[afnog] reverse dns implications

[Makan SIMAGA]

Hi all,

 

If you configure a DNS for “mydomain.com” for example with IP address
192.168.1.2/24, in your reverse zone file, you must have

1.168.192.in-addr.arpa for the reverse resolution.

This mean all IP addresses in the bloc 192.168.1.0/24 could be reversely
resolved by your DNS server.

 

If you just have one public IP address from your ISP, and make DNS Server
this mean that the /24 bloc which include this public address will be
reversely resolved by your reverse DNS zone file.

The IP addresses from that  /24 bloc could be assigned to another customer
by your ISP. If this customer make his DNS server with reverse zone, there
will certainly have a problem with your DNS reverse resolution !

 

How can we do to avoid this problem?

 

Thanks!

 

Makan SIMAGA

Bureau du Vérificateur Général du Mali

www.bvg-mali.org

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