John Beck wrote:

> * all interfaces are plumbed

On issue with that.

> * all wired interfaces are brought up (per above)

That also seems fine for a default.

What about IPMP and standby interfaces ?

> * all wireless interfaces are off (i.e., left plumbed, but not brought up)

For wireless devices they could be on if the radio is on, otherwise they 
are off (well they have to be). Though I think what you said below might 
be better to avoid split personality mode.

> * in the event that no wired interface can be brought up (either because
>   no cable is plugged in, or nothing is live at the other end), then one
>   wireless interface can be brought up, using some TBD preference if there
>   is more than one such interface available


I think system with multiple wireless interfaces are probably rare.  For 
those that do have multiple why not just bring them all online, just as 
you do for wired links.  The interesting case for multiple wireless 
interfaces maybe that the reason the user has more than one is because 
the hardware supports different wireless systems (eg NIC1 does 'a' and 
NIC2 does 'b/g').

For wireless you also need to be concerned with which network you attach
to - today wificonfig profiles give that but in the future NWAM needs to
provide that.

By wireless are we just talking about WiFi or are things like GPRS or 3G 
  considered in here too ?

What about IP over bluetooth (yeah I know we don't have a bluetooth 
stack yet but we might get one - no we NEED one).

>       For security reasons, bridging networks must be not permitted by
>       default.

At first I read this as bridge as in ethernet bridge.  I then realised 
that you mean being mulit homed between to different classifications of 
network (eg SWAN and Internet).

For that reason I think I agree that if there is a wired link go with 
that and only bring up wireless links if there are no wired ones.

For systems that actually need both wired and wireless active then the 
admin needs to be able to configure that policy.

-- 
Darren J Moffat

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