Configuring the DHCP Service Give out IPs using ISC-DHCP 3.0.3 (FreeBSD 5.4) |
Posted 30.06.2005 | Updated 23.05.2006 | Contributed by Andy Mallett & Nick Fratangelo
InstallationPerform a standard installation..tar -zxvf dhcp-3.0.3.tar.gz cd dhcp-3.0.3 ./configure make make install ConfigurationCreate the following files..touch /var/db/dhcpd.leases cp /src/dhcp-3.0.3/server/dhcpd.conf /etc vi /etc/dhcpd.conf Here's an example dhcpd.conf file..
# Andy's dhcpd.conf
default-lease-time 600;
max-lease-time 7200;
ddns-update-style ad-hoc;
# option definitions common to all supported networks..
subnet 192.168.0.0 netmask 255.255.255.0 {
range 192.168.0.50 192.168.0.90;
option routers 192.168.0.101;
option domain-name-servers 192.168.0.101;
option domain-name "domain.net";
}
# 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;
#Example reserved IP..
host wireless1.domain.net {
hardware ethernet 00:04:23:21:51:50;
fixed-address 192.168.0.100;
}
The above config file will give out IPs from 192.168.0.50 to 192.168.0.90 with a default Class C Subnet Mask of 255.255.255.0. I prefer to express the DNS Server and Gateway as IP Addresses rather than host names. Additionally an example of a reserved IP Address is shown, which would lock the specified IP to the specified MAC Address. Add a 4-5 line entry like this, per reserved IP. Starting the DHCP serviceThe dhcpd daemon lives in /usr/sbin/dhcpd, which is in the system path. So to start the service, simply type:dhcpd Any configuration errors will be displayed - fix them before you can start the service. Success can be seen with a running dhcpd process.. ps -aux | grep dhcpd root 1548 0.0 0.5 420 264 p0 D+ 11:08AM 0:00.00 grep dhcpdTo view the DHCP leases, type: more /var/db/dhcpd.leases This file can be edited to remove previous leases and will regenerate parts of itself when a lease is given out. Finally, to run the daemon from startup we put an entry line into rc.local.. vi /etc/rc.local
/usr/sbin/dhcpd
Related Linkshttp://ezine.daemonnews.org/200207/dhcp.htmlhttp://www.isc.org/products/DHCP http://www.onlamp.com/pub/a/bsd/2003/05/01/FreeBSD_Basics.html DHCP Service TweaksSince installing ISC-DHCP we have added a few modifications to the service- Make the DHCP Service log to its own file - DHCP Service sends an administrative email if new system joins.. - DHCP Service sends an administrative SMS if new system joins.. - Extending DHCP to include TFTP and PXE services - A/N.
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