Delete DNS

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If I decided to re-subnet the network from 255.255.255.0 to 255.255.254.0 do
I need to delete any DNS entries or will they automatically get updated.
 
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Steve said:
If I decided to re-subnet the network from 255.255.255.0 to
255.255.254.0 do I need to delete any DNS entries or will they
automatically get updated.
Click to expand...

You just need to change the mask on every machine. In regards to your
Forward Lookup Zones, no, nothing gets changed. As for your Reverse Lookup
Zone, yes, you need to delete that, and recreate it with the new subnet.

174419 - HOW TO Configure a Subnetted Reverse Lookup Zone:
http://support.microsoft.com/?id=174419


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Ace

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Ace Fekay, MCSE 2003 & 2000, MCSA 2003 & 2000, MCSE+I, MCT, MVP
Microsoft Windows MVP - Windows Server - Directory Services

Security Is Like An Onion, It Has Layers
HAM AND EGGS: A day's work for a chicken;
A lifetime commitment for a pig.
 
Hi

You'll probably want to run

ipconfig /registerdns
net stop netlogon
net start netlogon

on your domain controllers so that clients can find them. If you're running
Windows 2000/XP clients or you've got DHCP configured to dynamically
register records for downlevel clients and DNS is configured to accept
dynamic updates, you shouldn't need to worry about anything else.

HTH
--
Mark Renoden [MSFT]
Windows Platform Support Team
Email: (e-mail address removed)

Please note you'll need to strip ".online" from my email address to email
me; I'll post a response back to the group.

This posting is provided "AS IS" with no warranties, and confers no rights.

"Ace Fekay [MVP]"
 
What if the IP's scheme isnt changing and its only the subnet address that
is. Do I still need to delete the reverse lookup? What about Wins, what do
I need to do there?

Mark Renoden said:
Hi

You'll probably want to run

ipconfig /registerdns
net stop netlogon
net start netlogon

on your domain controllers so that clients can find them. If you're running
Windows 2000/XP clients or you've got DHCP configured to dynamically
register records for downlevel clients and DNS is configured to accept
dynamic updates, you shouldn't need to worry about anything else.

HTH
--
Mark Renoden [MSFT]
Windows Platform Support Team
Email: (e-mail address removed)

Please note you'll need to strip ".online" from my email address to email
me; I'll post a response back to the group.

This posting is provided "AS IS" with no warranties, and confers no rights.

"Ace Fekay [MVP]"
Click to expand...
 
Steve said:
What if the IP's scheme isnt changing and its only the subnet address that
is.
Click to expand...

Actually the IP range is the "subnet address" range and what
you seem to be changing is the SUBNET MASK which helps
to define the subnet range (along with those addresses.)
Do I still need to delete the reverse lookup?
Click to expand...

Probably and it's not that big a deal anyway.
What about Wins, what do I need to do there?
Click to expand...

Probably nothing -- other than make sure EVERY MACHINE
knows about the change.

BTW, in today's world, there is almost never a (really good)
reason for doing what you propose.

You are changing you network from allowing 250+ addresses
on the subnet to allowing 500+ addresses on the subnet.

Do you really have a/any subnet(s) with more than 250 machines?
 
Thanks Herb for the info.

We actually do have 240 machines and will be adding more. Plus we are
moving to a wan between all properties and we are trying to get all subnets
the same.

As for Wins, we only have about 8 pre windows 2000 so I am not to worried
about that.
 
Steve said:
Thanks Herb for the info.

We actually do have 240 machines and will be adding more. Plus we are
moving to a wan between all properties and we are trying to get all subnets
the same.
Click to expand...

All subnets the same (makes no sense) or all subnet
masks the same (normally done that way but not
absolutely essential)?

You should like KEEP you mask at 255.255.255.0
and provide routers between groups (i.e., Subnets)
of no more than 250 machines.
As for Wins, we only have about 8 pre windows 2000 so I am not to worried
about that.
Click to expand...

You still need WINS for even Win2003 network in
practically every case IF you have more than one
subnet.

Otherwise cross subnet (and cross domain if you have
more than one) BROWSING will fail in most every
case, plus about a dozen other little things won't work.

If you have a Microsoft network of more than on IP
subnet you need WINS Server(s).
 
You still need WINS for even Win2003 network in
practically every case IF you have more than one
subnet.

Otherwise cross subnet (and cross domain if you have
more than one) BROWSING will fail in most every
case, plus about a dozen other little things won't work.

If you have a Microsoft network of more than on IP
subnet you need WINS Server(s).
Click to expand...

sorry to hijack this section .... ive a situation on our single domain
that has 20+ subnets all over various wan links where the admin has
decided we no longer require wins and has disabled wins on the central
wins server (the one all other wins servers were replicating with)

we also have several exch2k box's

other than browsing no longer working what other fun situations should i
be on the lookout for?
 
jas0n said:
sorry to hijack this section .... ive a situation on our single domain
that has 20+ subnets all over various wan links where the admin has
decided we no longer require wins and has disabled wins on the central
wins server (the one all other wins servers were replicating with)

we also have several exch2k box's

other than browsing no longer working what other fun situations should i
be on the lookout for?
Click to expand...

Browsing across subnets and proably across domains
will break.

External trusts will not work (generally).

Some Cluster and Exchange minor issues.

You cannot assign specific machine Logon restrictions
(restrict user to these machines)

A few other small things -- I wouldn't mind seeing a
full (more full) list myself.

But the biggy is browsing. You really ready to give up
browsing?
 
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