Recipe 24.5. Adding Static Hosts to dhcp
24.5.1 Problem
You have some servers or other machines to
which you want to assign static IP addresses. You can use
/etc/hosts, but it's a bit of
bother to edit /etc/hosts on each of the zillion
PCs you're responsible for. Can you do it in
dhcpd.conf?
24.5.2 Solution
Yes, you surely can.
You'll need the MAC address of your network card,
which you can find with ifconfig:
$ /sbin/ifconfig
eth0 Link encap:Ethernet HWaddr 00:03:6D:00:83:CF
inet addr:192.168.1.5 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
.....
You want the HWaddr value.
On Windows 95/98/ME, open a DOS prompt and run
winipcfg.
On NT/2000/XP, run
ipconfig.
Make an entry in dhcpd.conf like this:
host mail1 {
hardware ethernet 00:03:6D:00:83:CF;
fixed-address 192.168.1.100;
}
Note that multiple-line directives must be enclosed in curly braces.
Name servers have their own directive in
dhcpd.conf, so they don't need
MAC addresses:
option domain-name-servers 192.168.1.10, 192.168.1.11
That's all there is to it. Use this for any machine
you wish to have a static IP address.
24.5.3 Discussion
You can still use /etc/hosts for important
servers, as a fallback for local users. Remember, with
/etc/hosts the network does not break when a
single server goes down.
Every network card ever made has a unique 48-bit Media Access Control
(MAC address). The Institute of
Electrical and Electronics Engineers, Inc. (IEEE) assigns the first
24 bits, then the manufacturer assigns the remaining 24 bits.
24.5.4 See Also
| 
