netdev - Re: Unable to create ip alias on bridge interface

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Message-ID: <20180528120540.64qrr3pcylboliew@unicorn.suse.cz>
Date:   Mon, 28 May 2018 14:05:40 +0200
From:   Michal Kubecek <mkubecek@...e.cz>
To:     Akshat Kakkar <akshat.1984@...il.com>
Cc:     netdev <netdev@...r.kernel.org>
Subject: Re: Unable to create ip alias on bridge interface

On Mon, May 28, 2018 at 02:35:41PM +0530, Akshat Kakkar wrote:
> I am having a bridge named br0 having ports eno1 and eno2 as members.
> I have given IP to br0 as 10.10.10.1/24
> 
> Now I want to create alias on br0 as br0:1 and give IP as
> 10.10.10.2/24, but I am unable to.
> 
> I know, we can add multiple IPs to br0 using "ip addr" command, but I
> dont want to do it that way as I want all outgoing connections from
> br0 to take src ip as 10.10.10.1. I know by providing option of "src"
> in all routes, things can work but this looks more like a hack and
> less of a solution.

I don't understand. There are no actual aliases since kernel 2.2 and an
attempt to add "br0:1 with address 10.10.10.2/24" using ifconfig should
result in the same configuration as

  ip addr add 10.10.10.2/24 brd + label br0:1 dev br0

where the "label br0:1" part only adds a label which allows ifconfig to
see the new address.

As both addresses share the same range, you don't even have to worry
about source address as primary address (10.10.10.1 - or first one added
in general) will be used unless specified otherwise.

Michal Kubecek