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Anonymous users2024-02-08The first is the system security settings. For example, turning off unnecessary services and ports, as well as user management and password complexity.
Actually, it's a backup. If it's a Windows system. Make a backup of your system. In the event of a DNS failure, the direct recovery system can restore the DNS.
If it is a Linux system, back up the DNS configuration file. so that the DNS service can be replied quickly in the future.
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Anonymous users2024-02-071. When the client makes a query request, it first looks up in the cache of the local upgrade machine. If the query information cannot be obtained locally, the query request is sent to the DNS server.
2. First, the client sends the domain name query request to the local DNS server, and when the local DNS server receives the query, it first finds it in the record of the area managed by the server, and if it finds the record, it uses this record to resolve; If there is no region information to satisfy the query requirements, the server looks up it in the local cache.
3. If the local server cannot find the information queried by the client locally, send the client request to the DNS server of the root domain name.
4. Root name server.
The root domain portion of the client request, which will contain the next floor level.
The DNS server address of the information is returned to the DNS server address of the client.
6. Approach the query target step by step according to the above-mentioned recursive return method, and finally find the corresponding IP address information on the DNS server with the target domain name.
7. The client's local DNS server returns the recursive query results to the client.
8. The client uses the IP queried from the local DNS server to access the target host, and a resolution process is completed.
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Anonymous users2024-02-06The methods are as follows: 1. First, successfully build a DNS server;
<>4. Enter the IP address of the DNS server; Press enter, and the same operation as above can successfully add the IP addresses of multiple ** servers; Select the IP address of the corresponding DNS server and click Move Up to increase the priority of the corresponding ** server. Click Move Down to lower the priority of the corresponding server; Click Delete to delete the corresponding server; As shown in Fig
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Anonymous users2024-02-05The DNS address of the server cannot be resolved, and the hosts can be set or modified using the command line mode.
When a computer accesses a domain name, it is not necessary to ask the DNS server for help every time it accesses, generally speaking, when the resolution work is completed once, the resolution entry will be saved in the DNS cache list of the computer, and the fault can be solved by the command to clear the DNS cache.
Enter the command line mode by "start->run-> cmd", and in the command line mode we can see that in ipconfig ?There is a parameter called flushdns, which is the command to clear the DNS cache.
Execute the ipconfig flushdns command, when the prompt "successfully flushed the DNS resolver cache" appears, it means that the cache information of the current computer has been successfully cleared, and then when we access the domain name, we will go to the DNS server to get the latest resolution address, and there will be no resolution error caused by the previous cache.
Modifying the hosts method is to modify the DNS resolution correspondence in the hosts file to achieve the purpose of correct resolution. When a local computer accesses a domain name, the hosts file in the local system is first viewed, and the resolution relationship in the hosts file takes precedence over the resolution relationship on the DNS server.
In this way, when we want to bind a domain name to an IP address, we can do so by adding a resolution entry to the hosts file.
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Anonymous users2024-02-04The methods are as follows: 1. First, successfully build a DNS server;
<>4. Enter the IP address of the DNS server; Press enter, and the same operation as above can successfully add the IP addresses of multiple ** servers; Select the IP address of the corresponding DNS server and click Move Up to increase the priority of the corresponding ** server. Click Move Down to lower the priority of the corresponding server; Click Delete to delete the corresponding server; As shown in Fig
On the afternoon of December 4th, a number of webmasters reported to Sohu IT that due to the failure of the Xinnet DNS (domain name system) server, many ** could not access normally, and it is expected that tens of thousands of small and medium-sized ** will be affected. >>>More
Generally, the server DNS may not be found for some reason. All you need to do is reset the server DNS to not be automatically fetched. Here's how to modify the DNS. >>>More
A DNS server is the server that does the DNS function: after all, this function must be done by a physical machine with processing capabilities. Local carriers usually have their own DNS server settings, but it is possible that the local server is just a mirror image of a higher-level DNS server, and if there is a resolution request that it cannot complete, it will send the request to a higher-level DNS server. >>>More
When we talk about web server security, the best advice I can give you is not to be a layman. When hackers start attacking your network, they will first check for general security vulnerabilities before considering more difficult ways to breach your security system. So, for example, when all the data on your server is in a FAT partition, even installing all the security software in the world won't help you much. >>>More
After the server creates a session, it will write back the session ID number to the client in the form of a cookie, so that as long as the client's browser is not closed, when accessing the server again, it will go with the session ID number, and the server will use the corresponding session in memory to serve it.