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Assigning Fixed Addresses
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DHCP allows you to assign fixed IP addresses and hostnames for certain machines. All you need to use is the host declaration statement, which has the following syntax: host given_hostname {
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CHAPTER 11 NETWORK SERVICES
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hardware ethernet target_MAC_address; fixed-address target_IP_address; } where given_hostname is the hostname you want to assign for the machine, given_MAC_address is the MAC address of the target machine, and target_IP_address is the IP address that you want to give for that machine. You can get the IP address and MAC address of a Linux computer using the ifconfig command. Assuming that you want to assign 192.168.1.4 as buko for the client that has the MAC address of 00:16:3E:6B:BC:16 and 192.168.1.5 as saging for the client with the MAC address 00:16:3E:3F:2D:BF, you will use the host declaration statements shown in Listing 11-3. Listing 11-3. The Host Declaration Statements for the Target Machines host buko { hardware ethernet 00:16:3E:6B:BC:16; fixed-address 192.168.1.4; } host saging { hardware ethernet 00:16:3E:3F:2D:BF; fixed-address 192.168.1.5; } Any time those machines with the given MAC addresses load, they will be assigned their hostnames and IP addresses. Make sure that the additional host declaration statements that you will make do not contain IP addresses that will conflict with any subnet range in the configuration file, or DHCP will become confused and will not run.
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Note: Subnet declaration statements are for dynamically assigned IP addresses, while host declarations are for
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statically assigned IP addresses.
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Organizing with Groups
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Later, when your configuration file grows because of additional machines and fixed IP addresses, you need to have a way to organize the statements. Fortunately, there is a declaration statement just for that purpose, called the group declaration. The group declaration has the following syntax group { parameter_statements; declaration_statements { parameter_statements; } } You can enclose parameter statements and declaration statements in a group declaration statement. There can be more than one group statement in the configuration file, and you can nest them if required. For example, suppose a new router with the IP address 192.168.1.20 and two new domain name servers
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CHAPTER 11 NETWORK SERVICES
with the IP addresses 192.168.1.18 and 192.168.1.19, respectively, have been added to the network. These two machines will be used by the buko and saging computers only. To create that setup, you will use the group declaration statement shown in Listing 11-4. Listing 11-4. The group Declaration Statement for the Hosts with Fixed Addresses group { option routers 192.168.1.20; option domain-name-servers 192.168.1.18,192.168.1.19; host buko { hardware ethernet 00:16:3E:6B:BC:16; fixed-address 192.168.1.4; } host saging { hardware ethernet 00:16:3E:3F:2D:BF; fixed-address 192.168.1.5; } } Whenever those machines load, they will use the new router and new domain name servers assigned for them only. To find more statements available to use, consult the man pages for dhcpd.conf.
The NTP Server
When you are about to begin providing any kind of service using your CentOS installation, it is highly recommended that you put in a facility to synchronize time. You might think that the local timestamps of the individual machines are sufficient, but there will be cases where that would be inadequate. For example, try to check the time set on your machine against your friend s laptop. It is most likely that the both of you may have the same hour but the minutes may well be different. Now ask yourself which time is the most correct one, between the two machines You can declare yours as official, but the same could be said by your friend. That s a very simple example, but it can extend to production systems that require accurate time. Some applications include system log servers, database replication, and time tracking systems. When some intruder messes with your system, the first thing to ask is when it actually happened. If you do not have a synchronization scheme available, it would be awkward to report to the authorities that the attack took place at your machine s time. This would make investigation difficult because no one is sure if the system remained intact after the attack. The answer to this problem is to use Network Time Protocol (NTP) as the mechanism to synchronize timestamps in your machines. Network Time Protocol was designed to synchronize time through the network using a common time scale. The time scale is usually in Coordinated Universal Time (UTC) by default. NTP is organized according to levels, known as strata. Strata on the highest level are the real source of synchronized time data. Public time servers reside on that level and are connected to stratum 0 devices such as atomic clocks, GPS clocks, and other types of radio clocks. Strata one level lower from the highest refer time to them. These are also known as second-level strata. The more strata are concatenated, the lower they become. The lowest stratum is 16, which is assigned to newly run servers. Figure 11-2 shows how the strata are grouped into levels.
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