Re: Detached address check

[Roy Marples <roy%marples.name@localhost>]

On 18/11/2017 13:37, Robert Swindells wrote:
> On Fri, November 17, 2017 4:57 pm, Robert Swindells wrote:
> > I feel that the changes made to check whether a sending address is valid
> > are too strict.
> >
> > The check means that an attempt to connect from the address of an
> > interface that is marked detached to the same address will fail even
> > though there is still a route for this address to the loopback device.
> >
> > The change was introduced in:
> >
> > <http://mail-index.netbsd.org/source-changes/2016/09/15/msg077726.html>
>
> To clarify, I expect to be able to do:
>
> # ifconfig wm0 inet 192.168.0.1 netmask 0xffffff00 up
> # ping 192.168.0.1
>
> and for it to work every time, not just when wm0 has detected a
> carrier. In the traditional usage, the packets don't go through wm0
> anyway they go through lo0.

Aside from ping, what else do you really want?

> The RFC 4862 referenced in the commit is for IPv6, I don't think that
> IPv4 behaviour should change too.
>
> I'm not even convinced that I want this behaviour for IPv6, I would
> prefer that addresses set using ifconfig(8) should stay valid until
> I change them.

What would you actually do with them though?
You have localhost - 127.0.0.1 which works just fine.

Roy