[FS#227] PPPoE is broken on WRT1900ACS

[LEDE Bugs]

The following task has a new comment added:

FS#227 - PPPoE is broken on WRT1900ACS
User who did this - Mathias Kresin (mkresin)

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Would you please attach/paste your /e/c/network! Do you have to vlan tag your PPPoE traffic? Which ISP?

Are you able to compile your own image? It would be helpful if you can do a git bisect to find the commit which broke PPPoE on your WRT1900ACS.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=227#comment636