bind
) is the main author of the DHCP server. The matching Debian package is isc-dhcp-server.
/etc/dhcp/dhcpd.conf
, and /etc/dhcp/dhcpd6.conf
for IPv6) are the domain name and the DNS servers. If this server is alone on the local network (as defined by the broadcast propagation), the authoritative
directive must also be enabled (or uncommented). One also needs to create a subnet
section describing the local network and the configuration information to be provided. The following example fits a 192.168.0.0/24
local network with a router at 192.168.0.1
serving as the gateway. Available IP addresses are in the range 192.168.0.128
to 192.168.0.254
.
Example 10.15. Excerpt of /etc/dhcp/dhcpd.conf
# # Sample configuration file for ISC dhcpd for Debian # # The ddns-updates-style parameter controls whether or not the server will # attempt to do a DNS update when a lease is confirmed. We default to the # behavior of the version 2 packages ('none', since DHCP v2 didn't # have support for DDNS.) ddns-update-style interim; # option definitions common to all supported networks... option domain-name "internal.falcot.com"; option domain-name-servers ns.internal.falcot.com; 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. authoritative; # 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; # My subnet subnet 192.168.0.0 netmask 255.255.255.0 { option routers 192.168.0.1; option broadcast-address 192.168.0.255; range 192.168.0.128 192.168.0.254; ddns-domainname "internal.falcot.com"; }
machine-192-168-0-131.internal.falcot.com
). Using this feature requires configuring the DNS server to accept updates to the internal.falcot.com
DNS zone from the DHCP server, and configuring the latter to submit updates for each registration.
bind
case (see Section 10.7.1, “DNS software”), the allow-update
directive needs to be added to each of the zones that the DHCP server is to edit (the one for the internal.falcot.com
domain, and the reverse zone). This directive lists the IP addresses allowed to perform these updates; it should therefore contain the possible addresses of the DHCP server (both the local address and the public address, if appropriate).
allow-update { 127.0.0.1 192.168.0.1 212.94.201.10 !any };
bind
, and the latter will overwrite its configuration files at regular intervals. Since this automated procedure produces files that are less human-readable than manually-written ones, the Falcot administrators handle the internal.falcot.com
domain with a delegated DNS server; this means the falcot.com
zone file stays firmly under their manual control.
ddns-update-style interim;
and ddns-domain-name "internal.falcot.com";
lines.