Set scavenge records = 2 days, is it OK ?

[Guest]

Archived from groups: microsoft.public.win2000.dns (More info?)

My DHCP server lease is set to lease ip addresses = 1 day.

I have tons of multiple hosts that point to same IP addresses on my reverse
lookup zone and I would like to keep those clean.

That said, it is that OK set the DNS server to scavenge stale records = 2
days ?
Currently is set to 7 days.

 

[Guest]

Archived from groups: microsoft.public.win2000.dns (More info?)

I see that I also need to configure "no-refresh" interval and "refresh
interval".
Currently no-refresh and "refresh" intervals = 7 days as well.

Any suggestion on how I can fine tune this to give me the cleanest PTR
records as possible ?
Also, I am considering monitoring server performance to assure I can fine
tune this without causing performance issues.

"Marlon Brown" <marlon_brownj@hotmail.com> wrote in message
news:%2334y$9bLFHA.3788@tk2msftngp13.phx.gbl...
> My DHCP server lease is set to lease ip addresses = 1 day.
>
> I have tons of multiple hosts that point to same IP addresses on my
> reverse lookup zone and I would like to keep those clean.
>
> That said, it is that OK set the DNS server to scavenge stale records = 2
> days ?
> Currently is set to 7 days.
>

 

[Guest]

Archived from groups: microsoft.public.win2000.dns (More info?)

In news:%2334y$9bLFHA.3788@tk2msftngp13.phx.gbl,
Marlon Brown <marlon_brownj@hotmail.com> commented
Then Kevin replied below:
> My DHCP server lease is set to lease ip addresses = 1 day.
>
> I have tons of multiple hosts that point to same IP
> addresses on my reverse lookup zone and I would like to
> keep those clean.
>
> That said, it is that OK set the DNS server to scavenge
> stale records = 2 days ?
> Currently is set to 7 days.

If the lease time in DHCP is one day, it is perfectly reasonable to scavenge
every two days.

--
Best regards,
Kevin D4 Dad Goodknecht Sr. [MVP]
Hope This Helps
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[Guest]

Archived from groups: microsoft.public.win2000.dns (More info?)

Remember that DHCP will clean-up the registrations after itself if you want
it to.

However, why are you using such short lease times? Do you have a large
number of clients and only a small address pool? If not, then consider
increasing the lease time. As I said, DHCP can clean up any DNS
registrations made by itself. Also, in case you're not aware, when a DHCP
client shuts down gracefully it releases its lease. So within 24 hours (the
standard grace period - this is only 4 hours in 2003) that lease is
available for another machine and the record has been removed from DNS.

Many people feel the need to configure short leases because of mobile
workers fluctuating between sites. However, given the fact that a DHCP
client relinquishes its lease at shutdown means that this is a common
misunderstanding and somewhat unnecessary. Also, if you're concerned about
network traffic and performance think about the additional load (granted its
still small) that all of this is adding. Every DHCP lease requires the DNS
updates (read AD changes if we're talking about AD-Integrated zones). Plus
you'd be looking at a somewhat over-zealous scavenging routine if I may say
so. I've been down this road, and didn't have great results. My
over-zealous scavenging routine ended up causing the island DNS problem
every Monday morning for all remote sites <grin>.

--Note. Netlogon is supposed to register SRV records every 12 hours.
However I have seen, and have read others' posts, that this isn't always the
case and scavenging will get rid of 'stale' SRV records too. I believe
there's a fix for 2003, but have seen it reported that it doesn't work...


--

Paul Williams

http://www.msresource.net/
http://forums.msresource.net/

 

[Guest]

Archived from groups: microsoft.public.win2000.dns (More info?)

Good post!

But I have to ask, mainly simply out of curiosity, why you prefer this
option:

> IMO, I think it is a good idea to set the lease time to one day or less.


The only reasons I can see for short-term leases is a high-demand, low
availability IP pool.

This is what the TCP/IP Core Networking Guide recommends.

If you have static workstations and plenty of addresses, MS recommend
increasing the lease duration considerably...


--

Paul Williams

http://www.msresource.net/
http://forums.msresource.net/

 

[Guest]

Archived from groups: microsoft.public.win2000.dns (More info?)

In news:OuXpqoyLFHA.3184@TK2MSFTNGP09.phx.gbl,
ptwilliams <ptw2001@hotmail.com> commented
Then Kevin replied below:
> Good post!
>
> But I have to ask, mainly simply out of curiosity, why
> you prefer this option:

Because especially laptop users who unplug from the network leaving the IP
leased, DHCP won't release the IP leaving the Record registered in DNS.
DHCP will remove the record when the lease expires or is released.


--
Best regards,
Kevin D4 Dad Goodknecht Sr. [MVP]
Hope This Helps
===================================
When responding to posts, please "Reply to Group"
via your newsreader so that others may learn and
benefit from your issue, to respond directly to
me remove the nospam. from my email address.
===================================
http://www.lonestaramerica.com/
===================================
Use Outlook Express?... Get OE_Quotefix:
It will strip signature out and more
http://home.in.tum.de/~jain/software/oe-quotefix/
===================================
Keep a back up of your OE settings and folders
with OEBackup:
http://www.oehelp.com/OEBackup/Default.aspx
===================================

 

[Guest]

Archived from groups: microsoft.public.win2000.dns (More info?)

In message <OuXpqoyLFHA.3184@TK2MSFTNGP09.phx.gbl> "ptwilliams"
<ptw2001@hotmail.com> wrote:

>Good post!
>
>But I have to ask, mainly simply out of curiosity, why you prefer this
>option:
>
>> IMO, I think it is a good idea to set the lease time to one day or less.
>
>
>The only reasons I can see for short-term leases is a high-demand, low
>availability IP pool.

Or frequent changes to DNS, default gateway, or other DHCP-assigned
parameters.


--
I spend a lot of my money on drinks, babes and fast cars.
The rest, I just squander.

 

[Guest]

Archived from groups: microsoft.public.win2000.dns (More info?)

Yes, I suppose that's a good point. And it's not like you can enforce
graceful shutdowns either!!!


--

Paul Williams

http://www.msresource.net/
http://forums.msresource.net/

 

[Guest]

Archived from groups: microsoft.public.win2000.dns (More info?)

In message <OWn2eGzLFHA.3960@TK2MSFTNGP12.phx.gbl> "ptwilliams"
<ptw2001@hotmail.com> wrote:

>Yes, I suppose that's a good point. And it's not like you can enforce
>graceful shutdowns either!!!

Especially not laptop users who may suspend, or may pull the cable
before shutting down.


--
I spend a lot of my money on drinks, babes and fast cars.
The rest, I just squander.

 

[Guest]

Archived from groups: microsoft.public.win2000.dns (More info?)

In news:OWn2eGzLFHA.3960@TK2MSFTNGP12.phx.gbl,
ptwilliams <ptw2001@hotmail.com> commented
Then Kevin replied below:
> Yes, I suppose that's a good point. And it's not like
> you can enforce graceful shutdowns either!!!

What can you do with Laptops that are just unplugged without releasing the
IP lease. How can you stop that?
Have windows give them a shock if you touch the network cable without
releasing the IP address?

--
Best regards,
Kevin D4 Dad Goodknecht Sr. [MVP]
Hope This Helps
===================================
When responding to posts, please "Reply to Group"
via your newsreader so that others may learn and
benefit from your issue, to respond directly to
me remove the nospam. from my email address.
===================================
http://www.lonestaramerica.com/
===================================
Use Outlook Express?... Get OE_Quotefix:
It will strip signature out and more
http://home.in.tum.de/~jain/software/oe-quotefix/
===================================
Keep a back up of your OE settings and folders
with OEBackup:
http://www.oehelp.com/OEBackup/Default.aspx
===================================

 

[Guest]

Archived from groups: microsoft.public.win2000.dns (More info?)

Of course, constant changes to those things imply much bigger problems than
scavenging routines.

--
Ryan Hanisco
MCSE, MCDBA
FlagShip Integration Services
Chicago, IL

"DevilsPGD" <ihatespam@crazyhat.net> wrote in message
news:m3a141h4jmm9l5s1n3ku393q4d8crsu53b@beta.readfreenews.net...
> In message <OuXpqoyLFHA.3184@TK2MSFTNGP09.phx.gbl> "ptwilliams"
> <ptw2001@hotmail.com> wrote:
>
>>Good post!
>>
>>But I have to ask, mainly simply out of curiosity, why you prefer this
>>option:
>>
>>> IMO, I think it is a good idea to set the lease time to one day or less.
>>
>>
>>The only reasons I can see for short-term leases is a high-demand, low
>>availability IP pool.
>
> Or frequent changes to DNS, default gateway, or other DHCP-assigned
> parameters.
>
>
> --
> I spend a lot of my money on drinks, babes and fast cars.
> The rest, I just squander.

 

[Guest]

Archived from groups: microsoft.public.win2000.dns (More info?)

In message <ezxjWd4LFHA.3076@TK2MSFTNGP14.phx.gbl> "Ryan Hanisco"
<rhanisco@flagshipis.com> wrote:

>Of course, constant changes to those things imply much bigger problems than
>scavenging routines.

Yeah, sometimes. On the other hand, when you have a small network
budget you sometimes get stuck with older junk and have to make do.


--
I'd give my right arm to be ambidextrous.

 

[Guest]

Archived from groups: microsoft.public.win2000.dns (More info?)

"Marlon Brown" <marlon_brownj@hotmail.com> wrote in message
news:#34y$9bLFHA.3788@tk2msftngp13.phx.gbl...
> My DHCP server lease is set to lease ip addresses = 1 day.
>
> I have tons of multiple hosts that point to same IP addresses on my
reverse
> lookup zone and I would like to keep those clean.
>
> That said, it is that OK set the DNS server to scavenge stale records = 2
> days ?
> Currently is set to 7 days.

If you have WANS involved it is a VERY POOR setting.

You want the norefresh + refresh (and scavenging) to be
MUCH longer than both the DHCP lease periods AND
the "reasonable expected outage" of your WANS lines.

If two DCs get out of contact for long enough and are
holding the DNS records in AD, then they will scavenge
each other and thus lose contact (semi)permanently.

"semi" means that you CAN fix it but it will be a pain.

Keep such settings LONG -- unless you have a specific
reason and full understanding of ALL the implications set
it to at least the defaults of 7 days + 7 days (+ 7 days)
giving about 2 1/2 weeks on average.

Don't tempt fate by making it short.

 

[magoo]

Archived from groups: microsoft.public.win2000.dns (More info?)

How about if I delete only the "reverse" lookup zones more frequently ? As
long as I keep my "Forward Lookup" with perhaps 6,6,6 that shouldn't be a
problem in case of DC's go down over WAN links and can't sync ? As far as I
know AD doesn't rely on PTR records.


"DevilsPGD" <ihatespam@crazyhat.net> wrote in message
news:vvj341hn6hhba261cu6tunjvgsmktvrt1b@beta.readfreenews.net...
> In message <ezxjWd4LFHA.3076@TK2MSFTNGP14.phx.gbl> "Ryan Hanisco"
> <rhanisco@flagshipis.com> wrote:
>
>>Of course, constant changes to those things imply much bigger problems
>>than
>>scavenging routines.
>
> Yeah, sometimes. On the other hand, when you have a small network
> budget you sometimes get stuck with older junk and have to make do.
>
>
> --
> I'd give my right arm to be ambidextrous.