> Well, since the interface was last created, for interfaces that can be
> created and destroyed on the fly (think pcmcia, or cloning interfaces).
> 
> > plus error rates.
> 
> It might be worth doing.  For my own netlink, I long ago started
> logging byte and packet counts every five minutes (and added an option
> to netstat suited to doing so), and when I get curious I massage the
> resulting data and see what interesting facts I can pull out of it....

I've found 'rrdtool' a very good companion for doing that ..  It's usually
fairly easy to spot "possible problems" if you have a few graphs to look at.

And it looks pretty :-)

Greetings
   Anders