dns tunneling

Ten simple methods to mitigate DNS-based DDoS attacks Researchers found that attackers often use UDP flood attacks (UDP floods) in massive bandwidth-based DDoS attacks (Distributed Denial of Service attacks ). Because UDP is a connectionless protocol, attackers can use scripts to generate UDP packets easily.DNS mainly uses UDP protocol, but in some special cases, DNS also chooses to use TCP protocol accordi

(1) restrict name server recursive query Disabling recursive queries can enable the name server to enter the passive mode. When it sends a query request to an external DNS, it will only answer the query request for its authorized domain, instead of caching any external data, therefore, it is impossible to suffer from cache poisoning attacks, but such actions also have negative effects, reducing the speed and efficiency of

ADSL modem VPI, VCI, and DNS information in various regionsGuangxi 0 35 DNS 202.103.224.68Beijing 0 35 DNS 202.106.196.115Guangdong Zhongshan 0 35 DNS: 202.96.128.68Hunan 0 35, DNS: 211.98.2.4Fujian, 0 200, DNS: 202.101.98.55 and

DNS domain name resolution The purpose of the domain name resolution is to convert the website name that users use to the TCP/IP protocol, and hostname is just convenient for people to remember, after all, IP is a pure digital address to the user is very unfriendly. However, when using TCP/IP communication, the computer is implemented through the IP address +port port number, so when we type a host name in the browser, we eventually need to convert

With Windows PowerShell, Windows-plus DNS servers. From the point of view of adjusting DNS server to resolve IP time period, solve the problem of load balance of website.WIN2012R2, a list of commands for managing DNS servers with PowerShellPS c:\users\admin> Get-command *-module dnsserverCommandType Name ModuleName----------- ---- ----------Alias Export-dnsserver

Build a DNS server by yourself Preface: During normal internet access, domain names are all accessed. How can we convert domain names to IP addresses? What about accessing our server host? In this case, you need to use the DNS server. DNS is composed of a domain name parser and a Domain Name Server. A Domain Name Server is a server that stores the domain names an

In actual application, DNS resolution errors may occur, that is, when we access a domain name, it cannot be resolved to an IP address, however, you can directly enter the website IP address for normal access, which is caused by a DNS resolution failure..Common Causes of DNS failure include:The domain name itself has expired or has been stopped;The

Code 9527---DNS Protocol In Zhou xingchi's movie Tang bohu's qiuxiang, As soon as Zhou xingchi entered Washington, he was forced to add a code 9527. From then on, Washington started to call the main character 9527, rather than his name. Domain name is the IP address code. A domain name generally consists of characters. For humans, domain names composed of characters, such as www.yahoo.com, are easier to remember than IP addresses composed of pure n

What is DNS tunnel? DNS tunnel is the DNS tunnel. The DNS query process is used to establish a tunnel and transmit data. Why use DNS tunnel? When you are in a hotel, airport or other public place, there is usually a Wi-Fi signal, but when you visit a website, such as _______

From: http://blog.csdn.net/cz_hyf/archive/2006/02/19/603022.aspx If a user node wants to obtain the corresponding "dpt1The IP address of. SEU. edu. cn. The processing of this node is as follows:1) send a "Answer" request to the local DNS server. To improve work efficiency, use the connectionless datagram service. If the local DNS server knows the corresponding dpt1. Seu. edu. if the local

1. What is DNSDNS: Domain Name Service, which is a hierarchical computer and network Service naming system that implements name resolution (HOSTNAMEDNS uses the C/s architecture, and the service listens on port 53rd of the host's tcp/udp. Transport Layer protocol UDP is used for domain name resolution, TCP for zone transferLocal name resolution file: Hosts (host limited time available)/etc/hosts%windows%/system32/drivers/etc/hosts2.dns ArchitectureA t

The probability of this phenomenon is relatively large, so this article will be from the beginning of zero to teach readers some basic troubleshooting DNS troubleshooting methods. first, what is a DNS resolution failure? Generally speaking, as we visit the www.jb51.net,www.kanshule.com these addresses are called domain names, and it is well known that any host in the network is the IP address to identif

Each IP address can have a host name that consists of one or more strings separated by a decimal point. With the hostname, do not memorize each IP device IP address, just remember the relative intuitive meaningful host name on the line. This is the function that the DNS protocol will perform.Today we will discuss DNS servers, especially Linux DNS servers, and how

Windows2000 as a brand new operating system, its biggest feature is the introduction of Active Directory, and the Active Directory is one of the biggest feature of the DNS and Active Directory tightly together. So how do they work together and what do they do? This often becomes a puzzle for beginners. In this paper, we will make a brief discussion on the relationship between the two, hoping to help you. A The difference between the two The combinatio

One of the most popular vulnerabilities recently discovered by the DNS protocol itself is a serious problem (cert vu #800113 ). Most of the domestic media reports are vague, so I want to talk about the vulnerability. First, we need to clarify the first question: how is DNS query performed? For most desktop systems, DNS queries are not completed by their own machi

A: What is DNS why there is DNSDomain Name Systems (English: Domain Name System, abbreviation: DNS) is a service of the Internet. The internet was born early because the number of access to the Internet is very small, there is no dedicated DNS server to the entire Internet domain name, at that time only in our host file records the host and IP corresponding relat

In the actual application process may encounter the problem of DNS parsing errors, that is, when we access a domain name can not be completed to resolve the work of the IP address, and the direct input of the Web site IP can be normal access, this is because of DNS resolution failure caused. The probability of this phenomenon is relatively large, so this article will be from the beginning of zero to teach r

DNS stands for the DomainNameSystem domain name resolution system. In general, DNS is a resolution service that helps users find the corresponding names and IP addresses on the Internet. To make it easier to use network resources, DNS provides a method to associate a computer or service name with an IP address. The name must be easier to understand and remember t

Linux Study Notes-DNS server settings　 Recommender: sheke Information Release Date: Background:---- The company uses a leased line to connect to Chinanet and obtains a section of class c ip address space (for example, 16). At the same time, it applies to chinanic for the Company domain name yourdomain.com, And now sets up a machine as the DNS server, it is also set as a firewall.Obje

# DNS Server > D is the region.N is the nameS is a service ### DNS services > 1. cache Domain Name ServerYou can find the domain name resolution for you, but it cannot be resolved.Go to the public network to find the real Domain Name Server, go to the domain name resolution, after you come back, put it in your own cache, it is for you, you are requesting the same data it has > 2. Primary Domain Name Resolut