gre lessons

650) this. width = 650; "src =" http://www.bkjia.com/uploads/allimg/131227/05062443b-0.png "title =" GRE Over ipsec ).png "/> GRE Over IPSec, as the name suggests, is to establish a GRE tunnel on the IPSec interface, while an IPSec Encryption mode is tunnel mode to encrypt the network segment to the network segment ), this is the

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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

Nbsp; 1. first, we need to load the kernel module ip_gre.o. The GRE module in the previous versions of kernal is ip_gre.o, and RHEL5 called ip_gre.komodprobe-l | grepip_gre.ko above this command is to look at this module insmode/lib/modules/2.4.20-8/kernel/net/ipv4/I 1. first, load the kernel module ip_gre.o. The GRE module in the previous versions of kernal is ip_gre.o, and RHEL5 is called ip_gre.ko.Modpro

Loading GRE ModulesModprobe Ip_greCreate a tunnel named officeIP tunnel addoffice mode GRE remote 111.206.164.122 local 111.206.0.88 TTL 255IP Link Set officeupAdd an IP address for tunnelIP Add add10.100.100.1/30 Dev OfficeCreate a routing table with a table name of 136IP route add default via 103.246.132.61 table 136To create a policy that specifies the route table 136 when the local source IP is 192.168.

1.IP descriptionVM1 192.168.2.2VM2 192.168.2.32. Start the POX controller on the VM1CD pox./pox.py forwarding.l2_learning3. Start the mininet on VM1, use the simplest topology, connect to the Pox controllersudo mn--controller=remote,ip=192.168.2.24. Start the mininet on vm2, use the simplest topology, connect to the Pox controllersudo mn--controller=remote,ip=192.168.2.25. Modify the IP of H1, H2 on VM2Mininet> xterm H1 H2Terminal Input in H1Ifconfig H1-eth0 inet 10.0.0.3Terminal input in H2Ifco

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

Release date:Updated on: Affected Systems:Linux kernelDescription:--------------------------------------------------------------------------------Bugtraq id: 47852Cve id: CVE-2011-1767 Linux Kernel is the Kernel used by open source Linux. The Linux Kernel "ip gre" module has a denial of service vulnerability of NULL pointer reference. A local attacker can exploit this vulnerability to cause a Kernel crash. This vulnerability can also cause DoS atta

650) this. width = 650; "src =" http://www.bkjia.com/uploads/allimg/131227/044P51D2-0.png "title =" .png "/> Basic configurations: 1) The loopback ports of R1 and R2 are 192.168.1.1/24 and 192.168.2.1/24, respectively. 2) the IP addresses at both ends of the link use the vro ID, for example, s0/0: 192.168.12.1 of R1. Q1: What is tunnel? Q2: How to Create tunnel in GRE? Q3: tunnel details. Answer1: Tunnel is a virtual interface similar to the loopb

Article Title: Configure ipip and gre tunnels in Linux. Linux is a technology channel of the IT lab in China. Including desktop applications, Linux system management, kernel research, embedded systems, open-source, and other basic categories. Create a ifcfg-tunl1 file under/etc/sysconfig/network-scripts The content is as follows: DEVICE = tunl1 TYPE = IPIP PEER_OUTER_IPADDR = 219.216.98.110 MY_INNER_IPADDR = 10.0.1.1/24 Configurin

VPN technology: GREGRE is a lightweight tunnel protocol developed by Cisco. It can encapsulate various network layer protocols into an IP package and create a virtual point-to-point link through a tunnel, connect the two routers for data transmission. GRE itself is not encrypted, but IPSEC can be used to protect data in GRE, that is, GRE Over IPSEC. Our commonly

Learning programming lessons from watching videos and learning programming lessons from videos First of all, I have been studying programming for half a year. Now I am a senior graduate. I graduated in February. My major is in the mechanical and electrical fields, which is almost irrelevant to the IT industry, so I have no basic learning programming. Watch video learning I am familiar with python progr