[FS#382] Simple static routes not working when firewall+masquerading is active

[LEDE Bugs]

The following task has a new comment added:

FS#382 - Simple static routes not working when firewall+masquerading is active
User who did this - Jo-Philipp Wich (jow-)

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Please provide the network and firewall config of router B.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=382#comment1206