[FS#394] PPPoE/802.1Q issues on Linksys WRT1900ACS

[LEDE Bugs]

The following task has a new comment added:

FS#394 - PPPoE/802.1Q issues on Linksys WRT1900ACS
User who did this - Jo-Philipp Wich (jow-)

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Please try the following settings:

 - Leave wan ifname at eth0
 - Change "option vlan 2" to "option vlan 201"
 - Change "option ports '4 5' to "option ports '4t 5'"

Note that a recent change in LEDE (https://git.lede-project.org/9641cee) swapped eth0 and eth1 on the ACS so if you try newer builds you might reset your network config.

The basic idea remains the same though; make the external wan switch port tagged and change the untagged wan vlan 2 to an externally tagged vlan 201.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=394#comment1290