Re: dhcp-users Digest, Vol 61, Issue 20
Julie Xu
xll40 at hotmail.com
Tue Nov 19 09:59:15 UTC 2013
Sent from Windows Mail
----------------------------------------------------------------------
Steve
the client is in dynamic pool, so host statement can not be use, am I right?
if so, the only thing I can change is change that class “windownRIS”, am I right?
can I use other option to help select the server-identifier, for example, can I use relay agent ip address? because the relay agent will be always the 10.1.1.1?
please advice
julie
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Message: 5
Date: Tue, 19 Nov 2013 08:55:24 +0000
From: Steven Carr <sjcarr at gmail.com>
To: Users of ISC DHCP <dhcp-users at lists.isc.org>
Subject: Re: How can I overwrite global RIS server indecater
Message-ID:
<CALMep05kM=u-UqaFbwDF-cKcqfUCz_8AOCnM5A1kwG40WnJtMA at mail.gmail.com>
Content-Type: text/plain; charset=UTF-8
On 19 November 2013 07:46, Julie Xu <xll40 at hotmail.com> wrote:
>
> at global, I have configure:
>
>
> class "windowRIS" {
>
> match if substring( option vendor-class-identifier, 0, 9 ) =
> "PXEClient";
>
> option vendor-class-identifier "PXEClient";
>
> server-identifier 10.10.10.2;
>
> }
>
>
> now on one subnet I want the server as 10.1.1.3
> I have done:
> subnet 10.1.1.0 netmask 255.255.254.0 {
> option broadcast-address 10.1.2.255;
> option routers 10.1.1.1;
> pool {
> failover ?failover?
> server-identifier 10.1.1.3;
> deny dynamic bootp clients;
> range 10.1.1.20 10.1.2.254;
> }
> but, the client still insist to use 10.10.10.2, what I did wrong?
The order is host, class, pool, subnet, shared-network.
http://manpages.ubuntu.com/manpages/trusty/man5/dhcpd.conf.5.html
"When a client is to be booted, its boot parameters are determined by
consulting that client's host declaration (if any), and then consulting
any class declarations matching the client, followed by the pool,
subnet and shared-network declarations for the IP address assigned to
the client. Each of these declarations itself appears within a
lexical scope, and all declarations at less specific lexical scopes are
also consulted for client option declarations. Scopes are never
considered twice, and if parameters are declared in more than one
scope, the parameter declared in the most specific scope is the one
that is used."
So in your case "class" is more specific than "subnet", so class will
win, you can't override for the subnet. If you want to override then
it would need to be in a host declaration.
Steve
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End of dhcp-users Digest, Vol 61, Issue 20
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