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List:       dhcp-server
Subject:    Re: Antw: Re: Ping Check befor delete
From:       Glenn Satchell <Glenn.Satchell () uniq ! com ! au>
Date:       2003-01-31 10:15:02
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I think you're missing the point, which is why aren't your clients
renewing their lease? This is not a specific win2k issue as I look
after a site with some 4000 Win2k clients and they renew their leases
correctly.

Remember that the initial request is broadcast by the client then
forwarded directly to the dhcp server by the dhcp relay agent (this may
be a unix box or more commonly a router).

When it renews, the client will talk directly to the dhcp server,
bypassing the relay agent. Most clients try to renew the lease when it
is 50% expired, thus the dhcp server should never delete the lease if
the client is renewing correctly.

Do you have any firewall or router rules that prevent the clients from
talking directly to the dhcp server?

Can you run snoop or tcpdump on the network interface on the dhcp
server and see if there are packets coming from clients trying to
renew?

What is in the logs? You should see DHCPDISCOVER followed by DHCPOFFER
for the initial request, then DHCPREQUEST and DHCPACK for the renews.

regards,
-glenn
--
Glenn Satchell              mailto:glenn@uniq.com.au  ((* <- That's me
Uniq Advances Pty Ltd         http://www.uniq.com.au  *))    skiing the
PO Box 70 Paddington NSW Australia 2021               ((*    slalom!
Mobile 0409 458 580 Ph 02 9380 6360 Fax 02 9380 6416  *X* 


> X-Original-To: dhcp-server@isc.org
> Date: Fri, 31 Jan 2003 10:57:27 +0100
> From: "Thomas Zenz" <Thomas.Zenz@oenb.co.at>
> To: <dhcp-server@isc.org>
> Subject: Antw: Re: Ping Check befor delete
> X-ecartis-version: Ecartis v1.0.0
> X-original-sender: Thomas.Zenz@oenb.co.at
> X-List-ID: <dhcp-server.isc.org>
> 
>    *** From dhcp-server -- To unsubscribe, see the end of this message. ***
> 
> 
> The problem is not a release on shutdown of the machine. The problem is,
> that the machine is still running and the DNS entry is deleted.
> Specially within the Sync time between primary and secondary DHCP.  The
> Client must sent a renew and doese not. So the Server thinks the Client
> is turned off and deletes the DNS entry :((
> 
> rg
> Tom
> 
> >>> tonyw@reynolds.com.au 30.01.2003 23:15:46 >>>
>    *** From dhcp-server -- To unsubscribe, see the end of this message.
> ***
> 
> 
> Double check the archives and the M$ site. This problem has been
> discussed
> several times. Look for references to release on shutdown.
> 
> Regards,
> 
> T.
> 
> ----- Original Message -----
> From: "Thomas Zenz" <Thomas.Zenz@oenb.co.at>
> To: <dhcp-server@isc.org>
> Sent: Friday, January 31, 2003 2:29 AM
> Subject: Ping Check befor delete
> 
> 
> >    *** From dhcp-server -- To unsubscribe, see the end of this
> message.
> ***
> >
> >
> > Hey all,
> >
> > We still have the Problem, that w2k client do not renew their
> > IP-Address. So the Sever delets th DDNS eintry after the lease is
> > expired. We have no chance to get this solved with MS so I have an
> > idea:
> >
> > Is it possible to do a Ping check befor deleting? If Ping dosenot
> work,
> > the client is deletet else renew the lease ...
> >
> > Also after updating to rc11 I still get the error:
> > Jan 30 16:22:09 anup33 dhcpd: [ID 702911 local7.error] tree.c(4069):
> > non-null pointer
> >
> > Thought this will be fixed.
> >
> > regaards
> > Tom
> >
> >
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> 
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