lease renewal activity

[Jamie Savage]

Jim/Simon/Edward,
      Thanks for your responses.   I had not thought of the possibility of 
the ACK from the DHCP server not making it back to the client for whatever 
reason.  I'm not familiar with what the client does in this case.  Simon, 
in this situation, you've suggested the client will DHCPREQUEST more 
aggressively and then finally give up and start all over with a 
DHCPDISCOVER..........correct?

..........thx.......................J
 
Jamie Savage  |  Senior Communications Technician  |  University 
Information Technology 
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 Toronto ON  M3J 1P3 Canada 
T: 416.736.2100 x22605  |  F: 416.736.5830  |  jsavage at yorku.ca  |  
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From:   Simon Hobson <dhcp1 at thehobsons.co.uk>
To:     Users of ISC DHCP <dhcp-users at lists.isc.org>
Date:   03/29/2012 04:34 PM
Subject:        Re: lease renewal activity
Sent by:        dhcp-users-bounces+jsavage=yorku.ca at lists.isc.org



Jamie Savage wrote:

>Discover, Offer, Request Ack....life is good.  Subsequent requests 
>at the 5 minute half-life.......again...all is well......until 10:22 
>where the requests are no longer 5 minutes apart and then a discover 
>is initiated at 10.24 and then the 5 minute half-life requests start 
>again.

My guess is that <something> happened to prevent packets being 
received. So renewal at 10:14 went OK, but renewal at 10:19 (50% of 
lease used) failed. Since you say you didn't touch it, I guess you've 
no idea if any other network traffic was working.

At 10:22, about 75% of lease used, the client starts to renew more 
vigorously. Finally, at 10:24:46 (7 seconds before lease expires), 
the client gives up and broadcasts a Discover. At this point, the 
<something> that broke the network got fixed (by the act of the DHCP 
client configuring the interface ?) and the client then continued 
normally.

As to what the <something> is, no ideas !

-- 
Simon Hobson

Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.
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