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

On Wed, 20 Dec 2017 09:37:29 +0200
Serhey Popovych [off-list ref] 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 <redacted>

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.