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

[Sébastien CRAMATTE]

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 ?

Regards

Sebastien