[SunHELP] DNS reverse lookups

[James, Denise]

Maybe this will help with.

http://www.faqs.org/rfcs/rfc2317.html



-----Original Message-----
From: sunhelp-bounces at sunhelp.org [mailto:sunhelp-bounces at sunhelp.org]
On Behalf Of Steve
Sent: Tuesday, September 06, 2005 12:37 PM
To: The SunHELP List
Subject: Re: [SunHELP] DNS reverse lookups

Lara Matthews wrote:
> Hi
>
> I wonder if anyone can help me.
>
> I can't seem to do reverse lookups on my mail server.
>
> I think the reverse file is correct but I am guessing something is
wrong.
>
> Any pointers would be appreciated.
>
> Below is the file:
> ; /var/named/rev.213.128.229
> ;
> $TTL 1D   ; Default TTL in secs(1 day)
>
> @       IN SOA ns.accesscomputing.co.uk.
hostmaster.accesscomputing.co.uk. (
>          2005090201      ; Serial number yyyymmddvv
>          10800   ; Refresh  (3, was 8 hours)
>          3600    ; Retry (1, was 2 hours)
>          604800  ; Expire (7 days)
>          86400   ; Minimum
> )
> ;
>
> ; Descriptions of name servers for this domain
>          IN      NS      ns.accesscomputing.co.uk.
>
> ;
> ; Addresses point to canonical names
> ;
> 177.128.229.213.in-addr.arpa. IN NS ns.accesscomputing.co.uk.
> 179.128.229.213.in-addr.arpa. IN PTR mailhost.accesscomputing.co.uk.
> 177 IN PTR ns.accesscomputing.co.uk.
> 177 IN PTR accesscomputing.co.uk.
> 179 IN PTR mailhost.accesscomputing.co.uk.
> 177 IN PTR calhost.accesscomputing.co.uk.
> 180 IN PTR www.accesscomputing.co.uk.
> 181 IN PTR www.thalamus.co.uk.
> 181 IN PTR www.gingiber.com.
>
> ;eof
> $

I don't entirely understand how to set up reverse loookups for a partial

class C, that is a CIDR subnet. If that is what you are trying to do,
there may be special rules or notation redquired.

However, it does appear that you have duplicate entries for certain IP
addresses, and I don't believe that is allowed.

The PTR records I have on BIND boxes are all
xxx	IN	PTR	hostname.domain.ext.
where xxx is the last octet of the IP.

Steve


Steve
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