Unknown clients allowed, no response to discovers

[Ryan Goddard]

DHCP server V3.0.1rc12
Requests from some CPEs (soho routers) attached to cable modems are showing
in the log as "unknown clients" - while in the dhcpd.conf unknown clients
are allowed for these subnets.
What could be causing the server to respond to these discovers like this?

ex:
May 19 15:19:16 server02 dhcpd: [ID 702911 local5.info] DHCPDISCOVER from
f8:32:e4:ae:33:10 via 66.207.2.1: unknown client

}
subnet 66.207.2.0 netmask 255.255.255.0 {
option broadcast-address 66.207.2.255;
option routers 66.207.2.1;
range 66.207.2.2 66.207.2.253;
}


Seems to be impacting only the ranges in this particular scope.
Any insight appreciated.
thanks
Ryan
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