[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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LEDE has a stricter firewall rule layout compared to OpenWrt CC which will likely drop unrelated return traffic by default.

Unrelated return traffic might occur after ICMP redirects.

If this is the case you should add firewall accept rules for both directions and not rely on established/related processing to catch return packets.

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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#comment1239