[FS#714] ARP/Broadcast does not reach other clients in the same WLAN

[LEDE Bugs]

The following task has a new comment added:

FS#714 - ARP/Broadcast does not reach other clients in the same WLAN
User who did this - Jake (Jakeler)

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Additional interresting information here:
https://forum.lede-project.org/t/clients-in-same-wlan-cant-reach-each-other/2501/22?u=jake

For everyone the experiences this, please check the hairpin mode, is it 0? 
It is 0 on my device and setting it directly to 1 (temporarily) fixes the problem.

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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=714#comment2919