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axfr-get(8)		    System Manager's Manual		   axfr-get(8)

       axfr-get	- a DNS	zone-transfer client.

       It  sends  a zone-transfer request in DNS-over-TCP format to descriptor
       7, reads	the results from descriptor 6, and  saves  the	results	 in  a

       Normally	 axfr-get is run under tcpclient(1), which sets	up descriptors
       6 and 7 as a TCP	connection to a	remote host.

       axfr-get	z fn fn.tmp

       axfr-get	performs a zone	transfer for domain z.	It writes the  results
       to fn.tmp in a format that can be used as input to tinydns-data(8).  If
       the zone	transfer completes successfully, axfr-get  atomically  renames
       fn.tmp as fn.

       fn.tmp and fn must be on	the same filesystem.

       axfr-get	 writes	 the  zone  serial  number  as a comment at the	top of
       fn.tmp.	It skips the zone transfer, leaving fn alone,  if  fn  already

       fn has a	serial number matching the zone	serial number, and both	serial
       numbers are nonzero.

       Zone transfers often include duplicate records.	You  should  feed  the
       axfr-get	results	through	sort -u.

       axfr-get	discards all records outside the domain	z.  It accepts records
       in child	zones, but it marks all	child zones as	non-authoritative,  so
       tinydns(8)  will	 not report those records except as glue.  If you plan
       to merge	the axfr-get results for a domain and a	child of the same  do-
       main, creating a	file authoritative for both zones, make	sure to	elimi-
       nate records in the first output	that are within	the child zone.

       axfr-get	will accept arbitrarily	large zone transfers.	To  limit  the
       maximum	file  size  to	1  megabyte,  run  axfr-get under softlimit -f

Compatibility notes
       axfr-get	handles	BIND's RFC-1034-violating multiple-answers zone-trans-
       fer format.

       axfr-get	 does  not precisely simulate BIND's handling of *.dom.	 Under
       BIND, records for *.dom do not apply  to	 y.dom	or  anything.y.dom  if
       there  is  a  normal record for x.y.dom.	 With axfr-get and tinydns(8),
       the records apply to y.dom and anything.y.dom except x.y.dom.

       axfr-get	does not precisely simulate BIND's handling of multiple	IP ad-
       dresses	for  a	single	name.	When  there are	more than 8 addresses,
       tinydns(8) selects a random set of 8 for	each query.

       axfrdns(8),  tinydns(8),	 tinydns-data(8),  tcpclient(1),  softlimit(8)


NAME | SYNOPSIS | DESCRIPTION | Compatibility notes | SEE ALSO

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