- Mixing DNS and DHCP Implementations
- DHCP and Static DNS Entries
- DHCP and Dynamic DNS Entries
- Dynamic Updates by the Client
- About This Article
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DHCP and Static DNS Entries
Because of the lack of support for dynamic DNS support in DHCP 2—and more significantly, perhaps, the potential management overhead if everyone could grab any name and get an IP address—many sites use fixed names for their DHCP range. In BIND 8, it's quite easy to also enter such ranges in zone files using $GENERATE. In such a case, the 16 new Penguin employee computers would be assigned an IP range, such as 192.168.55.220 to 229, and the names would be entered thus:
$GENERATE 220-229 dhcp$ A 192.168.55.$
The names would be dhcp220.penguin.bv and so forth. This is a good way to do it; it is simple and low maintenance. For hosts for which you want to have fixed IP numbers, or fixed hostnames, ISC DHCP 2 provides a way for you to assign that. In the dhcpd.conf file, insert something like this:
host gentoo {
hardware ethernet 00:60:1d:1f:1e:f7;
fixed-address 192.168.55.55;
}
This assigns the given IP address to the host bearing the given Ethernet address. Just enter the name in DNS in the usual manner. The "gentoo" part of the host statement is arbitrary, but it would be good policy to assign 192.168.55.55 the name gentoo.penguin.bv.