upstream isp

, attackers can use similar methods to obtain information about the client. Attackers can achieve this in various ways, including phishing emails and direct queries. The problem described in VU #800113 this time is that most DNS Cache servers have one or all of these two vulnerabilities. After talking about the attack principle, I think more people will be concerned about the following: what can we do? If you are a desktop user, the best way is to wait for the company or

/named. conf. option file, enable forwarders, and enter the correct upstream DNS server, that is, the server that the ISP gives in the format: Forwarders {202.96.128.86 ;}; I. Bind main files/Etc/bind/named. conf /Etc/bind/named. conf. Local 2. instance {Host (a) ip192.168.1.122/24 www.hp6515b.com | host (B) ip192.168.1.193/24} ① Edit named. conf. Local Add the following statements // Reverse Region Zone "1

How to Use DNS + geoip + nginx + varnish as a world-class CDN How to use bind, geoip, nginx, and varnish to create your own efficient CDN network?CDN stands for content distrubtion Network, which is a content delivery network. In short, it refers to Server Load balancer in all regions. The concept of a whole region can be national or global. The unified DNS server performs address forwarding and selects the region server closest to the user for load balancing. In essence, Server Load balancer is

Article title: Introduction to VRRP in Linux. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. This article describes how to implement VRRP (Virtual Router Redundancy Protocol) in Linux ). I personally summarized the VRRP process and introduced some basic concepts and principles of VRRP and how to implement VRRP in Linux, 　　 It includes the following parts: 1.

built-in and can ' t be loaded Indicates that the module is built inside, no need to be transferred, comment out #LoadModule Rewrite_module modules/mod_rewrite.so The following are supplementary:then, according to the comments, restart the Web server, sure enough, to and fro, and back and forth, made a lot of time, mainly a thinking question. Find out where the problem is, and then find a way to solve the problem. This is mainly used for recording, save for later. cause A server (not necess

You can try to clear the browser cache access to your FTP to see if you can log in Cause A server (not necessarily a Web server) is a gateway or proxy to meet customer requirements, such as a Web browser or our Checkupdown robot, to access the requested URL. This server received an invalid response from an upstream server to fulfill its requirements. Fixed 502 Error Generally this problem is due to poor IP communication between the backend compute

◆ System Structure For data centers with only basic requirements, the network structure can adopt a three-tier system structure. On the first layer, devices on the Internet connection layer have the following features: High-Speed Routing Switching capability, which provides a Gbps level of system capacity, enables access requests and content traffic to be transferred and controlled between IDCs and multiple ISP networks. Provides comprehensive support

This article is from the "practice test truth" blog How to use BIND, GeoIP, Nginx, and Varnish to create your own efficient CDN network?CDN stands for Content Distrubtion Network, which is a Content delivery Network. In short, it refers to Server Load balancer in all regions. The concept of a whole region can be national or global. The unified DNS server performs address forwarding and selects the region server closest to the user for load balancing. In essence, Server Load balancer is expanded

Introduction to vro redundancy protocol in Linux-Linux Enterprise Application-Linux server application information. The following is a detailed description. This article describes how to implement VRRP (Virtual Router Redundancy Protocol) in Linux ). I personally summarized the VRRP process and introduced some basic concepts and principles of VRRP and how to implement VRRP in Linux. 　　 1. VRRP Introduction When we create a network, dynamic routing protocols such as OSPF and RIP are often used

You can try to clear the browser cache and access your FTP to see if you can log on Cause A server (not necessarily a Web server) serves as a gateway or proxy to meet customer requirements (such as a Web browser or our CheckUpDown robot) to access the requested URL. This server receives an invalid response from the upstream server to fulfill its requirements.Fixed 502 errorsGenerally, this problem is caused by poor communication between IP addresses o

downlink data, because BAS is responsible for allocating and parsing the user's IP, and has the function of the gateway, it receives the destination IP of the packet is the user, so the IP for the index to find the user's information than according to the Mac to be more convenient, this point with the ordinary switch, the specific process with the upstream processing almost 2.3PPPoE support for multiple business choices Multi-service selection refe

allocating and parsing the user's IP, and has the function of the gateway, it receives the destination IP of the packet is the user, so the IP for the index to find the user's information than according to the Mac to be more convenient, this point with the ordinary switch, the specific process with the upstream processing almost 　　 3.3PPPoE support for multiple business choices 　　 Multi-service selection refers to the user through a PPP connection to

This article describes how to implement VRRP under Linux (Virtual Router redundancy Protocol The redundancy protocol for the router). I am in the learning VRRP process of a small summary, and combined with a number of other information on VRRP some of the basic concepts, principles and how Linux to achieve VRRP an introduction. 1, VRRP Introduction When we set up a network, in order to ensure stable and uninterrupted operation of the network, often adopt some dynamic routing protocols, such as

access.ErrorLog, you can get the performance bottleneck of a system service or server. Therefore, you can get a lot of valuable information by making full use of logs.2. Access logs [Access. log] Log_format main '$ remote_addr$ Remote_user [$ time_local] "$ request" $ http_host' '$ Status $ upstream_status$ Body_bytes_sent "$ http_referer "' '"$ Http_user_agent"$ Ssl_protocol $ ssl_cipher $ upstream_addr' '$ Request_time$ Upstream_response_time ';

backbone network, people connected to it through the IPIP (IP Encapsulation IP) tunnel. The Unix program mrouted can understand the DVMRP and IGMP protocols, but the Internet Router cannot. Many customers who want to adopt Multicast technology are still asking their ISP why some protocols do not work. DVMRP refers to the distance vector multicast routing protocol. It uses IGMP subcode 13 and implements the so-called Dense Flooding ). Dense Flooding i

Router WAN Interface ConfigurationSecond, CE1/PRI interface configuration and managementYou can use the Ce1/pri interface when you need to transfer your business through the E1 system. E1 system and T1 system are a kind of access line standard of WAN leased line, all belong to PDH (plesiochronous digital Hierarchy, quasi-synchronous system) system. T1 Support 1.544MBIT/S line telephone data transmission, composed of 24 independent channels, each channel transmission rate is 64kbit/s, can simulta

bandwidth. 4. it limits SMTP and pop3 speed. 5. it limits unclassified bandwidth. 6. ensure that uploading does not affect downloading. uploading data streams may affect downloading speed, this is a common phenomenon. 7. limit the download rate of each IP address. 8. priority levels for obtaining idle bandwidth, such as interactive data, FTP-data, smtp, pop3, and web browsing, other business priorities are at least two. method: [/color6] 1. (eth0) use HTB to divide it into five types: for examp