DHCP Clients with Rembo Loose Addresses.

Joe Polcari jpolcari at bluesocket.com
Tue Jun 10 20:05:40 UTC 2008


ping-check and
ping-timeout 

-----Original Message-----
From: dhcp-users-bounce at isc.org [mailto:dhcp-users-bounce at isc.org] On
Behalf Of Simon Hobson
Sent: Tuesday, June 10, 2008 3:53 PM
To: dhcp-users at isc.org
Subject: Re: DHCP Clients with Rembo Loose Addresses.

Martin McCormick wrote:
>	In a public lab, client computers boot and get a DHCP dynamic
lease. 
>They then get a download from a Rembo server and boot again under 
>Windows. During the second boot, DHCPD pings the  address they  just 
>got and the interface answers, causing DHCPD to abandon that lease for 
>another one.

Broken client ?

>	The net effect is that  everybody's address constantly changes
and our 
>logs fill with messages like:
>
>  dhcpd: Abandoning IP address 139.78.99.9: pinged before offer
>
>	Then, they get another address which they loose on the next
boot.
>
>	Short of making all 400 machines static bootP, is there anything
else 
>we can do to correct this situation?
>
>	It appears that the network interface is still alive at the time
of 
>the second boot which causes  DHCPD to abandon the address.
>
>	Normally, the ping before offer step is a vey good thing, but in
this 
>case, no good deed goes unpunished.

You can turn it off. But the correct way is to fix the broken client.

Look in 'man dhcpd.conf' for ping-before-offer IIRC.



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