dhcp server issues its own address

David W. Hankins David_Hankins at isc.org
Mon Apr 16 15:52:12 UTC 2007

On Mon, Apr 16, 2007 at 04:55:18AM -0600, S Kalyanasundaram wrote:
>    Just wanted a clarification, since there is no free lease it took the abandon lease and issued. Since in the first time it is able to identify the ip is exist in the network by pinging, why cant it do in the next time. Abandon the IP again and say no free lease again. Why the reclaimed address is not followed as like other free lease, it just issued with out any check like what is done earlier?

The ICMP echo request is bypassed if the CLTT is less than 60 seconds
in the past.  The CLTT is set just above where the ping checks are
performed to the current time.

The intention I think was to avoid sending multiple ICMP packets
if we get multiple packets from a client (either due to
retransmission, or via multiple paths such as multiple relay

> Is there any time gap to reclaim the abandoned  IP address?

No.  Leases stay abandoned until they are reset by the operator,
or unless they are allocated as a last resort.

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David W. Hankins	"If you don't do it right the first time,
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Internet Systems Consortium, Inc.	-- Jack T. Hankins

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