[FS#1169] TP-Link Archer C7 no Wan on intial bootup

[LEDE Bugs]

A new Flyspray task has been opened.  Details are below. 

User who did this - Daniel Tuck (zapfret) 

Attached to Project - LEDE Project
Summary - TP-Link Archer C7 no Wan on intial bootup
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - On initial bootup my Tp-Link Archer C7 v2 will not get a WAN address using the LEDE firmware.  Although the cable is connected and there is a link light the WAN interfaces for v4 and v6 simply say "notconnected".  A manual disable/enable does not resolve the problem the only fix is a physical disconnect and reconnect of the ethernet cable to the WAN interface on the router.

Some other information.
This happens with my Comcast ISP via a cable modem pulling a dhcp and a IPv6-PD address.  (Neither comes up)
The connection is a gigabit ethernet connection via a known good cable (tested via a Fluke cable tester).
I have tried multiple modems (Netgear, and 2 Motorola modems)

This happen with any version of LEDE I have tried.

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1169