reverse dns ip lookup

Lab questions: 1. Forward/reverse DNS resolution 2. Master-slave DNS Synchronization Lab environment: 1. vmwarevm 2. More than two Linux sub-Machines 3. XP Testing Machine Experiment process: 1. forward and reverse DNS resolution Tutorial topology: 650) This. width = 650;

.mageedu.com. Admin. Mageedu.com. (201509241H5MThe6H)Mageedu.com. In NS ns1.mageedu.com.Mageedu.com. In MX ten mail.mageedu.com.NS1 in A 192.168.9.250Mail in A 192.168.9.251WWW in A 192.168.9.252WWW in A 192.168.9.253FTP in CNAME WWWSave Chown root:named Mageedu.com.zone; chmod 640 Mageedu.com.zonevim/etc/resolv.conf Edit Search Localdomain nameserver 192.168.9.247Start Services: Service named restartDig-t A www.mageedu.comDig-x IP: Check hostname acc

. There's a point in the end that can't be omitted.The third step is to test the configuration file and parse the library file with or without errorsInspection Tools①named-checkconf: Checking the syntax and integrity of the configuration file②named-checkzone: Check the syntax and integrity of the zone resolution library fileUsage: named-checkzone zonename filenameFor example Named-checkzone zone name/var/named/zone_name.zone* * Step Fourth: Modify PermissionsChown Root:named/var/named/lishuai.co

MySQL database received a network connection, first get the IP address of the other side, and then the IP address for the reverse DNS resolution to get this IP address corresponding host name. Use the host name in the permission system to determine the permissions.

reverse Domain name resolution, in contrast to the usual forward domain resolution, provides IP address to the corresponding domain name. IP Reverse resolution is primarily applied to mail servers to block spam, especially in foreign countries. most spammers use dynamically assigned or unregistered domain names.

Experimental Requirements: Establish DNS the principal and subordinate domain name server implements forward reverse queryExperimental steps:1. forward QueryMount and install first Bind Software650) this.width=650; "title=" 1.png "src=" Http://s3.51cto.com/wyfs02/M01/5A/33/wKioL1T5omLwr-5cAAMnrki4uE4271.jpg " alt= "Wkiol1t5omlwr-5caamnrki4ue4271.jpg"/>View working directory650) this.width=650; "title=" 2.p

. It is assumed that MySQL uses DNS when a user establishes a connection. Because the configured DNS cannot be accessed, MySQL will wait until the network times out. I found related information online and found that MySQL does perform DNS lookup on the Client IP address duri

Spam in the flood of today, spam to our lives, work, learning has brought great harm. Because of the lack of effective authentication mechanism between SMTP servers, even if the use of spam identification blocking technology is still common, and the spam identification and blocking technology is mainly in the receipt of letters according to a certain condition to identify, the need to consume a large number of server resources, if the letter to the server before the adoption of a , this will gre

correspond to multiple IP addresses, but at the same time, a domain name can only have an IP address, an IP address can correspond to multiple domain names. 3. Query DNS Python can implement forward and reverse queries for DNS.