Subject: Re: [PATCH iproute2 1/3] vxcan,veth: Forbid "type" for peer device

From: Stephen Hemminger <[email-masked]>
Date: Tue, 26 Dec 2017 09:05:35 -0800

On Wed, 20 Dec 2017 09:37:29 +0200
Serhey Popovych <[email-masked]> wrote:

> It is already given for original device we configure this
> peer for.
> 
> Results from following command before/after change applied
> are shown below:
> 
>   $ ip link add dev veth1a type veth peer name veth1b \
>                            type veth peer name veth1c
> 
> Before:
> -------
> 
> <no output, no netdevs created>
> 
> After:
> ------
> 
> Error: argument "type" is wrong: not supported for peer
> 
> Signed-off-by: Serhey Popovych <[email-masked]>

This makes a lot of sense.
Maybe the better error message would be to use duparg() since
that is the most likely cause of the user error.