Many providers enforce long PPPoE timeout delays. This can be hours in some cases, and can result in the inability to reconnect after an unclean clear-down on the PPPoE session. Unfortunately, routers such as the UDM drop the PPPoE session without a clean disconnect for just about any configuration change.
This has been tested on UDM-SE devices. If anyone is able to verify on other devices such as USG, UDM-PRO/BASE please do post an issue to update the compatibility list with the result, positive or negative.
The script scrapes the journal for the most recent PPPoE session ID, and remote peer. It then issues a PPPoE PADT packet (Force disconnect) to clear the stale session. The router is then able to re-establish a PPPoE session.
This is designed to be used with the UDM Boot Script.
Drop the contents repo into /mnt/data/ppp. Copy the pppoekill.sh script to /mnt/data/on_boot
Alternatively:
mkdir /mnt/data/ppp
curl -Lo /mnt/data/on_boot.d/pppoekill.sh https://raw.githubusercontent.com/bdavj/udm-pppoe-kill/main/pppoekill.sh
curl -Lo /mnt/data/ppp/pppoekill.py https://raw.githubusercontent.com/bdavj/udm-pppoe-kill/main/pppoekill.py
chmod +x /mnt/data/on_boot.d/pppoekill.sh
The script will run on next boot, or you could start it with
nohup /mnt/data/on_boot.d/pppoekill.sh &
Once installed, change the interface at the top of /mnt/data/on_boot.d/pppoekill.sh to your required WAN interface.
By default, this is set to eth9 (SFP WAN on a UDM-SE).
Pull requests are welcome, or if there is a case in which the tool doesn't work, please do open an issue.