Aw: Re: Re: ISC dhcp assigns ip addresses outside dynamic range

perl-list perl-list at
Fri Jul 6 18:02:08 UTC 2018

In my experience, when an IP has been assigned by 'fixed-address' inside a host statement (OMAPI or dhcpd.conf) it does NOT keep a lease for it in dhcpd.leases. It does NOT inform the failover peer. If you attempt to release such address, the DHCP server will log that the lease is not found. 

Thats what is telling me that this was handed out dynamically. Thats why i wondered about restarting after config change. Its like one of them has it included in the range and the other does not hence why it is saying "unknown IP address". 

> From: "Frank Ulherr" <dhcp at>
> To: "Users of ISC DHCP" <dhcp-users at>
> Sent: Friday, July 6, 2018 1:21:27 PM
> Subject: Re: Aw: Re: Re: ISC dhcp assigns ip addresses outside dynamic range

> Hi!

> Am 06.07.2018 um 15:22 schrieb perl-list < [ mailto:perl-list at |
> perl-list at ] >:

>> I realize that this is possible, but it won't be passed to the failover peer in
>> such a case. You have to use OMAPI to add it to both servers. It seems that
>> this lease was handed out dynamically due to the log line about difficulty
>> passing it to the failover peer.

> The primary dhcp hands out an ip address, which is not in its dynamic range.
> Then it sends this information to the secondary dhcp, which complains.
> That is weird, because that is one of the primary purpose of a dhcp: Hand out
> ips correctly.

>> ' Jul 5 13:14:35 a-rl-dhcp1 dhcpd[20145]: bind update on from
>> dhcp-failover rejected: unknown IP address'

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