option82 "agent.remote-id " is missed in some lease ... Why ?

Sébastien CRAMATTE s.cramatte at wanadoo.fr
Wed Oct 25 14:56:27 UTC 2006

Thanks  for this very clear answer ...

If I understand all I must set

stash-agent-options true;

If I reset all modems does the CPE lease will be renew from relay ?
I need to this one time because more than a half connected modems don't have the "agent.remote-id" data

Glenn Satchell a écrit :
>> Date: Wed, 25 Oct 2006 11:21:54 +0200
>> From: Sébastien CRAMATTE <s.cramatte at wanadoo.fr>
>> To: dhcp-users at isc.org
>> Subject: option82 "agent.remote-id " is missed in some lease ... Why ?
>> Hi
>> I've setup cable modem + arris c3 cmts with dhcp 3.0.4
>> My cmts act as a dhcp relay and add  option82 to each  CPE leases ...
>> It's very strange because some lease have  "agent.remote-id "  line (the
>> modem mac address added by option82)  and someone  doesn't  have it ...
>> All this leases come from the CMTS relay ... so I should have 
>> agent.remote-id line for each lease  ?
>> Anyone have an idea ?
> Any broadcast requests, such as DHCPDISCOVER will be forwarded by the
> relay, but once the client has a lease it uses unicast requests direct
> to the dhcp server to renew the lease. The dhcp relay is not used with
> these, so it has no chance to add its remote id option.
> There is a setting you can add to dhcpd.conf to store the agent options
> on the lease so that they will be there for renews:
>        stash-agent-options flag;
>        If the stash-agent-options parameter is true for  a  given
>        client, the server will record the relay agent information
>        options sent during the client's initial DHCPREQUEST  mes-
>        sage when the client was in the SELECTING state and behave
>        as if those options are included in all subsequent DHCPRE-
>        QUEST  messages  sent  in the RENEWING state.   This works
>        around a problem with  relay  agent  information  options,
>        which  is that they usually not appear in DHCPREQUEST mes-
>        sages sent by the client in the  RENEWING  state,  because
>        such  messages  are unicast directly to the server and not
>        sent through a relay agent.
> regards,
> -glenn
> --
> Glenn Satchell     mailto:glenn.satchell at uniq.com.au | Some days we are
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