reverse lookup example

Mark Andrews Mark_Andrews at isc.org
Fri Feb 24 21:05:26 UTC 2006


> The following is a sample SOA record.  The subnet mask
> for this example would be 255.255.255.128.  My
> question is what does the 0/24 portion of the
> configuration suppose to represent?  Thank you in
> advance.

	Well it would normally be 0/25.

	<first octet in range>/<one bits in netmask>. 

	It's just a way of generating a label different from 0.

	Alteratives are 0-127, <first octet in range>-<last octet in range>.

	Just plain 0, but people get confused when that see 5 octets.

	It really doesn't matter what it is as log as the CNAME
	which map from the well known name to the new names exist.

	Mark
 
> 0/24.152.45.42.in-addr.arpa. IN SOA host.domain.com.
> root.host.domain.com. (
> 2005112801 ; Serial
> 7200       ; Refresh after 3 hours
> 3600       ; Retry after 1 hour
> 604800     ; Expire after 1 week
> 172800 )   ; Minimum TTL of 2 days
> 
> 
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--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews at isc.org



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