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I machine (DHCP Server) with fixed IP (192.168.1.1)
2 others set to IP by DHCP (issued 192.168.1.11 and 12)
All W2k
DHCP range set to 192.168.10 to .14 lease time 720min

Once each machine has got an IP I shoukld not see any more DHCP traffic
till either a new machine connects, an old machine reconnects of the
lease expires. Am I correct in this.

The reason I ask is I am seeing requests from one machine (192.168.11)
for both that IP and .12 (Mac address confirms the request)


--
>>Follow ups may be set to a single group when appropriate!
================================================== ====================
| Local 40.9000°S, 174.9830°E |
================================================== ====================
"I used to jog, but the ice kept bouncing out of my glass."
"With sufficient thrust, pigs fly just fine......
However, this is not necessarily a good idea...."

Collector»NZ <> provided this moment of
wisdom....

>I machine (DHCP Server) with fixed IP (192.168.1.1)
>2 others set to IP by DHCP (issued 192.168.1.11 and 12)
>All W2k
>DHCP range set to 192.168.10 to .14 lease time 720min
>
>Once each machine has got an IP I shoukld not see any more DHCP traffic
>till either a new machine connects, an old machine reconnects of the
>lease expires. Am I correct in this.
>
>The reason I ask is I am seeing requests from one machine (192.168.11)
>for both that IP and .12 (Mac address confirms the request)


Eekk, I should know this.

Without researching (just taking a stab), maybe the DHCP server is
polling the clients to see if they're still there, and the clients are
replying - hence the traffic?

Aslo, try releaseing & renewing the IP and see if that stops it.

--

Ryan Jacobs said the following on 9/02/2005 1:26 p.m.:
> Collector»NZ <> provided this moment of
> wisdom....
>
>
>>I machine (DHCP Server) with fixed IP (192.168.1.1)
>>2 others set to IP by DHCP (issued 192.168.1.11 and 12)
>>All W2k
>>DHCP range set to 192.168.10 to .14 lease time 720min
>>
>>Once each machine has got an IP I shoukld not see any more DHCP traffic
>>till either a new machine connects, an old machine reconnects of the
>>lease expires. Am I correct in this.
>>
>>The reason I ask is I am seeing requests from one machine (192.168.11)
>>for both that IP and .12 (Mac address confirms the request)
>
>
>
> Eekk, I should know this.
>
> Without researching (just taking a stab), maybe the DHCP server is
> polling the clients to see if they're still there, and the clients are
> replying - hence the traffic?
>
> Aslo, try releaseing & renewing the IP and see if that stops it.
>
Okay the request comes from the client not the server and I have been
down the release renew path

--
>>Follow ups may be set to a single group when appropriate!
================================================== ====================
| Local 40.9000°S, 174.9830°E |
================================================== ====================
"I used to jog, but the ice kept bouncing out of my glass."
"With sufficient thrust, pigs fly just fine......
However, this is not necessarily a good idea...."

On Wed, 09 Feb 2005 13:19:39 +1300, Collector»NZ wrote:

> Once each machine has got an IP I shoukld not see any more DHCP traffic
> till either a new machine connects, an old machine reconnects of the lease
> expires. Am I correct in this.

Nope, the clients should reconfirm their lease with the server at 50% of
the lease time, and again at 75%. From hazy memory the 75% query might
only happen if they get no response from the 50% one, but I forget

Even with DHCP most computers will renew with the same IPs through many
leases unless they are off for extended periods.

--
Cheers
Anton

On Wed, 09 Feb 2005 13:49:29 +1300, AD. wrote:

> On Wed, 09 Feb 2005 13:19:39 +1300, Collector»NZ wrote:
>
>> Once each machine has got an IP I shoukld not see any more DHCP traffic
>> till either a new machine connects, an old machine reconnects of the
>> lease expires. Am I correct in this.
>
> Nope, the clients should reconfirm their lease with the server at 50% of
> the lease time, and again at 75%. From hazy memory the 75% query might
> only happen if they get no response from the 50% one, but I forget
>
> Even with DHCP most computers will renew with the same IPs through many
> leases unless they are off for extended periods.

OK, so I went and looked it up:

http://www.comptechdoc.org/independe...e/netdhcp.html

The 75% time is actually 87.5%

--
Cheers
Anton