[FS#1184] Gateway bug when using multiple network IPs (VLANs)

[LEDE Bugs]

A Project Manager has denied the request pending for the following task:

FS#1184 - Gateway bug when using multiple network IPs (VLANs)
User who did this - Jo-Philipp Wich (jow-)

Reason for denial:
This will not work this way. You need to implement policy or use explicit config route sections for such a setup.

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1184