slave to slave zone transfers HOWTO?

Kevin Darcy kcd at
Fri Oct 11 21:17:19 UTC 2002

Joseph S D Yao wrote:

> On Fri, Oct 11, 2002 at 01:20:58PM -0600, Cricket Liu wrote:
> ....
> > Slaves send NOTIFYs to all authoritative name servers except the one
> > in the MNAME field by default.  To really tune your NOTIFY setup,
> > you could set the "superslave" to use "notify explicit" and send NOTIFY
> > messages only to the "subslave."  Then you'd set "notify no" on all slaves
> > that weren't themselves masters.
> This suprises me.
> Let's say you have three peer servers, A, B, and C.  Internally, A has
> the "master" role, and appears in the MNAME field of the SOA.
> Cricket changes the zone on A.  A sends out NOTIFYs to B and C.  B and
> C respond by checking serial numbers and then requesting a zone
> transfer from A.
> So now, per what you have said, B and C each send NOTIFYs to each
> other.  What do they do?  Check serial numbers with A a second time?
> Say, instead of 3 servers, you have 30.

This doesn't surprise me at all. We have lots of slaves in our internal DNS and
got hammered when BIND started implementing the RFC properly.

> Yeah, yeah, don't quibble,
> this is a Gnedenken experiment.

Wie, bitte?

- Kevin

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