[FS#362] WR1043ND v4 Slow WAN -> LAN Whilst Synced @100Mbps

[LEDE Bugs]

The following task has a new comment added:

FS#362 - WR1043ND v4 Slow WAN -> LAN Whilst Synced @100Mbps
User who did this - SpiderVice (Spider-Vice)

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I didn't run iperf but I did test the link copying between two computers connected by the LAN (via Windows' file sharing) and I get the correct 100 Mbps speed (as the cable I use for this device can only do 100 Mbps). As I said, I tested this, and it only happens in connections that originate in the WAN:

i.e.
Downloading from the Internet with a 100 Mbps cable: Strange behaviour
Downloading from the Internet with a Gigabit cable: OK, full 95 Mbps Internet speed.
Copying files to the LAN with a 100 Mbps cable: OK
Copying files to the LAN with a Gigabit cable: OK

Stock firmware does all those OK.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=362#comment2017