Scope : A complete IP addresses, DHCP protocol in accordance with the scope to manage the distribution network, assign IP addresses and other configuration parameters.
Superscope : for managing a plurality of logical sub-segments in the same physical network. Super scope contains a list of scopes can be unified management.
Exclusion ranges: the scope of certain IP addresses to exclude, to ensure that these IP addresses are not assigned to a DHCP client.
Address pool : After defining DHCP scope and range of application of the exclusion, the remaining range to dynamically assigns IP addresses to the DHCP client.
Lease : DHCP client can use the IP address of the time allocated dynamically.
Reservation : to ensure a particular network device is always the same IP address acquired.
Profile dhcp service program in only three rows comment statement, which means that we need to write this file yourself. If the reader does not know how to write, you can look at the example file configuration file reference line 2, the composition of the architecture shown in Figure 14-2.
A standard configuration file should include global configuration parameters, subnet statement, address configuration options, and address configuration parameters. Among them, the global configuration parameters for the overall operation parameters defined dhcpd service program; subnet statement is used to configure the entire subnet address attributes.
Common mail protocol has these.
Simple Mail Transfer Protocol (the Simple Mail Transfer Protocol, the SMTP) 25 / TCP port used to send e-mail and transit issued occupancy server:
Post Office Protocol version 3 (Post Office Protocol 3) : used to store e-mail to the local host, occupying server 110 / TCP port.
Internet Message Access Protocol version 4 (the Message Internet Access Protocol 4) : for 143 / TCP port on the local host access e-mail, take the server.
