Where does DHCPD store its backup of the dhcpd.leases file?

[Frank Bulk]

Which CMTS are you using?  With our setup I don't recall needing any kind of
DHCPLEASEACTIVE support, and if you're looking to require that the only CPE
that can attach to your CMTS are those that obtained a dynamic from your
DHCP server or were statically assigned, the CMTS I use has other ways to
enforce that.

Frank

-----Original Message-----
From: dhcp-users-bounces at lists.isc.org
[mailto:dhcp-users-bounces at lists.isc.org] On Behalf Of Jessica Meyer
Sent: Monday, July 20, 2009 3:46 AM
To: Users of ISC DHCP
Subject: Re: Where does DHCPD store its backup of the dhcpd.leases file?

<snip>

> It won't help with users that manually configure their machine as those
> devices will never have an active lease, and I'd have thought that it
should
> be correct behaviour to NOT respond that the lease is active.

Absolutely. I'm working in a DOCSIS (cable modem) environment and for
some strange reasons the CMTS (cable modem termination system) needs a
DHCPLEASEACTIVE with the client's IP and MAC address - if there's no
such answer from DHCPD, it won't create an ARP table entry and the
customer can not surf. This is a security feature ("source-verify").
In our lab I found out that LEASEQUERY only works for the CMTS if
there is a lease in dhcpd.leases.

> Relying on the DHCP server to say a lease is active when a user
> manually configures their device seems like a recipe for
> trouble - what are you trying to do that needs it ?

Yeah, but I saw commercial products which did it exactly like that
(reverse-engineered with a network sniffer). I'm open for other
solutions, but what I need are fixed IP addresses which should act
like normal leases - and I need the client IP and MAC address in
leaseactive responses.

Jess
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