DNS Access

[Mark_Andrews at isc.org]

> Having looked at now 1033, 1034 and 1035 with more time
> 
> I have come to understand in part the Header section Format ; Question
> Section Format & Resource Record Format. (helped trapping a packet with a
> DNS query)
> 
> The request had a Header with an:
> ID            of 8133
> Param      of 0256 from what I understand that is an RA = 1 all others  = 0
> QDCount of 0001
> ANCount of 0000
> NSCount of  0000
> Question how is the ID created (Random number I'm guessing??)

	Yes.

>                how is the Checksum created ?

	There is no checksum at the DNS level

> 
> This was a single request TYPE = 255 and CLASS = 1 using UDP
> 
> How What would one set the
> ID, Param, QDCount, ANCount, NSCount & TYPE and CLASS to in order to do a
> TCP
> Zone Transfer request??
> 
> I couldn't work this out from the 1033 -> 1035 text information?

	It's there.  I suggest that you re-read them again.  A zone
	transfer is requested using type AXFR.
	See RFC 1034: Section 4.3.5. Zone maintenance and transfers

	Mark

> Anyone have an Idea?
> Thanks In advance
> 
> Barry
> 
> 
--
Mark Andrews, Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark.Andrews at isc.org