openbsd_dhcp_server - nx.beandog.org

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====== OpenBSD DHCP Server ======

Configuration is very simple, direct and intuitive.  It would be easy to duplicate this setup quickly.

==== Configuration ====

Setup the main Ethernet device to reserve the first available IP address:

'' /etc/hostname.re0 ''

<code>
inet 192.168.0.2 255.255.255.0
</code>

Setup the name server resolution manually:

'' /etc/resolv.conf ''

<code>
search beandog.org
nameserver 192.168.0.2
nameserver 205.171.3.25
nameserver 205.171.2.25
</code>

Setup the server's gateway:

''/etc/mygate''

<code>
192.168.0.1
</code>

The localhost name:

''/etc/myname''

<code>
d64.beandog.org
</code>

Configure the daemons to start up on boot:

'' /etc/rc.conf.local ''

<code>
dhcpd_flags=re0
pkg_scripts="dnsmasq dbus_daemon avahi_daemon"
dnsmasq_flags=
dbus_daemon_flags=
avahi_daemon_flags=
</code>

Here's a very basic dhcpd configuration:

''/etc/dhcpd.conf''

<code>
option domain-name "beandog.org";
option domain-name-servers 192.168.0.2;
subnet 192.168.0.0 netmask 255.255.255.0 {
  option routers 192.168.0.1;
  range 192.168.0.3 192.168.0.254;
}
</code>

==== Router ====

Setting up the OpenBSD server as a router only adds a few more changes.  First of which, is to use a second NIC, and run the DHCP and DNS servers there.

Turn on network IP forwarding in ''/etc/sysctl.conf'':

<code>
net.inet.ip.forwarding=1
</code>

Setup packet filtering in ''/etc/pf.conf'':

<code>
pass out on re0 from em0:network to any nat-to (re0)
</code>

Set the second NIC's IP address manually:

<code>
inet 192.168.12.1 255.255.255.0
</code>
==== Extras ====

To preserve sanity, disable the PC speaker:

''/etc/wsconsctl.conf''

<code>
keyboard.bell.volume=0
</code>

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