Class matching based on client host name

[Mcwilliams, Rhys (ADP DSI)]

Hi all,
 
Apologies if this has been asked & answered but I've spent the last few
hours searching through the archives to no avail...
 
Scenario: I have 2 branches each with its own default gateway, DNS
servers etc... (lets call then "br1" & "br2")
The Windows machine names are all prefixed with the branch name (e.g.
br1-john or br2-peter). The users regularly travel between the branches.
The dhcpd.conf will specify a "fixed-address" for each client of their
specific branch based on MAC (this is all up and running already).
 
What I'm trying to achieve is a class match based on the first 4
characters of the users Windows machine name
something like the following
# branch 2 DHCP server
      class "br1-clients" {
                match if (
                  (substring(option host-name,0,4) = "br1-") or
                  (substring(option host-name,0,4) = "BR1-"));
        }
 
# branch 1 DHCP server
      class "br2-clients" {
                match if (
                  (substring(option host-name,0,4) = "br2-") or
                  (substring(option host-name,0,4) = "BR2-"));
        }
 
Then I need a pool on each to assign from based on the class
something like the following
# branch 2 DHCP server (plus all the other usual options like "option
routers" etc local to each site)
     pool {
                        allow members of "br1-clients";
                        allow known-clients;
                        max-lease-time 86400;
                        default-lease-time 43200;
                        range 10.10.10.1 10.10.10.61;
     }
 
# branch 1 DHCP server (plus all the other usual options like "option
routers" etc local to each site)
     pool {
                        allow members of "br2-clients";
                        allow known-clients;
                        max-lease-time 86400;
                        default-lease-time 43200;
                        range 10.10.11.1 10.10.11.61;
     }
 
So what should happen then is that if a user from br1 visits br2 - the
machine name starts with "br1-" and is therefore assigned an IP out of
the 10.10.10 pool.
 
There seems to be a problem with this attempted config as my test
machines are not getting assigned IP's from the pool - it doesn't even
show anything in the log file while one of the machines is trying for an
IP. I'm guessing that my problem lies with the "(substring(option
host-name,0,4) = "br1-")". I'm using that because I found such an
example on the net (it didn't stat whether it work though...) and I
can't find any other option...
 
This is not critical but certainly would make life a whole lot easier if
it is possible as I'd also like to assign such pools for machines in the
workshop being repaired/setup...

Regards
---------------------------------------------
Rhys McWilliams


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