netdev - cannot assign IPv6 address to dummy interface

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Message-ID: <20110925101300.GA3316@torres.zugschlus.de>
Date:	Sun, 25 Sep 2011 12:13:00 +0200
From:	Marc Haber <mh+netdev@...schlus.de>
To:	netdev@...r.kernel.org
Subject: cannot assign IPv6 address to dummy interface

Hi,

this is a locally compiled vanilla 3.0.4 kernel on Debian sid.

$ uname -a
Linux swivel 3.0.4-zgws1 #2 SMP PREEMPT Sat Sep 24 12:34:50 UTC 2011 x86_64 GNU/Linux
$ ip addr show dev dummy0
7: dummy0: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue master br0 state UNKNOWN
    link/ether 06:b8:41:e5:aa:aa brd ff:ff:ff:ff:ff:ff
$ sudo ip addr add dev dummy0 192.168.18.254/24 brd +
$ sudo ip addr add dev dummy0 2a01:238:4071:321f::100/64
RTNETLINK answers: Permission denied
$ sudo ip addr add dev eth0 2a01:238:4071:321f::100/64
$ ip addr show dev eth0
2: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN qlen 1000
    link/ether f0:de:f1:79:90:1c brd ff:ff:ff:ff:ff:ff
    inet6 2a01:238:4071:321f::100/64 scope global tentative
       valid_lft forever preferred_lft forever
$ ip addr show dev dummy0
7: dummy0: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue master br0 state UNKNOWN
    link/ether 06:b8:41:e5:aa:aa brd ff:ff:ff:ff:ff:ff
    inet 192.168.18.254/24 brd 192.168.18.255 scope global dummy0
$

Why is root not allowed to assign an IPv6 address to a dummy interface?

Greetings
Marc

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