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If you are dividing your network space into several subnetworks, you can use a single DHCP server to manage them In that case, you will have a subnet declaration for each subnetwork If you are setting up your own small network, you use a network address
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beginning with 192168 The range specifies possible IP addresses within that network so, for a network with the address 19216800, you create a subnet declaration with the netmask 2552552550 Within this declaration, you place a range declaration along with any other information you want to give to your client hosts In the following example, a range of IP addresses extending from 19216801 to 192168075 can be allocated to the hosts on that network:
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subnet 19216800 netmask 2552552550 { range 19216805 192168075; }
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You may want to specify different policies for each subnetwork, such as different lease times Any entries in a subnet declaration will override global settings So if you already have a global lease time set, a lease setting in a subnet declaration will override it for that subnet The next example sets different lease times for different subnets, as well as different address allocations The lease times for the first subnet are taken from the global lease time settings, whereas the second subnet defines its own lease times:
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default-lease-time 21600; max-lease-time 43200; subnet 19216810 netmask 2552552550 { range 19216805 192168075; } subnet 1921681128 netmask 255255255252 { range 1921680129 1921680215; default-lease-time 56000; max-lease-time 62000; }
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If your subnetworks are part of the same physical network, you need to inform the server of this fact by declaring them shared networks You do this by placing subnet declarations within a shared-network declaration, specifying the shared network s name The name can be any descriptive name, though you can use the domain name Any options specified within the shared-network declaration and outside the subnet declarations will be global to those subnets In the next example, the subnets are part of the same physical network and so are placed within a shared-network declaration:
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shared-network mytrekcom { default-lease-time 21600; max-lease-time 43200; subnet 19216810 netmask 2552552550 { range 19216805 192168075; } subnet 1921681128 netmask 255255255252 { range 1921680129 1921680215; default-lease-time 56000; max-lease-time 62000; } }
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Network Autoconfiguration with IPv6, DHCPv6, and DHCP
NOTE Within a network, you can have some subnets that run DHCP servers and some that don t
In that case, you can use the DHCP Relay Agent to let DHCP clients on a subnet without a DHCP server use a DHCP server running on another subnet The DHCP Relay Agent, dhcrelay, can be managed with the service command It is configured with the /etc/ sysconfig/dhcrelay file, where you can specify the network interfaces to receive requests from and the DHCP servers to use
DHCP Fixed Addresses
Instead of using a pool of possible IP addresses for your hosts, you may want to give each one a specific addresses Using the DHCP server still gives you control over which address will be assigned to a given host However, to assign an address to a particular host, you need to know the hardware address for that host s network interface card (NIC) In effect, you have to inform the DHCP server that it has to associate a particular network connection device with a specified IP address To do that, the DHCP server needs to know which network device you are referring to You can identify a network device by its hardware address, known as its MAC address To find out a client s hardware address, you log in to the client and use the ifconfig command to find out information about your network devices To list all network devices, use the -a option If you know your network device name, you can use that The next example will list all information about the first Ethernet device, eth0:
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