Change DHCP-Server Address

Bernd Nachtigall bnacht at
Mon Jun 28 07:02:22 UTC 2021

Hi Glenn,

read's good :-)
I does not found this because the "hostname"

Will try this.


Am 28.06.21 um 08:50 schrieb glenn.satchell at
> On 2021-06-28 16:31, Bernd Nachtigall wrote:
>> Hi,
>> there is a DHCP-Service which is configured to use a secondary
>> IP-Address. This runs fine.
>> Main IP:
>> Sec. IP:
>> But when check the answers from the service at a client it seems that the
>> service use the main IP as sender. Is there a way to configure the dhcpd
>> that it uses the sec. IP-Addr. as 'from' when answering to clients?
>> Bernd
> Hi Bernd
> Looks like you need to use the server-identifier statement. This is from
> the dhcpd.conf man page:
> The server-identifier statement
> server-identifier hostname;
> The server-identifier statement can be used to define the value that is
> sent in the DHCP Server Identifier option for a given scope.  The value
> specified must be an IP address  for  the  DHCP server, and must be
> reachable by all clients served by a particular scope.
> The  use  of  the  server-identifier  statement is not recommended - the
> only reason to use it is to force a value other than the default value
> to be sent on occasions where the default value would be incorrect.  The
> default value is the first IP address associated with the physical
> network interface on which the request arrived.
> The usual case where the server-identifier statement needs to be sent is
> when a physical interface has more than one IP address, and the one
> being sent by default isn't appropriate  for  some or  all  clients
> served  by that interface.  Another common case is when an alias is
> defined for the purpose of having a consistent IP address for the DHCP
> server, and it is desired that the clients use this IP address when
> contacting the server.
> Supplying a value for the dhcp-server-identifier option is equivalent to
> using the server-identifier statement.
> regards,
> Glenn
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