The IP assigned by DHCP is the same as the set IP address, but it cannot access addresses across net

If there is a problem with the configuration of your gateway device, if you can access the Internet, you must have done NAT conversion, which has nothing to do with the need for access.

First of all, you have to determine whether the subnet mask is the same as your own network segment, if the same is in the same network segment, you can access it without routing, if the subnet mask is different "ordinary people are used to 3 255" then you have to make a route on the gateway, ip route, the subnet mask written when the gateway configures the route is an antimask. 3 255 is, if there are 2 over there, it is. Depending on what device your gateway uses, I remember that Cisco uses a reverse mask, and Huawei's seems to use a positive mask.

When the NIC is set to automatically obtain IP addresses.

There is a backup configuration.

The purpose is to prevent the DHCP service from going down.

or in the event of a malfunction.

If your DHCP server is normal.

Don't set up an alternate IP address and DHCP

Delete them all and try again.

Check the ARP virus on your machine.

It is estimated that this is the reason.

Maybe there's something wrong with the mask of your address. According to the DHCP allocation, the mask is that it is on the same network segment as the Banbantong server, and such a mask is usually not used. When you manually set the fixed IP address, the mask should be different, right?

It should be a licensing issue. Banbantong has never heard of it. It is estimated that the server has restricted access to only the addresses assigned by a certain DHCP service.

Simple implementation of DHCP multi-scope:

For multi-scope configurations, you must ensure that the DHCP server is able to listen for requests from all subnet clients, and the following is the basic way to configure multi-scope, add multiple NICs to DHCP to connect to each subnet, and publish multi-scope claims.

Note: When dividing subnets, if you choose to directly configure multi-scope to implement dynamic IP assignment, you must add multiple NICs to the DHCP server and configure multiple IP addresses, otherwise the DHCP server can only assign the scope of the CIDR block corresponding to the IP address of the existing NIC.

Two scopes are implemented with dual NICs.

1) Configure the IP address of the NIC.

If a DHCP server has multiple NICs, you need to run the ifconfig command to configure an independent IP address for each NIC.

ifconfig eth0 netmask

ifconfig eth1 netmask

2) Main profile.

After the DHCP server network environment is set up, you can configure the multi-scope configuration file in the main configuration file.

Summary. As far as the description, 1If the IP address entered is not used, then there will be no IP conflict. After the IP address is used, DHCP can no longer assign the used IP address.

2.If the entered IP address has been assigned by DHCP, a conflict will be displayed.

DHCP automatic IP assignment is enabled in the LAN, and someone manually enters the IP and does not automatically obtain it, so there will be no IP address conflict!

As far as the description, 1If the IP address entered is not used, then there will be no IP conflict. After the IP address is used, DHCP can no longer assign the used IP address. 2.If the entered IP address has been assigned by DHCP, a conflict will be displayed.

Thank you. So, there are no IP address conflicts.

You're welcome, if you have any doubts, you continue to ask.

For example, if there are 100 or 200 computers on the intranet, the address pool can be adjusted according to the network management requirements.

If you are a network administrator and need to adjust the capacity of the DHCP address pool, you cannot simply adjust the number of IP addresses. At this time, the subnet mask is used, that is to say, how many computers can be accommodated in a network segment is determined by the subnet mask, for example, what you said about 255 is actually in the case of "subnet mask", but even in this case, because all 0 and all 1 addresses are not used by default, the actual available addresses are 254.

If not, you can expand the address range to 254 or 253.

The default of normal routers is a total of 100 IP addresses from 100 to 199, you can manually change the router settings, DHCP pool, such as from 10 to 253

LAN DHCP address ranges are related to the router's management IP address and mask. By default, the router management IP address is set to Mask is , then the default DHCP range is a total of 100 IP addresses, and the range that can be set is;

If the CIDR block of the router's management IP address is modified, the CIDR block of DHCP will automatically change and only the host ID can be modified.

Why go to 256? It is set based on network capacity and number of users.

The secondary router is attached to the switch and is not connected to a computer or other device, only providing a wireless wifi signal.

If the secondary router has DHCP service turned on and uses a different network segment from the primary router, then it will make a DHCP broadcast request to the switch, but since there are no devices connected to the secondary router, the broadcast request will not be answered.

Since no DHCP response was received, the 3 computers were unable to obtain the IP address assigned by the secondary router to the DHCP of the orchestrator.

Therefore, in this case, if you want the 3 computers to be able to get the IP address assigned by the DHCP of the secondary router, you need to connect the secondary router to the switch, and at least one computer is connected to the secondary router. In this way, when the secondary router makes a DHCP broadcast request, the computer connected to the secondary orange driver can receive a response and obtain the IP address.

DHCP is a network protocol that automatically assigns IP addresses to hosts. When the device is connected to the network, it sends a request to the DHCP server to get the IP address. The DHCP Service Lead Gripper assigns an available IP address to the device based on a pre-configured configuration.

Some of the possible problems are as follows:

IP Address Conflict: If a device has already been assigned a certain IP address, the DHCP server can still assign the same IP address to another device, which can lead to IP address conflicts. To solve this problem, you can use a static IP address or lease the DHCP server for a shorter period so that the IP address can be reassigned more frequently.

DHCP Server Failure: If the DHCP server fails, or does not boot, the device will not be able to obtain an IP address. The solution to this problem is to check if the DHCP server is running and confirm that it is configured correctly.

Mask and gateway issues: The DHCP server not only assigns IP addresses, but also sub-segment sparse network masks and gateways. If the assigned mask or gateway is incorrect, the device will not work on the network.

To solve this problem, you can manually set the network parameters of the device, or check whether the configuration of the DHCP server is correct.

The DHCP server is overloaded: The DHCP server may not be able to handle too many requests, which results in the device not being able to obtain an IP address. The solution to this problem is to increase the configuration of the DHCP server, increase the number of DHCP servers, or adjust the settings of the DHCP server.

In short, DHCP is a convenient network protocol that can automatically assign IP addresses to hosts, but we still need to carefully configure, manage, and monitor DHCP servers to ensure network stability and security.

According to the description, the three computers are directly connected to the switch, and the secondary router is connected to the main router through the switch, so the three computers can only obtain the IP address assigned by the DHCP of the primary router, but cannot obtain the IP address assigned by the DHCP of the secondary router.

In this network structure, the role of the secondary router is only to provide services to the wireless network, and it does not affect the way the computers connected under the switch obtain the IP address. Therefore, even if DHCP is turned on on on the secondary router, it will only assign an IP address to the phone connected to it and will not affect the computers under the switch.

In addition, the primary and secondary routers are two different network segments, which means that they communicate with each other through the router, rather than being directly connected. As a result, even if the secondary router is assigned an IP address, the computer cannot directly access the devices or resources on the secondary router.

Answer: You need to read the DHCP protocol server to preferentially distribute the first IP address that has not yet been leased, and every time the DHCP client relogs in to the network, it does not need to send DHCP Discover discovery information, but directly sends DHCP request information containing the IP address assigned before. When the DHCP server receives this message, it attempts to get the DHCP client to continue using the original IP address and acknowledges the message with a DHCP ACK.

If the IP address is no longer available to the original DHCP client (as if the IP address has been assigned to another DHCP client), the DHCP server denies the DHCP client a DHCP NACK. When the original DHCP client receives this DHCP NACK denial message, it must resend the DHCP Discover discovery message to request a new IP address. In addition, the IP addresses leased by the DHCP server to the DHCP client generally have a lease period, after which the DHCP server will take back the leased IP address.

If a DHCP client wants to extend its IP lease, it must renew its IP lease. Both when the DHCP client starts up and when the IP lease term is halfway through, the DHCP client automatically sends a message to the DHCP server to renew its IP lease. For the sake of understanding, the DHCP client is compared to a guest in a restaurant, the DHCP server is compared to a waiter (there can be multiple waiters in a restaurant), and the IP address is compared to the food that the customer needs.

So you can describe the whole process like this: the customer walks into the restaurant and asks, "Is there a waiter?"

DHCP Discover), multiple waiters choose the top food from the food that has not yet been sold (the first IP address that has not yet been rented) and select and choose: "Yes, I have a burger here" (DHCP Offer), "Yes, I have chicken wings here.""”。The guest said:

Okay, I want a burger" (DHCP Request, this guest is more rigid and always chooses the food he hears for the first time), and the waiter with the burger responds: "Here it is" (DHCP ACK), and brings the food to the customer for him to enjoy (bind the network card to the IP address). The next time the customer comes, they will go directly to the waiter who ordered their favorite burger (dhcp request), if there is still a hamburger, the waiter will reconfirm and serve the food (dhcp ack), and if it is sold out, the waiter will tell the customer:

Sorry, it's sold out" (DHCP Nack). Of course, the waiter will come to clean up the table every once in a while, and unless the customer specifically states that the dish will be continued, the waiter will take the leftovers away. It is possible that the IP address of your machine is fixed every time you turn it on.

Another one within the segment when your machine was first booted.

Category A: Category B: Huisong.

Options B and D are public IP addresses, and only option C is available.

Is this question so complicated?

Since it doesn't work automatically, you can fill in one manually first, see if you can ping the same external network and intranet, if you can, it's a matter of service, check the configuration file. If not, there is a problem with the client, most likely on the network card or driver. Such a simple question I don't understand why it makes your discussion so complicated ...

And the guy upstairs, DHCP is on by default.

Start running the input: Enter, find the DHCP service - set the drop-down to select automatic-click and then click to start! Reboot!

You can directly modify the MAC address of your network card.。。。

I'll answer that question! XP system, right-click on my computer --Properties --Manage --Services --Find DHCP Service --Enable --OK.

Uninstall the network card, reinstall it, try the old version or the latest version, is there an automatic allocation of DNS and win servers?