The IP if my MicroTik hEX is 192.168.88.1, the SpeedPort behind it on ether3 has the fixed IP 192.168.2.1

Here is what I did as configuration now, I tried to note every step in terminal code:

/ip pool add name=my-ippool ranges=192.168.88.200-192.168.88.255
/ppp profile add name=my-profile local-address=192.168.88.1 remote-address=my-ippool dns-server=9.9.9.9 only-one=yes
/ppp secret add name=myuser password=mypswd service=pppoe profile=my-profile
/interface pppoe-server server add service-name=my-server interface=ether3 one-session-per-host=yes disabled=no max-mtu=1492 max-mru=1492
/ip firewall nat add chain=srcnat out-interface=ether1 action=masquerade

I have also checked that my ether3 is not part of any (LAN-) bridge any more

/interface bridge port print where interface=ether3

gives an empty return = should not be in a bridge.

Any idea whats wrong?

4

If you have a bridge that already uses the 192.168.88.0/24 subnet, don't assign the same subnet to the pool and PPP profile used by the PPPoE server, choose another address range if possible.

Here you've forgotten to set default-profile to my-profile, it's probably the root of your issues.

Also RouterOS supports RFC 4638 for the PPPoE server too. You can set max-mru=1500 max-mtu=1500 on the server instance.