PPPoE debugging

Question

I work with a big governamental network that uses sdwan solution. Recently we are having some issues according to PPPoE debugging. Let's pretend that there are 2 links working in PPPoE mode. Then, when we are trying to debug (diag debug application PPP -1) we don't from what PPPoE interface the logs are coming. Is there some way to find out from what interface is that debugging?

kaman · Answer

Hi vegget,

You can use the following debug commands to check the interface information:

diag debug application pppoed 255
diagnose debug enable

Additionally, you can take the Packet capture filter on PPPoE interface. Please refer to the below document:

https://community.fortinet.com/t5/FortiGate/Technical-Tip-Packet-capture-filter-on-PPPoE-interface/ta-p/305681

If the PPPoE interface is correctly configured, it would be required to capture the following information from FortiGate:

diag netlink interface list <pppoe>
diag debug reset
diag debug disable
diag debug app pppoed -1
diag debug enable

https://community.fortinet.com/t5/FortiGate/Troubleshooting-Tip-Troubleshooting-PPPoE-connection-failed/ta-p/225700

Could you please clarify the exact issue you are encountering with PPPoE?

In some cases, if your device is part of an HA setup, a conflict may occur due to the HA virtual MAC address being duplicated across different HA clusters.

https://community.fortinet.com/t5/FortiGate/Technical-Tip-A-conflict-HA-virtual-MAC-address-in-the-different/ta-p/189577

If you have found a solution, please like and accept it to make it easily accessible to others.

Regards,
Aman

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