ip origin lookup

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

Vro is the main node device on the Internet. The router determines data forwarding through routing. A forwarding rule is called routing, which is also the origin of the router name (router, forwarder ). As a hub connecting different networks, the

When information needs to be transferred between two networks, the interconnection device of common routers is responsible for the transmission of data. The main work of the router is: The decision of the path and the forwarding of the packet (from

The existing Peer-to-peer implementations can be divided into three different types. They are: Peer-to-peer based on directory servers, unstructured peer-to-peer and structured peer-to-peer. Based on the directory server This kind of system sets up

Implementing reverse proxy in squid Introduction This document describes reverse proxies, and how they are used to improve web server performance. section 1 gives an introduction to reverse proxies, describing what they are and what they are used.

I. DNS basics [DNS System (server) Working Principle and attack protection methodology] DNS: Domain Name System, the Domain Name resolution server. Its role on the Internet is to convert the Domain Name into an IP address that can be recognized by

First, starting with the following structure, he is also included in the ngx_http_upstream_srv_conf_s structure. typedefstruct {/*typedef ngx_int_t (*ngx_http_upstream_init_pt)(ngx_conf_t*cf,ngx_http_upstream_srv_conf_t *us);*/ ngx_http_upstream_

1. Overview E-Mail is one of the most commonly used network applications, and has become an important channel for communication. But spam spam most people, and recent surveys show that 93% of respondents are dissatisfied with the amount of junk mail

Transferred from: http://www.cnblogs.com/loveis715/p/5097475.htmlWhen writing an application, we often consider how the application should implement specific business logic. However, with the gradual development of more and more users, these

Some machines in the company's LAN have a "Duplicate name on the network" problem when they start up. If you can ping other machines in the Intranet, it is normal to connect to the Internet and the computer name cannot be modified. This problem also