How to compute db.192.168.x names from network addresses ?

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How to compute db.192.168.x names from network addresses ?

Olivier
Hello,

Here or there, you can read configuration files named like db.192.168.42 when holding data for a 192.168.42.0/24 network.
For networks with a /24 mask, simply striping  ending 0/24 substring from 192.168.42.0/24 is enough.
But what about network with a different prefix ?

1. How can you compute this "db.192.168.whatever" from 192.168.x.y/z network address ?
Example in Python would be appreciated.

2. Instead of using short "db.192.168.42" names, I used a long "db.192.168.42.0". I didn't notice any issue. Did I overlooked something ?

Best regards

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Re: How to compute db.192.168.x names from network addresses ?

Matus UHLAR - fantomas
On 01.10.20 17:46, Olivier wrote:
>Here or there, you can read configuration files named like db.192.168.42
>when holding data for a 192.168.42.0/24 network.
>For networks with a /24 mask, simply striping  ending 0/24 substring from
>192.168.42.0/24 is enough.
>But what about network with a different prefix ?

RFC
2317 Classless IN-ADDR.ARPA delegation. H. Eidnes, G. de Groot, P. Vixie.
     March 1998. (Format: TXT=17744 bytes) (Also BCP0020) (Status: BEST
     CURRENT PRACTICE) (DOI: 10.17487/RFC2317)


>1. How can you compute this "db.192.168.whatever" from 192.168.x.y/z
>network address ?

better set up reverse zones 192.168.0, 192.168.1 etc.
the RFC above should be only used for  <24 ranges.

>Example in Python would be appreciated.
>
>2. Instead of using short "db.192.168.42" names, I used a long
>"db.192.168.42.0". I didn't notice any issue. Did I overlooked something ?

it's just a file name.  You can use "myrevzone" as long, but using
db.192.168.42 is much more explanatory.

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