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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