DHCP Clients with Rembo Loose Addresses.

Simon Hobson dhcp1 at thehobsons.co.uk
Tue Jun 10 19:52:51 UTC 2008


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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