Class matching based on client host name
Simon Hobson
dhcp1 at thehobsons.co.uk
Thu May 15 14:49:59 UTC 2008
Mcwilliams, Rhys \(ADP DSI\) wrote:
>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...
You haven't posted the whole config file, so we have to guess at what
else you have included or omitted !
Do you have separate subnets (ie 10.10.10.0/24 & 10.10.11.0/24), one
larger one (eg 10.10.10.0/23), or soemthing totally different ?
If you have separate subnets, have you included them in a
shared-subnet declaration ?
Is anything at all logged ?
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