bind 8 IXFR

[Mark Andrews]

> That depends on your scenario.  If you manually change the zone file and rest
> art or reload the server, an AXFR will occur.  If some program dynamically up
> dates the SOA, then the IXFR will be "empty" (just have the 4 necessary SOA R
> Rs with no deletes or additions.)
> 
> Blaine

	Actually there is both a delete and a addition.  

	<FINAL SOA>
	<INITIAL SOA>
	<SOA RECORD TO BE DELETED>
	<SOA RECORD TO BE ADDED>

	In general the delta style IXFR response is.

	<FINAL SOA>
	<INITIAL SOA>
	<<DELETIONS> <ADDITIONS>>+

	where <DELETIONS> is
		<NON SOA RECORDS TO BE DELETED>*
		<SOA RECORD TO BE DELETED>
	and <ADDITIONS> in
		<NON SOA RECORDS TO BE ADDED>*
		<SOA RECORD TO BE ADDED>
	
	IXFR has a AXFR style answer mode.

	<FINAL SOA>
	<NON SOA RECORD>+
	<FINAL SOA>
 
	The third type of respone is just
	<CURRENT SOA>
	
	when the query serial is >= current serial or you need to
	move from UDP to TCP for space (or other reasons).
	
> -----Original Message-----
> From: Jeff Stevens [mailto:jstevens at vnet.ibm.com]
> Sent: Wednesday, August 11, 2004 11:09 AM
> To: bind-users
> Subject: bind 8 IXFR 
> 
> 
> If a zone SOA changes even though there are no actual zone changes and IXFR 
> is enabled, will the IXFR still occur?  If there is no IXFR log, does BIND 
> somehow default to doing AXFR?
> 
> Thanks...
> -- 
> Jeffrey Stevens
> 
--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews at isc.org