Assigning host entries to diffrent subnets
Erik Bloodaxe
E.Bloodaxe at gold.ac.uk
Mon Oct 1 15:57:51 UTC 2007
Thanks again; however; I am missing something here.
I have cut down my dhcpd.conf to:
host pxe-client8 { hardware ethernet 00:07:e9:c8:14:7b ;}
host xxx { hardware ethernet 00:04:75:97:fc:8c ; }
class "pxe-clients" {
match pick-first-value (hardware);
#match pick-first-value (option dhcp-client-identifier, hardware);
}
class "gold-portables" {
}
subclass "pxe-clients" 00:07:e9:c8:14:7b ;
subclass "pxe-clients" 00:04:75:97:fc:8c ;
subclass "pxe-clients" "pxe-client8";
subclass "pxe-clients" "xxx";
# ISC dhcpd config file
#
# Log to a dedicated log file
#log-facility local5;
#
authoritative;
shared-network goldall {
subnet 192.168.129.0 netmask 255.255.255.0 {
default-lease-time 28800;
max-lease-time 28800;
option domain-name-servers 192.168.129.3;
pool {
range 192.168.129.10 192.168.129.250;
deny unknown clients;
}
}
subnet 192.168.64.0 netmask 255.255.255.0 {
pool {
range 192.168.64.2 192.168.64.254;
deny unknown clients;
allow members of "pxe-clients";
}
}
}
but my hosts with the mac addresses in the config file keep getting 129
range addresses.
So I am not associating the mac addresses with the class correclty?
Reading the man pages dor dhcpd, dhcp-options, and dhcp-eval I cannot
figure out how to do this
Can some one please assist.
Also a 2nd qustion. When I have 2 pools that the client matches which
one does the IP address get assigned from?
regards
Rob
Simon Hobson wrote:
> 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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