teredo tunneling

Simple IntroductionLVS (Linux virtual server) is a load balancer software developed by Dr. Zhangwensong, which works on layer four (transport layer).3 types of load modes1.Virtual Server via Network Address translation (Vs/nat )Through the network address translation, the scheduler rewrites the target address of the request message, assigns the request to the backend real server according to the preset scheduling algorithm, and the response message of the real server passes through the scheduler

generally do not open.Options how to ask for supportUsed to query the supported methods of resources specified for the request URI (returns the methods supported by the server, such as GET, POST, HEAD, OPTIONS)Trace Trace PathA method that allows the server to loop back the previous request communication to the clientWhen the request is sent, the number is filled in the Max-forwards header field, minus one for each server, and when the value is just reduced to 0 o'clock, the transmission is sto

Today, let's talk about how to build a PPTP-VPN in linux, PPTP (Point to Point Tunneling Protocol), that is, Point to Point Tunneling Protocol. This protocol is a new enhanced security protocol developed on the basis of the PPP protocol. It supports multi-protocol Virtual Private Network (VPN) and can pass the password verification protocol (PAP) and Extensible Authentication Protocol (EAP) to enhance secur

have a big mouth, a network card can set up multiple IP addresses, and have the same Mac address, yes, they can work Well.27) "lvs-dr. DNS-RR "fortunately, for lvs-dr, Once the scheduler fails, you can immediately switch LVS-DR to DNS-RR mode, which requires just a few additional DNS records to resolve the domain name to the real IP address of multiple actual servers. Once the scheduler resumes, you can modify the DNS records again, point the domain name only to the scheduler, and switch back t

date and time of the resource update. (5) Delete method: Delete File This method, in contrast to put, deletes the specified resource by the request URI. However, because a Web site without a validation mechanism would not use the Delete method. (6) Options method: Ask a supported method This method is used to query the method that is supported for the resource specified by the request URI.　　 (7) Trace method: Trace Path The Trace method is a way for the Web server to loop back the previous re

public network IP address on lb.3. The gateway address of each internal node server must be the intranet address of the scheduler lb.4. Nat mode supports the conversion of IP address and port. That is, the port that the user requests and the port of the real server can be inconsistent.(2) TUN (the scheduler will encapsulate the requested packet encryption over the IP tunnel to the backend real server, and real server will directly return the data to the client, not the scheduler).Tun modeVirtua

LVS Three modes of operation:1. Virtual server via NAT (Vs-nat)Advantage: Physical servers in a cluster can use any TCP/IP-enabled operating system, the physical server can allocate reserved private addresses for the Internet, and only the load balancer needs a legitimate IP address.Cons: Limited scalability. When the server node (normal PC server) data grows to 20 or more, the load balancer becomes the bottleneck for the entire system, because all the request packets and reply packets need to b

. Zhangwensong.IPVSSpeaking of LVS, we have to mention that Ipvs,ipvs is the core software of the LVS cluster system, which is installed on the Load Balancer and forwards the request destined for Virtual IP to the Real Server. There are three load-balancing mechanisms in IPVS, where the IP tunneling mechanism is used: ? Virtual Server via NAT ? Virtual Server via IP tunneling ? Virtual Serv

Generic Enapsulation Tunnel is a kind of network tunneling technology, it is called General tunneling technology, it can be used to package the Ethernet, IP, MPLS and other packets in the IP packet to be forwarded in the network, there is a large-scale application.The Linux system natively supports the GRE interface with the following configuration commands:IP tunnel Add gret1 mode GRE remote 45.42.104.183

1, Vs/nat (address translation Implementation of the virtual server)After the scheduler receives the request from the client, according to the scheduling algorithm, the client's request is sent to the server, the server finishes processing the request, looks at the default route (the server's default gateway needs to be set to the scheduler in NAT mode), and LB receives the response packet, modifies the source IP, The response data is then sent to the client. Principle Details:2, Vs/tun (using I

= 1 ">>/etc/sysctl.conf [root@ss-usa-odo01/etc/openvpn]# sysctl-p Net.ipv4.conf.default.accept_source_route = 1 Net.ipv4.conf.default.rp_filter = 0 Net.ipv4.ip_forward = 1 [root@ss-usa-odo01/etc/openvpn]# [root@ss-usa-odo01/etc/openvpn]# systemctl-f Enable Openvpn@server Created symlink From/etc/systemd/system/multi-user.target.wants/openvpn@server.service to/usr/lib/systemd/system/ Openvpn@.service. [root@ss-usa-odo01/etc/openvpn]# systemctl start Openvpn@server [root@ss-usa-od

true and Compression = yes will be enabled using SSH. config.ssh.dsa_authentication If set to False, this setting will not include dsaauthentication when SSH logs on to the computer. If not set, the default is true and Dsaauthentication=yes will be used with SSH. Config.ssh.extra_args This settings value was passed directly into the SSH executable. This allows-pass any arbitrary commands to does things such as reverse tunneling down into the SSH prog

server, It may also include a AAA (authenti-cation,authorization,accounting) server, typically a radius (Remote authentication dial-in User Service) server. User access terminal is to support PPP dial-up pc, laptop, mobile phone and so on. The user access mode mainly has the following two kinds: (1) The Wired dialing way: Uses the PSTN or the ISDN through the modem dial-up access NAS; (2) The wireless dialing way: The access terminal and the mobile handset are connected through the infrared or

Server) is a highly available virtual server cluster system. Founded in May 1998 by Dr. Zhangwensong, this project is one of the earliest free software projects in China.LVS is mainly used for multi-server load balancing for the network layer. In a server cluster system built by LVS, the load balancing layer of the front end is called the director server, and the server group layer that serves the backend is called real server. Get an overview of the LVS infrastructure.LVS has three modes of op

built by LVS, the load balancing layer of the front end is called the director server, and the server group layer that serves the backend is called real server.LVS has three modes of operation, namely Dr (direct Routing), TUN (tunneling IP Tunneling), NAT (network address translation). Where the Tun mode can support more real servers, but requires all server support IP

(server);(2) data sharing;shared storage;Nas:network attached Storage (file level);San:storage Area Network (Block level);Ds:distributed Storage;Data synchronization:Rsync...Type of LVS:Lvs-natLVS-DR (Direct routing)Lvs-tun (IP tunneling)Lvs-fullnat (simultaneous change of the source IP and destination IP of the request message)Note: The first three types are standard; Fullnat is the type that is added later, the kernel may not support it by default;

through NAT, even if both hosts are behind Nat. This technology is introduced in section 5.1 [Nat Prot] of rfc3027, and informal descriptions are made in Internet [Kegel], and some latest protocols are also applied, for example, in the [Teredo, Ice] Protocol. However, we should note that, as its name is, the reliability of UDP Punching Technology depends on UDP.Here we will consider two typical scenarios to introduce how applications on both sides of

Teredo and the other is 6to4, although their working methods are a bit different, the basic idea is to encapsulate IPv6 data packets into IPv4 data packets for transmission, but both ends of the communication must have the ability to package and unpackage. 9. You may already be using IPV6 Starting from Windows Vista, Microsoft has installed the IPv6 driver by default and enabled the IPv6 protocol by default, because it is automatically configured and

/04052509317298.rar 　 Another article about the hole-hitting Technology (Supplement) UDP Punching Technology relies on the public firewall and coneNAT: allow appropriate and planned end-to-end applications to penetrate through NAT, even if both hosts are behind Nat. This technology is available in section 5.1 of rfc3027 [NatProt]And informal descriptions in Internet [Kegel]. It also applies some of the latest protocols, such as [Teredo, Ice. However,W

Update Dynamic Update Auto Root Update Windows Defender Windows Media Player Internet Explorer 7.0 WGA genuine verification Windows activation Windows Help Windows Time Service Windows Error Report Windows Media Center Windows Mail Service Windows Media Digital Copyright Management (DRM) malware removal tool network connection status icon IPv6 address conversion (Teredo) customer Experience Improvement Program installer Improvement Program Device Man