mxtoolbox reverse dns

In the day-to-day IT operations, we often need to query the IP address of the corresponding host name, as well as anti-spam often use the Reverse address query function. DNS itself can also be used to complete the reverse resolution of the address settings, the type of reverse query we call it a PTR record (the

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 according to IPHOST-T RT Name: Parse result of q

器存放文件/var/named/named.empty/var/named/named.localhost/var/named/named.loopbackZone Resolution library file:/var/named/zone_name.zoneDig,host,nslookup is the DNS test toolHere we have four experiments to explain the DNS configuration of four differentConfiguring BIND for forward parsingConfiguring a reverse-resolved bindConfigure secondary BindImplementing zone tr

Tags: cache tin image TAB manage exp Res try LookupDns_bind_ forward and reverse domain name resolutionBind Service supports TSIG Secure encryption transfer mechanismDNS domain name resolution service for resolving domain name and IP address correspondence Serviceforward parsing: Based on the domain name lookup corresponding IP AddressReverse parsing: based on IP address lookup for the corresponding domain nameDNS structure Model:however, depending on

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 DNS parsing is time-consuming and can make use

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. IP address to send spam to evade tracking, using the domain name

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

First, reverse zone: The domain name is resolved to IP====================================================================================Note Close Iptables,selinuxOne, DNS server R reverse resolution required environment1. Three machines are needed. First: 192.168.137.140 do DNS server needs to install bind

Environment Description:192.168.1.1: Build Dns+nginx Service192.168.1.2: Building Nginx Service650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/72/7D/wKioL1XlFSiSnPHgAADln-p9zsw640.jpg "title=" dns+ Nginx reverse proxy. png "height=" 341 "width=" 620 "alt=" Wkiol1xlfsisnphgaadln-p9zsw640.jpg "/>Build as follows:1. yum-y Install DNSMASQ Installation

After the MySQL database receives a network connection, it first obtains the IP address of the other party, and then performs reverse DNS resolution on the IP address to obtain the host name corresponding to the IP address. Use the host name in the permission system for permission determination. Reverse DNS resolution

Let's say your server IP is 211.147.9.106 1 First, you should know which DNS server is responsible for this IP's reverse domain name resolution. You can use this page to query reverse domain name resolution information http://www.dnsstuff.com/tools/ptr.ch?ip=211.147.9.106 Look at the last paragraph. Details: ns.cnc.ac.cn. (a authoritative nameserver for 147.2

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. The following is the code for the forward query: Copy Code code as follows: #!/usr/bin/env python Import Sys,socket

Tags: alt 9.png img Resolve DNS server span role reverse add1. Configure the From server role for the specified zone2.Check if there is a problem with the server configuration file3. Modify the primary server reverse zone database fileTo add a reverse resolution address from the server4. Check the primary server's conf

This morning the bean accidentally found that the company's DNS server above only the forward parsing, and there is no corresponding PTR record. In other words, the IP address can be resolved by the domain name, but the reverse IP address is not able to find the domain name.1 hours wrote a very simple script, to determine whether there are existing records of the corresponding

By default, mysql will automatically reverse parse. If we cannot handle the problem, we will find a large number of unauthenticated user prompts when viewing show processlist, the following describes how to solve unauthenticated user. Example The Code is as follows: Copy code Mysql> show processlist;| 20681949 | unauthenticated user | A. B .C.D: 52497 | NULL | Connect | Reading from net | NULL || 20681948 | unauthenticated user