[cs615asa] (no subject)

Jan Schaumann jschauma at cs.stevens.edu
Sun Mar 22 16:06:23 EDT 2009


Ujwal Dilip Trivedi <utrivedi at stevens.edu> wrote:
> Hi,
> 
>    Some of the fields in DNS zone file are
> 			A	75.126.233.107
> 			A	75.126.233.108
> 			A	75.126.233.109
> 			A	75.126.233.110
> 
> AND
> 
> ;dns3.ad		IN	A	194.158.64.9
> ;dns4.ad		IN	A	194.158.64.10
> 
> 
> What should be the output of the script..should it be No output for   
> the fields for
> 
> 	A	75.126.233.110

No, for these lines you'd have to output the hostname of the previous
line.  That is, a hostname can have multiple A (or AAAA) records, and
records need not be on the same line as the hostname.

foo.bar		A 75.126.233.107
		A 75.126.233.108
		A 75.126.233.109

and

foo.bar		MX 75.126.233.1
		A 75.126.233.107
		A 75.126.233.108
		A 75.126.233.109

would both yield

foo.bar 75.126.233.107
foo.bar 75.126.233.108
foo.bar 75.126.233.109

> and 
> 
>    dns4.ad 194.158.64.10
> 
> for 
> 
> ;dns4.ad		IN	A	194.158.64.10

';' is a comment characters in the zone file.  That is, anything
following a ';' is ignored, so there should be no output for this
hostname.

-Jan
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