recursive dns

;FQDNReverse: Ip-->fqdnForward: Fqdn-->ipIp-->fqdn:FQDN-->IP:Www.magedu.com.IP1Inquire:Recursive: Only one request is issuedIteration: Making multiple requestsAnalytical:Forward: Fqdn-->ipReverse: Ip-->fqdnTwo-stage: recursive, iterativeDNS: Distributed DatabaseThe superior only knows its direct subordinate;Subordinates only know the location of the root;DNS server:Accept local Customer query requests (

DNS Literacy Series 3: Smart DNS (BIND + VIEW) preface: Smart DNS is the function implementation of BIND + VIEW. In China, the first thing we put smart DNS into the market was even (how can we feel unmodest ). I think the introduction of the VIEW function in BIND9.X is not targeted at China, but this function can solve

Recently met a domestic Daniel, heard a call DNS tunnel technology, after a study, found very interesting, record. what is DNS tunnel. DNS tunnel is the DNS tunnel. From the name point of view is to use the DNS query process to establish tunnels, transfer data. Why use

Vim/etc/name. conf Options { Directory "/var/named "; Recursion yes; # define enable recursion. By default, recursion is performed for all users. Allow-recursion {172.16.0.0/16;}; # indicates recursion only for users of this network segment; or define the recursive client source; Allow-query # defines who can perform the query; }; Zone "." In { Type hint; File "named. ca "; Allow-transfer {none ;}; }; Zone "localhost" in { Type master; File "named.

Description We know that some network operators perform DNS operations for some purpose, so that the correct IP address cannot be obtained through the domain name through the normal internet access settings of the ISP. Common methods include:DNS hijackingAndDNS pollution. DNS hijacking and DNS pollution are very common in tianchao. Generally, after an error or no

Intelligent DNS is the function realization of bind+view. At home, the first smart DNS into the market is a I (how to give people not humble feeling it). I think bind9.x introduced view (view) function is not for China, but this function just can solve the interconnection between network operators in China, is the pie in the sky. This article unifies oneself these several years to erect maintains the intell

1 // Tree node defines 2 typedef struct tnode3 {4 int value; 5 tnode * left; 6 tnode * right; 7} * ptnode; 1. Non-Recursive Implementation of forward traversal (based on Recursive ideas) Thoughts: When a node is accessed, it is first put into the stack, assuming that the inbound node is P. Access P and add the right and left children of P to the stack in sequence. This ensures that each time the left chi

saved to the specified file. Statistics-file "/var/named/data/named_stats.txt"; // After the command rndcstats is executed, the statistical data is saved to the specified file. Memstatistics-file "/var/named/data/named_mem_stats.txt"; // file path for recording memory usage data Allow-query {172.31.0.0/16;}; // specifies that DNS query (authoritative data) can be performed only on hosts with intranet network segments) Recursion yes; // This option c

Binary tree traversal (recursive, non-recursive, And clue Binary Tree) and recursive Binary Tree As a basic data structure, binary trees are widely used and are everywhere in our lives. traversal of Binary Trees is very common in binary tree applications. Different from the linear storage structure, each node of a binary tree may have two Subtrees. We can see fro

I. Overview: When listening to the course of yeslab QIN Ke's SecV3 SNF (ASA), the windows host will send a DNS request to the primary DNS and the standby DNS at the same time, so the building environment is ready for verification. Ii. Basic test ideas and conclusions: A. Basic Ideas: ① Configure primary DNS and backup