do I need reverse lookup?

[edgar]

I am relatively new to MS DNS on 2003, but I must say
that it's not as difficult as I thought...so I think!
So far I've installed DNS with both forward and reverse
lookup zones. First question, do I need a reverse lookup
zone? I thought just by selecting the PTR check box, it
would create a reverse lookup? Second, after the initial
install of dns and adding my first lookup
zone "company.com", why did it also add:
_sites
_tcp
_udp
DomainDnsZones
ForestDnsZones
TAPI3Directory

what is all this? when i need to add a host, I just
click on the zone I created then choose new host(A), why
do i need all these subfolders.

[Simon Geary]

If you want a reverse lookup zone you have to create it manually. RLZ's are
not always necessary in a network but you are as well creating one anyway.
They are not created automatically.

The first five of the subfolders are called SRV records and they are used by
Active Directory. They are very important so don't change or delete them.

I have never heard of a TAPI3Directory subfolder in DNS. It may have been
created by an application you have?

"edgar" <edgar....@designory.com> wrote in message
news:027a01c361b6$b9857820$a101...@phx.gbl...

[edgar]

what exactly are these subfolders used for? can I modify
them or should I never touch them? By the way, I did
create a few reverse lookup zones. would you recommend
creating a rev-lookup zone for every subnet/vlan...we
actually have 5 vlans here? and would you recommend
checking the prt record check box when creating a new
host.

>.
>

[Simon Geary]

The subfolders are the Active Directory SRV records. They are used by
clients to locate Domain Controllers and Global Catalogues (among other
things). Without these folders, clients would not be able to log on. Don't
ever manually change them unless you know exactly what you are doing.
Probably best if you just leave them alone. This KB describes them in more
detail. http://support.microsoft.com/?id=232025

Reverse lookup zones are optional unless you have an application that relies
on them eg some mail servers. I personally always create them. You probably
don't need one for each subnet, just create one high level zone such as
10.x.x.x or 192.168.x.x that will cover everything.

Again, checking the box to create a PTR record is optional. You need to go
through your list of applications and determine if any of them require an
RLZ. One problem is that PTR records do not get deleted by dynamic DNS in
the same way that A records do so it's possible to end up with multiple PTR
records for the same host.

"edgar" <edgar....@designory.com> wrote in message

news:031201c361bc$c5bc1710$a101...@phx.gbl...

[Wayne Taylor]

Can any one explain reverse lookup? and why it would benfit my network?

Do you need to know my setup?

Thanks, In advance, Wayne

"edgar" <edgar....@designory.com> wrote in message
news:027a01c361b6$b9857820$a101...@phx.gbl...

[Simon Geary]

A reverse lookup allows you to translate an IP address like 192.168.0.1 to
an FQDN like server.domain.com. A traditional forward lookup works the other
way around, ie resolves an FQDN to an IP address. You do not require one
unless you have an application that needs it or have a pressing desire to do
reverse lookups yourself.

"Wayne Taylor" <w...@kryptos.co.uk> wrote in message
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