[FS#604] no recognition for plug out ethernet cable on WAN Port

[LEDE Bugs]

The following task has a new comment added:

FS#604 - no recognition for plug out ethernet cable on WAN Port 
User who did this - c. storch (storchi)

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ok. but how is plugin of the cable detected?
cs
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=604#comment2094