Linux DHCP Server

Errors

interface name too long

dhcpd -t /etc/dhcp/dhcpd.conf

/etc/dhcp/dhcpd.conf: interface name too long (is 20)

dhcpd -t /etc/default/isc-dhcp-server

/etc/default/isc-dhcp-server: interface name too long (is 28)

tail -f /var/log/message

Mar 14 19:50:49 server dhcpd: No subnet declaration for eth1 (172.16.31.254).
Mar 14 19:50:49 server dhcpd: ** Ignoring requests on eth1.  If this is not what
Mar 14 19:50:49 server dhcpd:    you want, please write a subnet declaration
Mar 14 19:50:49 server dhcpd:    in your dhcpd.conf file for the network segment
Mar 14 19:50:49 server dhcpd:    to which interface eth1 is attached. **
Mar 14 19:50:49 server dhcpd: 
Mar 14 19:50:49 server dhcpd: 
Mar 14 19:50:49 server dhcpd: Not configured to listen on any interfaces!

cat /etc/network/interfaces

1. This file describes the network interfaces available on your system
2. and how to activate them. For more information, see interfaces(5).

1. The loopback network interface

auto lo iface lo inet loopback

1. WAN Interface

allow-hotplug eth0 iface eth0 inet dhcp

1. To Router Interface

auto eth1 iface eth1 inet static

       address 172.16.31.254
       netmask 255.255.255.0
       network 172.16.31.0
       broadcast 172.16.31.255

This is because the interface set for DHCP does have the subnet defined in a declaration statement in dhcp.conf