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Today's Topics:
1. Re: Curious behaviour with expired/abandoned leases not being
given out (perl-list)
2. Re: Curious behaviour with expired/abandoned leases not being
given out (Bob Harold)
----------------------------------------------------------------------
Message: 1
Date: Tue, 10 Mar 2020 10:06:35 -0400 (EDT)
From: perl-list <perl-l...@network1.net>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: Curious behaviour with expired/abandoned leases not being
given out
Message-ID:
<1177175845.833580.1583849195438.javamail.zim...@network1.net>
Content-Type: text/plain; charset=utf-8
I've seen situations where one client can continuously DHCPDECLINE every
address that is allocated essentially marking entire pools abandoned. It goes
like this:
DHCPDISCOVER
DHCPOFFER
DHCPREQUEST
DHCPACK
DHCPDECLINE
DHCPDISCOVER
DHCPOFFER
DHCPREQUEST
DHCPACK
DHCPDECLINE
DHCPDISCOVER
DHCPOFFER
DHCPREQUEST
DHCPACK
DHCPDECLINE
over and over and over again at a very rapid pace. Check your logs for this
type of behavior and remove the offending device from the network if found.
------------------------------
Message: 2
Date: Tue, 10 Mar 2020 16:56:20 -0400
From: Bob Harold <rharo...@umich.edu>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: Curious behaviour with expired/abandoned leases not being
given out
Message-ID:
<ca+nkc8bmxbxwzx_bhweusxgh1_rdm+bd+kswcidi3ge_yi8...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
On Tue, Mar 10, 2020 at 10:06 AM perl-list <perl-l...@network1.net> wrote:
> I've seen situations where one client can continuously DHCPDECLINE every
> address that is allocated essentially marking entire pools abandoned. It
> goes like this:
>
> DHCPDISCOVER
> DHCPOFFER
> DHCPREQUEST
> DHCPACK
> DHCPDECLINE
>
> DHCPDISCOVER
> DHCPOFFER
> DHCPREQUEST
> DHCPACK
> DHCPDECLINE
>
> DHCPDISCOVER
> DHCPOFFER
> DHCPREQUEST
> DHCPACK
> DHCPDECLINE
>
> over and over and over again at a very rapid pace. Check your logs for
> this type of behavior and remove the offending device from the network if
> found.
>
>
I have also seen this, and if memory serves me, the lease file will show
'state' as "5" for the declined IP's.
--
Bob Harold
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