Send dhcp-users mailing list submissions to dhcp-users@lists.isc.org
To subscribe or unsubscribe via the World Wide Web, visit https://lists.isc.org/mailman/listinfo/dhcp-users or, via email, send a message with subject or body 'help' to dhcp-users-requ...@lists.isc.org You can reach the person managing the list at dhcp-users-ow...@lists.isc.org When replying, please edit your Subject line so it is more specific than "Re: Contents of dhcp-users digest..." 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 -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://lists.isc.org/pipermail/dhcp-users/attachments/20200310/c95d38ce/attachment-0001.htm> ------------------------------ Subject: Digest Footer _______________________________________________ dhcp-users mailing list dhcp-users@lists.isc.org https://lists.isc.org/mailman/listinfo/dhcp-users ------------------------------ End of dhcp-users Digest, Vol 137, Issue 2 ******************************************