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Date:	Mon, 9 Aug 2010 23:04:26 -0400
From:	Jon Smirl <>
To:	Netdev <>
Subject: Auto generation of IPv6 link local address

When I bring my Ethernet interface up it automatically gets a link
local IPv6 address.

eth3      Link encap:Ethernet  HWaddr 00:1b:21:59:65:32
          inet addr:  Bcast:  Mask:
          inet6 addr: fe80::21b:21ff:fe59:6532/64 Scope:Link  -->
Missing from my driver
          RX packets:1836635 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1283010 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:2259859914 (2.2 GB)  TX bytes:121836850 (121.8 MB)
          Interrupt:16 Memory:dbd60000-dbd80000

I'm writing a device driver for new 802.15.4 hardware. When I bring it
up I don't get an automatic IPv6 link local address. What controls
whether an adapter gets a link local address added or not? My driver
should get one so I must have something wrong in my code.

wpan0     Link encap:IEEE 802.15.4  HWaddr 00:50:c2:ff:fe:a8:a8:c5
          UP BROADCAST RUNNING NOARP  MTU:1280  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:10
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

Jon Smirl
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