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Today's Topics:
1. Change DHCP-Server Address (Bernd Nachtigall)
2. Re: Change DHCP-Server Address (glenn.satch...@uniq.com.au)
3. Re: Change DHCP-Server Address (Bernd Nachtigall)
----------------------------------------------------------------------
Message: 1
Date: Mon, 28 Jun 2021 08:31:53 +0200
From: Bernd Nachtigall <bna...@web.de>
To: dhcp-users@lists.isc.org
Subject: Change DHCP-Server Address
Message-ID: <1498c6a1-cdee-8965-6a98-3d9767556...@web.de>
Content-Type: text/plain; charset=utf-8; format=flowed
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 anwers 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
------------------------------
Message: 2
Date: Mon, 28 Jun 2021 16:50:05 +1000
From: glenn.satch...@uniq.com.au
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: Change DHCP-Server Address
Message-ID: <24f1479ce7338926c392f450357a1...@uniq.com.au>
Content-Type: text/plain; charset=US-ASCII; format=flowed
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
------------------------------
Message: 3
Date: Mon, 28 Jun 2021 09:02:22 +0200
From: Bernd Nachtigall <bna...@web.de>
To: dhcp-users@lists.isc.org
Subject: Re: Change DHCP-Server Address
Message-ID: <a1c76302-13ff-7dae-3eaf-71b7bcc9b...@web.de>
Content-Type: text/plain; charset=utf-8; format=flowed
Hi Glenn,
read's good :-)
I does not found this because the "hostname"
Will try this.
Bernd
Am 28.06.21 um 08:50 schrieb glenn.satch...@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
>
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