Has an address record but no DHCID, not mine.

Bill Shirley bill at c3po.polymerindustries.biz
Tue Sep 5 12:38:08 UTC 2017


Before updating the DNS, DHCP checks that there is no existing record for that
hostname or, if there there is a record, that its TXT (or DHCID) matches the value
it calculates for the MAC address.  If it finds a record and there is a mis-match,
it issues the 'not mine' message when actually is DHCP's but not for that MAC
address.

Add a host record for one of the two MACs setting the ddns-hostname to use:
host Bobs-Wifi  { hardware ethernet f0:bf:97:13:7f:f8;          ddns-hostname = "Bobs-Wifi"; }

This should stop the conflict.

Bill

On 9/5/2017 2:45 AM, thomas.zenz at oenb.at wrote:
> Hi Bill,
>
> Yes the mac is different:
> Sep  4 10:29:52 anlpn35 dhcpd: DHCPREQUEST for 172.20.17.22 from
> f8:0b:cb:4f:db:dc (PC7345) via 212.39.196.110
> Sep  4 10:29:52 anlpn35 dhcpd: DHCPACK on 172.20.17.22 to f8:0b:cb:4f:db:dc
> (PC7345) via 212.39.196.110
> Sep  4 10:50:41 anlpn35 dhcpd: DHCPREQUEST for 10.101.90.45 from
> d4:81:d7:77:15:16 via enp6s0
> Sep  4 10:50:41 anlpn35 dhcpd: DHCPACK on 10.101.90.45 to d4:81:d7:77:15:16
> via enp6s0
>
> The difference is, the 172.20 Address is for a Cisco AnyConnect Client.
> Actually Requested by the Firewall with a different UID for each Session.
> MAC for all sessions is the same.
> Nevertheless anlpn35 added the A Record for 172.20.17.22 why does it say
> DHCID not mine??
>
> Tom
>
>
>
> --
> Sent from: http://isc-dhcp-users.2343191.n4.nabble.com/
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