Change DHCP-Server Address

[Bernd Nachtigall]

With the recommended option in dhcpd.conf it is running perfect :-)

But maybe they may clean up the documentation:

server-identifier hostname;

... The value specified must be an IP address  for  the
DHCP server, ...

Maybe is is more clear to write:

server-identifier IP-Address;

... The value specified must be an IP address  for  the
DHCP server, ...

Jm2c

Bernd


Am 28.06.21 um 08:50 schrieb glenn.satchell at uniq.com.au:
> 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: 10.12.251.12 Sec. IP: 10.12.251.111
>>
>> 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
>
> _______________________________________________ ISC funds the
> development of this software with paid support subscriptions. Contact
> us at https://www.isc.org/contact/ for more information.
>
> dhcp-users mailing list dhcp-users at lists.isc.org
> https://lists.isc.org/mailman/listinfo/dhcp-users