a single subnet that is failing

[Simon Hobson]

Remzi AKYUZ wrote:

>if your you dont have any interface on 10.4.51.0/24,
>dhcpd could not serv for 10.4.51.0/24.

That is WRONG

DHCP works fine over a WAN, all it requires is helper agents (aka 
BOOTP relay agent, aka DHCP relay agent) somewhere on each network 
that is not directly attached to the server. The OP did state that 
there were agents in place, and the log shows that the request was 
received via an agent.