Option 82 renew/rebind problem

[Andre Schubert]

On Wed, 9 Jul 2008 07:35:30 +0200
Andre Schubert <andre at km3.de> wrote:

> Hi all,
> 
> i have a problem with dynamically assignd IPs
> and unicast renew/rebind of clients.
> 
> Iam using dhcp-3.0.1 and have the following config:
> 
> subnet 192.168.196.0 netmask 255.255.252.0 {
>     authoritative;
>     option subnet-mask 255.255.255.0;
>     option routers 192.168.199.254;
> 
>     allow unknown-clients;
> 
>     class "dynamic-known-hosts" {
>         match pick-first-value(substring (option agent.remote-id,0,6),substring (local-remote-id,0,6));
>         max-lease-time 120;
>         lease limit 1;
>         if (exists agent.remote-id) {
>             set local-remote-id = option agent.remote-id;
>         }
>         log (info,"dynamic-known-hosts");
>     }
> 
>     subclass "dynamic-known-hosts" XX:XX:XX:XX:XX:00 { lease limit 2; }
>     subclass "dynamic-known-hosts" ff:11:XX:XX:XX:01 { lease limit 3; }
>            
>     pool {
>         allow members of "dynamic-known-hosts";
>         range 192.168.199.2 192.168.199.10;
>     }
> }
> 
> I have several CPEs behind cablemodems and want to assign IPs to these CPEs using the agent.remote-id option,
> which is set by the relay-agent. If the CPEs are broadcasting their packets(DISCOVER,REQUEST) everything works perfect,
> as the relay agent forwards these packets to the dhcp-server.
> But i have seen some CPEs that send their packets directly to the dhcp-server asking to renew the lease.
> When this happens, the relay agent has no chance to add the agent information to the packets.
> I searched through the archives and found the following snipped:
> 
>         if (exists agent.remote-id) {
>             set local-remote-id = option agent.remote-id;
>         }
> 
> But doesnt seem to work. If a CPE is booted, then this CPEs will be assigned an IP and everything is perfect.
> But when this CPE starts to renew directly to the dhcp-server, then CPE got a DHCPNAK and the according lease
> state is changed from active to free.
> 
> Did i miss something ?
> Could someone point me in the right direction ?
> 

i have rebuild the whole system from scratch.
I really dont know why, but now it works perfectly.
The CPEs are going to the right class at DISCOVER, RENEW and REBIND.

Regards,
Andre Schubert
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