agent.remote-id problem

[Glenn Satchell]

>Date: Wed, 29 Nov 2006 14:34:54 +0100 (CET)
>Subject: agent.remote-id problem
>From: "Peter Balazs" <peter at kapos-net.hu>
>To: dhcp-server at isc.org
>
>Hi!
>
>We are an ISP through CATV network, and using ISC DHCP server (newest
>version 3.0.5).
>
>My problem is: There are such DHCPREQUEST when I can't see the extra
>message in the log, which have to occur at the "on commit" event. I read
>forums a lot, and found, that stash-agent-options is the solution for this
>problem, but it's not working for me (or just missing some other options).
>These problematic DHCPREQUEST's are came mostly from DSL routers from the
>CPE side. I'm understanding that these packets are unicasts, and this is
>why the CMTS didn't include option 82, but the DHCP SERVER should do it
>from the available lease. I checked the leases file, and the specific
>lease contains the agent.remote-id option. So, I don't have any other
>idea.
>
>Can anybody help me?
>
>Details from dhcpd.conf:
>
>**********************************
>
>log-facility local7;
>
>if (exists agent.remote-id) {
>    on commit {
>        log(info, concat("KtvAdmin: commit ", binary-to-ascii(10, 8, ".",
>leased                                             -address), " ",
>binary-to-ascii(16, 8, ":", option agent.remote-id), " ", binary
>                                          -to-ascii(10, 16, "",
>encode-int(lease-time, 16)), " ", binary-to-ascii(16, 8, "
>                                    :", substring(hardware, 1,
>6)), " '", option host-name, "'"));
>    }
>    on release {
>        log(info, concat("KtvAdmin: release ", binary-to-ascii(10, 8, ".",
>lease                                             d-address), " ",
>binary-to-ascii(16, 8, ":", substring(hardware, 1, 6))));
>    }
>    on expiry {
>        log(info, concat("KtvAdmin: expiry ", binary-to-ascii(10, 8, ".",
>leased                                             -address)));
>    }
>}
>
>
>server-identifier x.x.x.x;
>
>stash-agent-options true;
>
>ddns-update-style none;
>
>max-lease-time 21600;
>default-lease-time 21600;
>
>authoritative;
>
>shared-network kabeltv {
>
>class "client_xxxx" {
>  match if (option agent.remote-id = modem's mac address here);
>  spawn with option agent.remote-id;
>  lease limit 2;
>}
>
>pool {
>  allow members of "client_xxxx";
>  range x.x.x.x y.y.y.y;
>}
>
>}
>
>***************************************
>
>Regards,
>Balazs Peter
>
In the log statement replace this part:

binary-to-ascii(16, 8, ":", option agent.remote-id),

with something like:

pick-first-value(
	binary-to-ascii(16, 8, ":", option agent.remote-id),
	"no agent.remote-id"
),

and take out the test for (exists agent.remote-id) perhaps?

regards,
-glenn