gre for dummies

In actual network usage, we often run GRE + IPSEC to achieve remote access and reply from the center to the branch. This is easy to configure and provides high availability, we know that both link backup and device backup are not state backup. When a point is broken, it will take dozens of seconds or even minutes to converge, to switch to another line and rebuild the ipsec session. We can use GRE + IPSEC to

Virtual Private Network (V P N) server **v p n服务器也叫做虚拟的私有网络，它是建立在公网的基础上开辟出一条隧道，用于两主机之间的通讯** **v p n常用于集团公司中，集团下的各个子公司可以通过*隧道进行通讯，达到类似于局域网之间的通讯**Classification of V P N:v p n分了很多类，其中常见的有以下三大类： 1.gre ‘v p n ‘ 2.pptp ‘v p n‘ 3.l2tp ipsec ‘v p n‘gre ‘v p n‘ 只用于linux系统之间或者linux系统和思科的网络设备之间，并且一条gre ‘v p n‘隧道只用于两个主机之间，不可以被多个主机使用 To build GRE '

1. Brief introductionGRE (Generic Routing Encapsulation) GRE is one of the most traditional tunneling protocols, its fundamental function is to realize the tunneling function, in order to realize the inter-site network can be accessed through the internal private network.650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M02/73/24/wKioL1X2g5PgmdvjAAJ-RUxbgmE407.jpg "title=" Vpn.png "alt=" Wkiol1x2g5pgmdvjaaj-ruxbgme407.jpg "/>For example, assuming

:0Bootproto=noneOnboot=yeshwaddr=00:0c:29:08:48:63netmask=255.255.255.252ipaddr=202.100.2.2Type=ethernetUserctl=noIpv6init=noPeerdns=yes[Email protected] ~]# service network restart[[email protected] ~]# Ping 202.100.2.2PING 202.100.2.2 (202.100.2.2) bytes of data.Bytes from 202.100.2.2:icmp_seq=1 ttl=64 time=0.124 ms---202.100.2.2 ping statistics---1 packets transmitted, 1 received, 0% packet loss, time 0msRTT Min/avg/max/mdev = 0.124/0.124/0.124/0.000 ms[[email protected] ~]# Ping 192.168.10.1

=noneOnboot=yeshwaddr=00:0c:29:08:48:63netmask=255.255.255.252ipaddr=202.100.2.2Type=ethernetUserctl=noIpv6init=noPeerdns=yes[Email protected] ~]# service network restart[[email protected] ~]# Ping 202.100.2.2PING 202.100.2.2 (202.100.2.2) bytes of data.Bytes from 202.100.2.2:icmp_seq=1 ttl=64 time=0.124 ms---202.100.2.2 ping statistics---1 packets transmitted, 1 received, 0% packet loss, time 0msRTT Min/avg/max/mdev = 0.124/0.124/0.124/0.000 ms[[email protected] ~]# Ping 192.168.10.10PING 192.1

The GRE tunnel is a IP-OVER-IP tunnel, which is a generic routing encapsulation protocol that encapsulates the datagram of some network layer protocols so that the encapsulated datagrams can be transmitted in the Ipv4/ipv6 network.The tunnel is a virtual point-to-point connection that provides a path for the encapsulated data packet to be transmitted over the path and encapsulates and encapsulates the datagram at both ends of a tunnel. The message of

Creating an IP tunnel using GRE on Linux Contents [Hide]· 1 IP tunelling· 2 Starting Configuration· 3 tunnelling ObjectiveO 3.1 Create TunnelsO 3.2 Additional RoutesO 3.3 Delete Tunnels· 4 Network DiagramO 4.1 Debian Configuration· 5 References IP tunellingWe'll do IPv4 tunneling using GRE. GRE is a tunneling protocol this was original

Metering_agent_install=yconfig_neutron_l2_plugin=ml2config_neutron_ml2_type_drivers=greconfig_neutron_ml2_ Tenant_network_types=greconfig_neutron_ml2_tunnel_id_ranges=100:1000config_neutron_ovs_tenant_network_type= greconfig_neutron_ovs_tunnel_ranges=100:1000config_neutron_ovs_tunnel_if=eth1config_cinder_volumes_create=n### ##### #CONFIG_LBAAS_INSTALL =yconfig_ceilometer_install=yconfig_heat_cloudwatch_install=yconfig_heat_cfn_install =yconfig_heat_install=y(6) Run configuration filePackstack--

The db2 Tutorial we are reading is: DB2 common dummies 1000 (6 ). 149. ATAN2 ()Returns the arc tangent of the angle X and Y coordinates in radians.SELECTATAN2 (0.5, 0.9) FROMBSEMPMS;　　150. BIGINT ()Returns the 64-bit integer representation of a number or string in an integer constant.SELECTBIGINT (EMP_NO) FROMBSEMPMS;　　151. CEILING () ORCEIL ()Returns the smallest integer value greater than or equal to the parameter.SELECTCEILING (3.56) FROMBSEMPMS;SE

Linux is a lack of dummies-general Linux technology-Linux technology and application information. The following is a detailed description. Today, when talking to friends about Linux, she said that the Linux founder LT said "Gnome treats users as fools" and urges people to use KDE. I think this is the sorrow of Linux. Most computers are also potential users of Linux who are not familiar with computers. Why should they be familiar with computers, what s

Original Blu-ray Disc + mandarin dubbing + Chinese Subtitle and commentary subtitle retention pop-up menu for Dummies Tutorial I found a simple and easy-to-understand tutorial, and forwarded it so that some basic colleagues could learn about it. HereThanksThe hard work of the original author! 1. Obtain the title source.FriendWhen I went abroad for a business trip, I took a few Blu-ray discs back. In this tutorial, I used the movie "The Last

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..... The final problem is that the GUI of eclipse for Mac is slightly different from that of Linux, I created a displayimage folder under the displayimage project, and then prompted nothing to be done for "all" after building ". I am speechless. I feel that these two errors are my own C ++ IDE and I am not familiar with the basic principles. In the past, I always ignored this and did not pay attention to it. When I got to the project, I put myself in the air. Summary: The solution is sometimes

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The db2 Tutorial we are reading is: DB2 common dummies 1000 (6 ). 149. ATAN2 () Returns the arc tangent of the angle X and Y coordinates in radians. SELECTATAN2 (0.5, 0.9) FROMBSEMPMS; 　　 150. BIGINT () Returns the 64-bit integer representation of a number or string in an integer constant. SELECTBIGINT (EMP_NO) FROMBSEMPMS; 　　 151. CEILING () ORCEIL () Returns the smallest integer value greater than or equal to the parameter. SELECTCEILING (3.56) FROM

The db2 Tutorial we are reading is: DB2 common dummies: 1000 (2 ). When applying DB2, you may encounter some seemingly simple problems. For Beginners, I would like to briefly summarize them and publish them to you, hoping to help you, we also welcome everyone to discuss, develop together, and make progress together! The characters below are mainly in lower case based on DB27.X. This article does not need to be viewed by DB2 experts.All characters are

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Tags: Ar OS SP for data on art CTI ad This. chartcontrol1.series. Clear (); // clear // Obtain dataSqldb = new sqldb ();String SQL = "select t_cd, t_hg, t_as, t_pb, t_cr, t_cu, t_ni, t_zn from jcd where objectid_12 = 20 ";Datatable dt = sqldb. gettable (SQL ); // Set the title and chart typeSeries = new series ("heavy metal element", viewtype. bar ); // Import data to SeriesFor (INT I = 0; I {Seriespoint point = new seriespoint (DT. columns [I]. tostring (), convert. todouble (convert. todou

Detailed setup of samba server in linux (which can be understood by dummies) 1-Linux Enterprise Application-Linux server application information. The following is a detailed description. 1. First, we need to know what samba is designed? In my opinion, samba has three advantages: A: It is a file sharing server and a communication channel between linux and windows. B: It can be used as a print server to provide windows Remote Online printing. (Some peop