Dual SOA entries

Barry Margolin barmar at alum.mit.edu
Tue May 10 01:48:44 UTC 2005


In article <d5osau$3k7$1 at sf1.isc.org>,
 Mark Andrews <Mark_Andrews at isc.org> wrote:

> > Hi
> > I am getting the double entry for SOA, I read on some website that it is
> > wrong I am supposed to get only one
> 
> 	Two SOA record are expected in a AXFR response.  The second SOA
> 	is how you detect the end of the zone transfer.

And it allows you to detect if the zone was changed out from under you 
during the zone transfer, if the serial number at the beginning is 
different from the serial number at the end.

-- 
Barry Margolin, barmar at alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***



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