RE: [ActiveDir] DNS Scavenging and DHCP Lease Expiration Times

[Joe]

Title: Message

<eg>

It is fine until the time DHCP doesn't respond. :op

 

I would expect though unless you have way more nodes than IP addresses you will find people getting the same IP's over and over. My laptop seems to get the same three IP addresses in the three locations I go to (home building wired, dev building wireless, dev building wired).

 

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Roger Seielstad
Sent: Tuesday, September 02, 2003 11:22 AM
To: '[EMAIL PROTECTED]'
Subject: RE: [ActiveDir] DNS Scavenging and DHCP Lease Expiration Times

<Quietly hides the 4 hour lease time on his DHCP scopes>

Actually, I advocate the shorter the better, but my environment is predominantly laptops. Between people moving across our subnets, and more often people taking their laptops onto home networks (or other corporate networks, as the case may be). The net effect is that every time the clients change networks, they basically lose the ability to recover their prior lease (at least 50% of the time, if the DHCP server isn't entirely brain dead). At that point, you've got a lot of leases that are left hangling.

Then again, there is precious little traffic generated in DHCP transactions, so a short lease time isn't buying a significant jump in network traffic, either.

--------------------------------------------------------------
Roger D. Seielstad - MTS MCSE MS-MVP
Sr. Systems Administrator
Inovis Inc.

>  -----Original Message-----
> From:         Joe [mailto:[EMAIL PROTECTED]]
> Sent: Sunday, August 31, 2003 9:31 AM
> To:   [EMAIL PROTECTED]
> Subject:      RE: [ActiveDir] DNS Scavenging and DHCP Lease
> Expiration Times
>
> None to me either.
>
> However that DHCP lease time seems short. How many DHCP
> servers do you have per site? With that lease time you should
> probably have a couple or a guarantee to be able to not have
> an outage of the server greater than 3 days or more
> preferably (to me) more than 1.5 days - lease half-life.
>
> About the only time I would recommend to anyone to go below
> 7-14 days on lease times is if they are trying to switch
> values for some of the networking components through DHCP.
>
> What is the idea behind the 3 day lease time?
>
>    joe
>
>

>  -----Original Message-----
> From:         [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]  On Behalf Of
> Rick Kingslan
> Sent: Saturday, August 30, 2003 12:32 PM
> To:   [EMAIL PROTECTED]
> Subject:      RE: [ActiveDir] DNS Scavenging and DHCP Lease
> Expiration Times
>
> None that occur to me off the top of my head.
>
> Rick Kingslan  MCSE, MCSA, MCT
> Microsoft MVP - Active Directory
> Associate Expert
> Expert Zone - www.microsoft.com/windowsxp/expertzone
> 
>
>
> _____________________________________________
> From:         [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]  On Behalf Of Marcus Oh
> Sent: Friday, August 29, 2003 4:56 PM
> To:   [EMAIL PROTECTED]
> Subject:      [ActiveDir] DNS Scavenging and DHCP Lease
> Expiration Times
>
> Hey folks,
>
> Our DNS scavenging cycle is 7 days.  Our DHCP leases expire
> every 3 days.  Are there any notable drawbacks or problems in
> changing the DNS scavenging time period to match the DHCP
> lease expiration time period?
>
> Thanks!
>
> Marcus