Interface start-up ordering sequence, multiple passes?

[Bill Nottingham]

Pekka Savola (pekkas at netcore.fi) said: 
> When designing an IPv6 extension to initscripts, we came across this one 
> particularly knotty problem.
> 
> There seem to be no way to select the order in which the interfaces would 
> be brought up by e.g. "network start", except by naming hacks.  (There are 
> also this, nowadays smaller, problem of on-demand dial-up interfaces..)

Correct, the only constraints made on ordering are by device type.
Otherwise it ends up being alphabetical.

> There seems to be no facility to run a script "in the second pass" i.e., 
> after all the interfaces have been brought up.
> 
> Both of these facilities would seem to be useful, espcially being able to 
> say "run these commands after interface X has been brought up".

There's /sbin/ifup-local.

Bill