[CentOS] dhcpd

Hi
im trying to configure centos to run as a dhcpd daemon but it simply doesnt
work
 
I'm using the default configuration file from dhcdp (and tried multiple
alternatives).
 
problem is that pxe clients do not aquire dhcp addresses
in the log i can see that there are 3 or 4 dhcp offers  per boot atempt but
no dhcp requests
 
anyone?
 
i'm going crazy here... .i've tryed 3 diferent machines (servers) and 4 or 5
diferent clients
sometimes windows clients are able to catch the ip but only sometimes.
 
 
maybe this is a route problem?
 
the  machine(s) was freshly installed with centos 4.3
 
 
please advise!
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