Assigning host entries to diffrent subnets
Simon Hobson
dhcp1 at thehobsons.co.uk
Fri Sep 28 14:50:07 UTC 2007
Try this :
Erik Bloodaxe wrote:
>Thanks for this. I have looked at the man page but need more help.
>I think you are refering to the secion from Client classing and
>subclassing in the dhcpd.conf man page. I have seen this but I
>cannot find any further information on the syntax of the match
>commnad. Can some one assist?
>
>I think you mean set up some sub classes along the lines:
>
>Subclass "subnet1" etheraddress1
>Subclass "subnet1" etheraddress2
>Subclass "subnet1" etheraddress3
>Subclass "subnet2" etheraddress4
>Subclass "subnet2" etheraddress5
>
>and so forth and catch the "subnet"s with a
>
>allow members of "sunbnet1" in appropriate pools.but again I cannot
>find the full syntax for the allow command.
>
>Can someone point me in the right direction?
From man dhcpd.conf :
>CLIENT CLASSING
> Clients can be separated into classes, and treated differently depend
> ing on what class they are in. This separation can be done either
> with a conditional statement, or with a match statement within the
> class declaration. It is possible to specify a limit on the total
> number of clients within a particular class or subclass that may hold
> leases at one time, and it is possible to specify automatic subclassing
> based on the contents of the client packet.
>
> To add clients to classes based on conditional evaluation, you can
> specify a matching expression in the class statement:
>
> class "ras-clients" {
> match if substring (option dhcp-client-identifier, 1, 3) = "RAS";
> }
>
> Note that whether you use matching expressions or add statements (or
> both) to classify clients, you must always write a class declaration
> for any class that you use. If there will be no match statement and
> no in-scope statements for a class, the declaration should look like
> this:
>
> class "ras-clients" {
> }
>
>SUBCLASSES
> In addition to classes, it is possible to declare subclasses. A sub
> class is a class with the same name as a regular class, but with a spe
> cific submatch expression which is hashed for quick matching. This is
> essentially a speed hack - the main difference between five classes
> with match expressions and one class with five subclasses is that it
> will be quicker to find the subclasses. Subclasses work as follows:
>
> class "allocation-class-1" {
> match pick-first-value (option dhcp-client-identifier, hardware);
> }
>
> class "allocation-class-2" {
> match pick-first-value (option dhcp-client-identifier, hardware);
> }
>
> subclass "allocation-class-1" 1:8:0:2b:4c:39:ad;
> subclass "allocation-class-2" 1:8:0:2b:a9:cc:e3;
> subclass "allocation-class-1" 1:0:0:c4:aa:29:44;
>
> subnet 10.0.0.0 netmask 255.255.255.0 {
> pool {
> allow members of "allocation-class-1";
> range 10.0.0.11 10.0.0.50;
> }
> pool {
> allow members of "allocation-class-2";
> range 10.0.0.51 10.0.0.100;
> }
> }
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