DHCP / DNS / scavenging

Hello,

I tried to understand how they work together...

On my DHCP server, I leave the default properties for the DHCP lease
duration (8 days). On my DNS server, I leave the default properties
for the zone Aging/Scavenging (no-refresh-interval and refresh
interval to 7 days).

If a computer "A" receive an IP on the 23/12/08 and this computer is
powered-off for 2 weeks, then another computer can receive the same IP
after 8 days. It means, I will have two computer's name pointing to
the same IP after 8 days? After 15 days the scavenging operation will
delete the DNS entry for computer "A"

Does it work this way ?

Thank you.

Chris

Hello Chris,

See here:
http://support.microsoft.com/kb/932464

Also you can use this way:
http://technet.microsoft.com/en-us/l.../cc787034.aspx

Best regards

Meinolf Weber
Disclaimer: This posting is provided "AS IS" with no warranties, and confers
no rights.
** Please do NOT email, only reply to Newsgroups
** HELP us help YOU!!! http://www.blakjak.demon.co.uk/mul_crss.htm


> Hello,
>
> I tried to understand how they work together...
>
> On my DHCP server, I leave the default properties for the DHCP lease
> duration (8 days). On my DNS server, I leave the default properties
> for the zone Aging/Scavenging (no-refresh-interval and refresh
> interval to 7 days).
>
> If a computer "A" receive an IP on the 23/12/08 and this computer is
> powered-off for 2 weeks, then another computer can receive the same IP
> after 8 days. It means, I will have two computer's name pointing to
> the same IP after 8 days? After 15 days the scavenging operation will
> delete the DNS entry for computer "A"
>
> Does it work this way ?
>
> Thank you.
>
> Chris
>

DHCP should delete the record in DNS of Computer A before the DHCP server
will issue that same IP to Computer B.

"Meinolf Weber [MVP-DS]" <meiweb(nospam)@gmx.de> wrote in message
news:ff16fb66121638cb3e6b631eeb3e@msnews.microsoft.com...
> Hello Chris,
>
> See here:
> http://support.microsoft.com/kb/932464
>
> Also you can use this way:
> http://technet.microsoft.com/en-us/l.../cc787034.aspx
>
> Best regards
>
> Meinolf Weber
> Disclaimer: This posting is provided "AS IS" with no warranties, and
> confers no rights.
> ** Please do NOT email, only reply to Newsgroups
> ** HELP us help YOU!!! http://www.blakjak.demon.co.uk/mul_crss.htm
>
>> Hello,
>>
>> I tried to understand how they work together...
>>
>> On my DHCP server, I leave the default properties for the DHCP lease
>> duration (8 days). On my DNS server, I leave the default properties
>> for the zone Aging/Scavenging (no-refresh-interval and refresh
>> interval to 7 days).
>>
>> If a computer "A" receive an IP on the 23/12/08 and this computer is
>> powered-off for 2 weeks, then another computer can receive the same IP
>> after 8 days. It means, I will have two computer's name pointing to
>> the same IP after 8 days? After 15 days the scavenging operation will
>> delete the DNS entry for computer "A"
>>
>> Does it work this way ?
>>
>> Thank you.
>>
>> Chris
>>
>
>

On Jan 7, 10:59 pm, "Jaco Niemand" <Jaco.Niem...@Hotmail.com> wrote:
> DHCP should delete the record in DNS of Computer A before the DHCP server
> will issue that same IP to Computer B.
>
> "Meinolf Weber [MVP-DS]" <meiweb(nospam)@gmx.de> wrote in messagenews:ff16fb66121638cb3e6b631eeb3e@msnews.microsoft.com...
>
> > Hello Chris,
>
> > See here:
> >http://support.microsoft.com/kb/932464
>
> > Also you can use this way:
> >http://technet.microsoft.com/en-us/l.../cc787034.aspx
>
> > Best regards
>
> > Meinolf Weber
> > Disclaimer: This posting is provided "AS IS" with no warranties, and
> > confers no rights.
> > ** Please do NOT email, only reply to Newsgroups
> > ** HELP us help YOU!!!http://www.blakjak.demon.co.uk/mul_crss.htm
>
> >> Hello,
>
> >> I tried to understand how they work together...
>
> >> On my DHCP server, I leave the default properties for the DHCP lease
> >> duration (8 days). On my DNS server, I leave the default properties
> >> for the zone Aging/Scavenging (no-refresh-interval and refresh
> >> interval to 7 days).
>
> >> If a computer "A" receive an IP on the 23/12/08 and this computer is
> >> powered-off for 2 weeks, then another computer can receive the same IP
> >> after 8 days. It means, I will have two computer's name pointing to
> >> the same IP after 8 days? After 15 days the scavenging operation will
> >> delete the DNS entry for computer "A"
>
> >> Does it work this way ?
>
> >> Thank you.
>
> >> Chris

I read the documentation (again) but I still have a few questions :

1 - If I manually delete a client IP address on the DHCP server, does
the DNS entry should be deleted ? I tried but the DHCP server doesn't
seem to update the DNS record, only an ipconfig /release seems to do
the job.

2 - In the DNS configuration : there is two options for DNS dynamic
update : "dynamically update DNS A and PTR records only if requested
by the DHCP client" and "always dynamically update DNS A and PTR
records". What makes/makes not a client request a DNS update ?

3 - I have several WAN sites, with CISCO 800 routers. For each remote
site there is 5 to 10 workstations. The CISCO act as a DHCP server and
deliver the IP address for the workstations. All the IP address are
registered on our "LAN" DNS server. Can I configure the DHCP server
to update the DNS entries in the same manner as a Windows DHCP
server ?

Thank you for your help.

Chris