Re: link-state change for virtual interfaces

[Valery Ushakov <uwe%stderr.spb.ru@localhost>]

On Wed, Sep 25, 2024 at 10:32:18 +0900, Rin Okuyama wrote:

> Recently, link-state emulation has been added to shmif(4) and
> vether(4). Unfortunately, different operations are required for
> link-up/down for these interfaces:
> 
> For shmif(4)
> - link-up:   ifconfig shmif%d media auto
> - link-down: ifconfig shmif%d media none
> 
> https://mail-index.netbsd.org/source-changes/2024/08/20/msg152934.html
> https://mail-index.netbsd.org/source-changes/2024/08/20/msg152935.html
> 
> For vether(4)
> - link-up:   ifconfig vether%d link1
> - link-down: ifconfig vether%d -link1
> 
> https://mail-index.netbsd.org/source-changes/2024/09/24/msg153517.html
> https://mail-index.netbsd.org/source-changes/2024/09/24/msg153525.html
> 
> Wouldn't it be better to unify as far as possible? If so,
> which one is more preferable? (The 3rd candidate may be
> to add dedicated flag bit, but it seems too much to me.)

"Pluggin" and "unplugging" the media, like shmif does, seems like an
interesting metaphor.  How is it reflected in ifconfig output?
I.e. what does

  $ ifconfig $shmif

show for "media: ..." in both states?

-uwe