[FS#3448] pppoe not work with vlan

[OpenWrt Bugs]

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User who did this - patrickkent (patrickkent) 

Attached to Project - OpenWrt/LEDE Project
Summary - pppoe not work with vlan
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - Supply the following if possible:
 - Device problem occurs on ath79 tl-wr741nd-v4 with 64MB ram
   
With /etc/config/network like below:
config interface 'wan'
        option ifname 'eth1.1234'
        option proto 'pppoe'
        option username 'user'
        option password 'pass'
After run command "ifup wan", no process pppd will appear, and logread not show anything.

But with /etc/config/network like below, it will works well.
config interface 'wan'
        option ifname 'eth1'
        option proto 'pppoe'
        option username 'user'
        option password 'pass'

I don't know which commit break it exactly. Only know ar71xx 17.01 worked well. Thanks.

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3448

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