netdev - Re: Cannot set IPv6 address

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Date:   Wed, 16 Nov 2016 16:34:42 +0100
From:   David Lebrun <david.lebrun@...ouvain.be>
To:     Saeed Mahameed <saeedm@....mellanox.co.il>
CC:     Linux Netdev List <netdev@...r.kernel.org>,
        Doron Tsur <doront@...lanox.com>,
        Majd Dibbiny <majd@...lanox.com>
Subject: Re: Cannot set IPv6 address

On 11/16/2016 04:22 PM, Saeed Mahameed wrote:
> Hi David,
> 
> The following commit introduced a new issue when setting IPv6 address
> via the following command:
> 
> /sbin/ip -6 addr add 2001:0db8:0:f112::1/64 dev enp2s2
> RTNETLINK answers: Operation not supported
> 
> Offending commit:
> 
> commit 6c8702c60b88651072460f3f4026c7dfe2521d12

Saeed,

Do you have LWTUNNEL enabled ? This commit introduced a bug causing IPv6
initialization to fail if LWTUNNEL is disabled. The patch has been
submitted to the list and is pending approval from DaveM.

If you see something like

NET: Registered protocol family 10
IPv6: Attempt to unregister permanent protocol 6
IPv6: Attempt to unregister permanent protocol 136
IPv6: Attempt to unregister permanent protocol 17
NET: Unregistered protocol family 10

in you dmesg logs then it would confirm my theory.

Short fix: enable CONFIG_LWTUNNEL or apply patch in attachment

David

View attachment "0001-ipv6-sr-add-option-to-control-lwtunnel-support.patch" of type "text/x-patch" (4510 bytes)

Download attachment "signature.asc" of type "application/pgp-signature" (164 bytes)