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Marvell A38x SDK Buildroot-2015.11 which comes with Busybox-1.24.1. I need to add VLAN interface and get SLAAC address from this interface. I could add VLAN interface with the following commands

vconfig add eth1 3004   - vconfig is from busybox
ifconfig eth1.3004  up 
ifconfig -a      - see the outpout of eth1.3004

Two Questions:

  1. How can I generate this VLAN interface eth1.3004 automatically on boot-up ? any advice to modify /etc/network/interfaces or if-pre-up.d using ifup/ifdown?

  2. Option makes eth1.2004 aquires IPv6 SLAAC ? My SOC board vendor says the slaac router advertisement is working. When I run the command: ifconfig eth1.3004 up, but still only see link-local IPv6. Any advice to debug this issue ?

eth1.3004 Link encap:Ethernet  HWaddr 00:50:43:66:35:37
          inet6 addr: fe80::250:43ff:fe66:3537/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:468 (468.0 B)

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