[radvd-devel-l] RFC: interfaces going up/down during radvd lifetime

[Nathan Lutchansky]

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On Wed, 15 Mar 2006, Pekka Savola wrote:
> > Now, one could argue it'd be nice if this "worked by default", so that, for 
> > example:
> > a) if interface goes missing and comes back, automatically restart
> >    advertisements
> > b) if interface didn't exist when starting up, but IgnoreIfMissing is
> >    defined, automatically start advertising when the interface starts
> >    working.
> > c) don't print a lot of error messages on missing/non-working
> >    interfaces if IgnoreIfMissing is defined

This sounds like the most natural way for radvd to work.  We shouldn't 
need to send HUP to radvd if it can determine automatically when 
interfaces appear and disappear.

> > I'd like to note that doing the processing checks could take a bit of CPU 
> > time, especially if you advertise (say) 20 times a second.

If you set radvd to advertise 20 times a second you're already expecting 
it to take a bit of overhead.  If you'd rather not check for interface 
changes that often, though, you can put another time compare in the timer 
routine to run the interface checks no more than once a second, say.  
- -Nathan
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