Simple DNS question about some basics. NOTIFY and REFRESH difference

[Kevin Darcy]

I think BIND just uses the "reasonable defaults". I'm not aware of any
configurability in this regard.


- Kevin

Lists User wrote:

> In teh RFC 1996 it states:
>
>       The interval between transmissions, and the total number of
>       retransmissions, should be operational parameters specifiable by
>       the name server administrator, perhaps on a per-zone basis.
>       Reasonable defaults are a 60 second interval (or timeout if
>       using TCP), and a maximum of 5 retransmissions (for UDP).  It is
>       considered reasonable to use additive or exponential backoff for
>       the retry interval.
>
> Where is this parameter set?  Or is this not implemented yet?
>
> Thanks,
> -Steve
>
> On Wed, 21 Feb 2001, Kevin Darcy wrote:
>
> >
> > According to RFC 1996, all *registered* slaves are sent the NOTIFY.
> > *Stealth* slaves, however, i.e. ones not listed in the NS records for the
> > zone, do not get NOTIFYs by default, but you can use also-notify for them.
> > If a slave does not receive a NOTIFY, either because it was never sent, or
> > because the NOTIFY failed (probably due to some network problem), then it
> > will wait some period of time up to REFRESH since the last serial-number
> > check, before checking the zone, noticing that it has changed, and
> > replicating.
> >
> > The bottom line is that if you want reasonably-fast propagation for a
> > stealth slave, make sure you have an also-notify for it.
> >
> >
> > - Kevin
> >
> > Lists User wrote:
> >
> > > When a master DNS is updated does it automatically NOTIFY the slave
> > > DNS?  Or must the slave dns go get a refresh when the SOA Refresh
> > > parameter has expired.
> >
> > > If the Master does notify the Secondary (not waiting for the Slave record
> > > to expire) then does it do so by default?  I know you can specify
> > > additional nameservers you can have the master to notify, but by default
> > > it does all the ones listed as NS records.  Correct?
> > >
> > > Let me know how off I am here.
> > >
> > > Thanks,
> > > -Steve
> >
> >
> >
> >