wireshark dns query

1.DNS Query process: Take query www.baidu.com as an example (1) The computer sends the request of parsing www.baidu.com to the local domain name server(2) The local domain name server receives the request, first inquires the local cache, if finds the direct return query result, if does not have this record, the local

Reprint Please specify Source: http://blog.csdn.net/luotuo44/article/details/45545059DNS (domain Name System), readers have heard more or less that the domain name can be converted to an IP system. Makes it possible for us to access a website simply by remembering the domain name rather than the IP. When we enter a URL in the browser, the browser will send a query request to the local DNS server, the local

Most network communication is based on TCP/IP, while TCP/IP communication is based on IP addresses. But in real-world network access, who would like to use IP addresses for access? We cannot remember the IP addresses. To solve this problem, we have DNS. DNS: When a domain name system user accesses the Internet, the user enters www.luwenju.com as a computer name, and the user's computer delivers it to the

DNS System of edu. CN; 4) The local DNS system accesses the DNS of edu. CN and obtains the IP address of the DNS System of SEU. edu. CN; 5) The local DNS system accesses the DNS of SEU. edu. cn to obtain dpt1.The IP address o

Java internal DNS query implementation and parameter settings1. Java internal DNS query Java uses its own internal domain name implementation mechanism for domain name query, and finally submits it to InetAddress for DNS resolutio

Dns.c Copy Code code as follows: /* * DNS Query Program on Linux * * author:ismdeep@live.com * * */ Header Files #include #include #include #include #include #include #include List of DNS Servers registered on the systemChar dns_servers[10][100];int dns_server_count = 0;Types of DNS resource reco

I. Host directiveFormat: Host [-A] FQDN [server]HOST-L domain [Server]Options:-A: Represents a list of all relevant information about the host, including IP, TTL, and error-removing messages, etc.-L: If the next domain setting allows Allow-transfer, then list all host name data that the domain manages!Server: This parameter is optional, when you want to use a non-/etc/resolv.conf DNS host to query the host

1. install the software packages dig and nslookup. Centos: # yuminstallbind-utilsDebian: # apt-getupdate # apt-getinstalldnsutils set the dns server IP address in/etc/resolv. conf before querying. II. usage 1. install the software packageInstall related software packages for dig and nslookup. Centos:# yum install bind-utilsDebian:# apt-get update# apt-get install dnsutilsIn addition, you must set the dns se

DNSMASQ is a lightweight DNS, TFTP, and DHCP server. It is designed to provide paired DNS and DHCP services to the LAN. DNSMASQ accepts DNS queries and answers them from a small local cache or forwards them to a true recursive DNS server. The software is also installed on many inexpensive routers to cache

takes some time, but a lot of friends urgent need to query DNS is effective then we can query the new DNS server is effective? DNS server queries are simple and require a few steps. 1. Open CMD.EXE (that is, the command prompt in the Windows attachment). 2. After enterin

This is a creation in Article, where the information may have evolved or changed. Recent on-line reverse proxy Exception Log: Lookup / http xxx.xxx.com On 10.0.0.1:53:dial UDP 10.0.0.1:53:i/o timeout, which is obviously caused by a DNS query timeout. But the problem is, Golang in the dial UDP operation is simply to create Epoll object, there is no real I/O operation, talk about what time-out? In this case,