[FS#769] Firewall stops traffic / DHCP to WAN interface.

[LEDE Bugs]

The following task has a new comment added:

FS#769 - Firewall stops traffic / DHCP to WAN interface.
User who did this - Tobias Richter (zjttoefs)

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I'm having the same problem: My ISP provides an IPv4 address via DHCP on the WAN interface and OpenWRT/LEDE cannot retrieve that and ends up with a 169... address. Static configuration also fails. Not sure whether fiddling with the firewall helps.

It may be a very popular model, but I am in fact running the same WRT1900ACS v2 as Lars above. Same hardware works fine with DDWRT, but obviously I would prefer to run OpenWRT again.

I would appreciate any ideas how to diagnose the problem.
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=769#comment4521