Shulou(Shulou.com)06/03 Report--

DHCP Server has four processes.

Analyze the scene.

For example: I want to access the Internet, for DHCP this server, is how to achieve?

1. First I send out this radio message,"I want to go online."

2. After receiving your broadcast message, the server will randomly assign an unused IP address from the existing address pool to you

3. Then after you receive the IP address from the server, you will send a broadcast message to this server and other servers in the network that provide your own Internet access. Now this address is for me. Don't give it to others.

4. The server receives the client's request and then gives the client a response, OK.

And that corresponds to these four processes.

1.DHCPDISCOVER

2.DHCPOFFER

3.DHCPREQUEST

4.DHCPACK

DHCP this server working principle is actually simple to say two words, say difficult working principle or more complex

DHCP server principle although complex, but the use of extremely simple methods, simple not to say, say something technical depth

1. Multiple scopes can be created on a DHCP server, using different network segments.

2. Address pool is to create a good DHCP scope, in the following will appear a series of functions and properties provided by these DHCP servers, address pool is one of them.

2.1 Address pool: The IP address range you assign to this DHCP server, address 2.2 Lease: How long the lease is used by the tenant, you can set the modification

2.3 reserved address reserved for users of features

What is the relationship between server options and scope options?

A containment relationship can be used to describe server options containing scope options.

You create a service in the scope option, not in the server option, but if you create it in the server option, each has its own benefits, if you want to apply a small scope of a better ability, then use the scope option is better than the server option, this depends on the specific situation

Yesterday, if you want to solve the problem of setting up a domain controller in the network, after another client connects to the network, if it is automatically obtained IP address, it can also be directly connected to the Internet through DHCP server. The details are as follows:

DNS server, then it will be more complex, Internet access is required DNS, no DNS is not on the network

According to the query method: divided into two types

One is recursive query and the other is iterative query.

Recursive query: A query between client and server

Iterative query: A query between servers.

The query method through DNS itself is divided into two types.

One is the forward query area and the other is the reverse query area.

Forward lookup zone: the process of finding IP addresses by domain name (forward resolution)

Reverse lookup zone: The process of finding domain names by IP address (reverse resolution)

When creating a new domain, there are primary zones, secondary zones, and stub zones

Primary zone: refers to the primary DNS server

Secondary zone: refers to DNS backup server

Stub zone: records only the primary free records of the primary DNS server, improving the access efficiency of the primary DNS server

DNS server in addition to this can also configure conditional forwarding, on the network is not likely to exist with the relationship

The following is the complete IP address obtained by the client after configuring DHCP server options and DNS forwarding

Now the computer is of course can access the Internet, the following look at the domain controller this server's main configuration

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