SV: lease limits, classes & subclasses
G. Coles
gilbertx07 at hotmail.com
Sun Mar 18 16:38:48 UTC 2007
Hello Lars,
first of all thanks for your reply - very helpful indeed and you gave me new
insights to try out :) Yes you assumed right the RID is a normal MAC
address.
Meanwhile I was trying out some things & what I assumed before I started is
that dhcpd parses the conf file sequentially - so i thought... if I defined
the classes of those special (but few) RIDs for which I want multiple lease
limits first then define a normal class that limits all the rest with lease
limit 1 then I should work.
so i went about defining the classes as follows:
class "limited-to-2-lease" {
match if substring (option agent.remote-id , 0, 17);
lease limit 2;
}
subclass "limited-to-1-lease" "XX:XX:XX:XX:XX:XX";
subclass "limited-to-1-lease" "YY:YY:YY:YY:YY:YY";
class "limited-to-1-lease" {
spawn with option agent.remote-id
lease limit 1;
}
In fact when I tested it out dhcpd parses conf file sequentially so it
worked for me
What do you think? is there some caveat somewhere for which I should
consider defining each and every RID for which I want a lease limit of 1 or
does my method always work?
What I'm trying to do, I'm sure you noticed this, is that I'm trying to
avoid defining each and every RID which I want to have a lease limit 1
because of the huge number (thousands) of MACs that will need to be listed
here.
Thanks for your link too Lars - extremely helpful
GC
>From: "Lars Jacobsen" <lars-jacobsen at newmail.dk>
>Reply-To: dhcp-users at isc.org
>To: <dhcp-users at isc.org>
>Subject: SV: lease limits, classes & subclasses
>Date: Thu, 15 Mar 2007 20:55:41 +0100
>
> > G. Coles wrote:
> >
> > what i'm trying to do (hopefully this can be done) is to classify dhcp
> > clients into 2 types: example:
> > 1st type: takes 'lease limit 1;'
> > 2nd type: takes 'lease limit 4;'
> >
> > now the only thing I can use in my scenario to classify clients is the
> > option agent.remote-id
> >
>
>Ok how is the struckture af the RID ?
>To me it looks like you are using MAC addresses.
>
>If they are all random then I guess you have to add them one by one,
>something like this:
>
>
>class "limmited-to-1-lease" {
> match if substring (option agent.remote-id , 0, 17);
> lease limit 1;
> }
> subclass "limmited-to-1-lease" "XX:XX:XX:XX:XX:XX;
> subclass "limmited-to-1-lease" "YY:YY:YY:YY:YY:YY";
>
>
>class "limmited-to-2-lease" {
> match if substring (option agent.remote-id , 0, 17);
> lease limit 2;
> }
> subclass "limmited-to-2-lease" "ZZ:ZZ:ZZ:ZZ:ZZ:ZZ;
>
>
>class "limmited-to-4-lease" {
> match if substring (option agent.remote-id , 0, 17);
> lease limit 4;
> }
> subclass "limmited-to-4-lease" "AA:AA:AA:AA:AA:AA;
> subclass "limmited-to-4-lease" "BB:BB:BB:BB:BB:BB;
> subclass "limmited-to-4-lease" "CC:CC:CC:CC:CC:CC;
>
>
>
>Othervice if all the RID´s have something in common like the first 3 bytes
>you can do a match on just that part instead of the whole RID to match a
>class and then use spawning to make a unique class for each RID.
>
>
>class "XX:XX:XX" {
>match if substring ( (option agent.remote-id) , 0,8)= "XX:XX:XX";
>spawn with option agent.remote-id;
>lease limit 4;
>}
>
>
>class "ZZ:ZZ:ZZ:01-to-ZZ:ZZ:ZZ:02" {
>match if substring ( (option agent.remote-id) , 0,8)= "ZZ:ZZ:ZZ" AND
>(substring ( (option agent.remote-id) , 8,2)= "01" OR
>substring ( (option agent.remote-id) , 8,2)= "02");
>spawn with option agent.remote-id;
>lease limit 1;
>}
>
>
>class "AA:BB:CC:01-to-AA:BB:CC:04" {
>match if substring ( (option agent.remote-id) , 0,8)= "AA:BB:CC" AND
>(substring ( (option agent.remote-id) , 8,2)= "01" OR
>substring ( (option agent.remote-id) , 8,2)= "02"
>substring ( (option agent.remote-id) , 8,2)= "03"
>substring ( (option agent.remote-id) , 8,2)= "04");
>spawn with option agent.remote-id;
>lease limit 2;
>}
>
>
>
>I made a little description on my own problems and how I solved them.
>You can find it here:
>www.strammelse.dk/dhcp
>
>
>Regards
>
>/Lars
>
>
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