asked on

reverse lookup zone

Hi,
I have a small network with 7 servers.
But when I check my 1. dns no reverse look up zone is installed and on the 2. dns also not.
Is it not necesarry ?

Kieran_Burns

It's not necessary, but very useful.
I've always created the basic RDNS zones manually anyway. Just note what your main subnets are and create the zones. they will be populated as soon as any workstation or device communicates with the DNS servers

Eprs_Admin

ASKER

Can you explain, why it is very helpful ?
What is the benefit ?

Kieran_Burns

DNS maps the name of a device to the IP address, RDNS does just the opposite - maps the IP to the name
So if you know the IP address of a device and want to know what the NAME of it is: RDNS does this for you
If you use NSLOOKUP and put in the IP address you will get the name - but only if you have the zones created.

Eprs_Admin

ASKER

ok thanks.
So its no problem when I enter now my reverse lookup zone.
Right ?

ASKER CERTIFIED SOLUTION

Kieran_Burns

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Eprs_Admin

ASKER

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Eprs_Admin

ASKER

I have one more question.
I have 3 reverse lookup zones installed, but not from me.
They are standard primary zones.

1. 0.in-addr.arpa
2. 127.in-addr.arpa
3. 255.in-addr.arpa

What about this zones ? For what do I need them ?

Kieran_Burns

they are standard pre-defined subnets - and can actually be removed but personally i would leave them

Eprs_Admin

ASKER

Thanks a lot.