[FS#612] WAN to LAN leakage on MT7620 devices

[LEDE Bugs]

The following task has a new comment added:

FS#612 - WAN to LAN leakage on MT7620 devices
User who did this - Jo-Philipp Wich (jow-)

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Please share your patch here so that a proper solution can be implemented.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=612#comment2731