Experiences With Open Source

# dhcpd.conf # # Sample configuration file for ISC dhcpd #

# option definitions common to all supported networks… option
domain-name “example.org”; option domain-name-servers ns1.exam-
ple.org, ns2.example.org;

default-lease-time 600; max-lease-time 7200;

# If this DHCP server is the official DHCP server for the local #
network, the authoritative directive should be uncommented. #au-
thoritative;

# Use this to send dhcp log messages to a different log file (you
also # have to hack syslog.conf to complete the redirection).
log-facility local7;

# No service will be given on this subnet, but declaring it helps
the # DHCP server to understand the network topology.

subnet 10.152.187.0 netmask 255.255.255.0 { }

# This is a very basic subnet declaration.

subnet 10.254.239.0 netmask 255.255.255.224 {
range 10.254.239.10 10.254.239.20;
option routers rtr-239-0-1.example.org, rtr-239-0-2.exam-
ple.org; }

# This declaration allows BOOTP clients to get dynamic addresses,
# which we don’t really recommend.

subnet 10.254.239.32 netmask 255.255.255.224 {
range dynamic-bootp 10.254.239.40 10.254.239.60;
option broadcast-address 10.254.239.31;
option routers rtr-239-32-1.example.org; }

# A slightly different configuration for an internal subnet.
subnet 10.5.5.0 netmask 255.255.255.224 {
range 10.5.5.26 10.5.5.30;
option domain-name-servers ns1.internal.example.org;
option domain-name “internal.example.org”;
option routers 10.5.5.1;
option broadcast-address 10.5.5.31;
default-lease-time 600;
max-lease-time 7200; }

# Hosts which require special configuration options can be listed in
# host statements. If no address is specified, the address will be
# allocated dynamically (if possible), but the host-spe-cific information
# will still come from the host declaration.

host passacaglia {
hardware ethernet 0:0:c0:5d:bd:95;
filename “vmunix.passacaglia”;
server-name “toccata.fugue.com”; }

# Fixed IP addresses can also be specified for hosts. These ad-
dresses # should not also be listed as being available for dynam-
ic assignment. # Hosts for which fixed IP addresses have been
specified can boot using # BOOTP or DHCP. Hosts for which no
fixed address is specified can only # be booted with DHCP, unless
there is an address range on the subnet # to which a BOOTP client
is connected which has the dynamic-bootp flag # set. host fanta-
sia {
hardware ethernet 08:00:07:26:c0:a5;
fixed-address fantasia.fugue.com; }

# You can declare a class of clients and then do address alloca-tion
# based on that. The example below shows a case where all clients
# in a certain class get addresses on the 10.17.224/24 subnet, and all
# other clients get addresses on the 10.0.29/24 subnet.

class “foo” {
match if substring (option vendor-class-identifier, 0, 4) =
“SUNW”; }

shared-network 224-29 {
subnet 10.17.224.0 netmask 255.255.255.0 {
option routers rtr-224.example.org;
}
subnet 10.0.29.0 netmask 255.255.255.0 {
option routers rtr-29.example.org;
}
pool {
allow members of “foo”;
range 10.17.224.10 10.17.224.250;
}
}