dhcpd leases: abandonded

Jeff Stettenbenz jeff.stettenbenz at cinergymetronet.com
Fri Apr 30 18:27:54 UTC 2010


Thanks for your reply. 
I have checked my abandoned leases for activity and there are none. 
I have an abundance of free IP addresses in every block. 

I find it interesting the manual says it will only use abandoned IP's once the free addresses are exhausted, yet as you can see here - two minutes after the IP was abandoned, it was offered to a new client. 

So, I am interested to know if anyone has used 'deny declines;' and what was the behavior of the client. 
Also, is it possible to increase the amount of time that an IP is marked abandoned before it is supposed to be used?

-----Original Message-----
From: Jeff Stettenbenz 
Sent: Wednesday, April 28, 2010 5:10 PM
To: 'dhcp-users at lists.isc.org'
Subject: dhcpd leases: abandonded 

I have an issue where:

-client A declines its lease
-client A discovers for a new IP 
-dhcpd marks client A's lease as abandoned
-client A request/offer/ACK's
-client B dhcpdiscover
-dhcpd offers client A's IP address
-client B starts a 4 hour DHCPDISCOVER/DHCPOFFER loop


Is there a way to increase the amount of time that an abandoned IP address is set as "abandoned"? 
Should 'deny declines;' be used in this case?

Apr 28 05:11:40 -dhcp-01 dhcpd: DHCPACK on 192.168.194.20 to 00:00:00:aa:bb:cc via 192.168.194.1
Apr 28 05:11:41 -dhcp-01 dhcpd: Abandoning IP address 192.168.194.20: declined.
Apr 28 05:11:41 -dhcp-01 dhcpd: DHCPDECLINE of 192.168.194.20 from 00:00:00:aa:bb:cc via 192.168.194.1: not found
Apr 28 05:11:51 -dhcp-01 dhcpd: DHCPDISCOVER from 00:00:00:aa:bb:ccvia 192.168.194.1
Apr 28 05:11:52 -dhcp-01 dhcpd: DHCPOFFER on 192.168.194.30 to 00:00:00:aa:bb:cc via 192.168.194.1
Apr 28 05:11:52 -dhcp-01 dhcpd: DHCPREQUEST for 192.168.194.30 from 00:00:00:aa:bb:cc via 192.168.194.1
Apr 28 05:11:52 -dhcp-01 dhcpd: DHCPACK on 192.168.194.30 to 00:00:00:aa:bb:cc via 192.168.194.1
Apr 28 05:13:42 -dhcp-01 dhcpd: Reclaiming abandoned IP address 192.168.194.20.
Apr 28 05:13:42 -dhcp-01 dhcpd: DHCPDISCOVER from 00:00:00:zz:yy:xx  via 192.168.194.1
Apr 28 05:13:43 -dhcp-01 dhcpd: DHCPOFFER on 192.168.194.20 to 00:00:00:zz:yy:xx  via 192.168.194.1
Apr 28 05:13:43 -dhcp-01 dhcpd: DHCPDISCOVER from 00:00:00:zz:yy:xx  via 192.168.194.1
Apr 28 05:13:43 -dhcp-01 dhcpd: DHCPOFFER on 192.168.194.20 to 00:00:00:zz:yy:xx  via 192.168.194.1
Apr 28 05:13:45 -dhcp-01 dhcpd: DHCPDISCOVER from 00:00:00:zz:yy:xx  via 192.168.194.1

. 
.
Apr 28 09:39:18 metronet-dhcp-01 dhcpd: DHCPDISCOVER from 00:00:00:zz:yy:xx  via 192.168.194.1
Apr 28 09:39:19 metronet-dhcp-01 dhcpd: DHCPOFFER on 192.168.194.20  to 00:00:00:zz:yy:xx  via 192.168.194.1
Apr 28 09:39:20 metronet-dhcp-01 dhcpd: DHCPREQUEST for 192.168.194.20  from 00:00:00:zz:yy:xx  via 192.168.194.1
Apr 28 09:39:20 metronet-dhcp-01 dhcpd: DHCPACK on 192.168.194.20  to 00:00:00:zz:yy:xx  via 192.168.194.1




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