isc-dhcp-server not working

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http://stackoverflow.com – First of all, sorry for my bad english. I'm trying to enable dhcp server on my debian but everytime I try to start dhcp server I get an error. This is what I get from syslog This is my /etc/dhcp/dhcpd.conf file This is my /etc/network/interfaces file So, what am I doing wrong? I am doing this through Oracle VM VirtualBox. I have two "computers" (A and B). A is connected to NAT and Internal network B is conencted to Internal network I want to boot OS from A to B. A is my server where I have DHCP, TFTPD, PXE,... Any help? Regards! (HowTos)