[bind10-dev] zonemgr / notify out questions

[Jerry]

> > > 17)  zonemgr expired a zone where the serial was not increased. This
may
> > > be same problem as above #15.
> > > 
> > > [b10-zonemgr] Zone (foo., IN) is expired.
> >  
> >  I can't understand this question, when zone expires, will its serial be
> > changed?

> Serial not changed. The question is: why does it output that the zone is 
> expired?  Why does it think it is expired?

When zone refresh timer finds a zone's master servers can't be reached for
"expire" time
(now - last_refresh_time  >=  expire time), the zone will become expired. 
But if zonemgr receives notify-in messages for a expired zone, it will still
try to connect 
to the zone's master servers and do refresh again.