openswan ipsec

1, UnderstandIPSecSecurity Policy IPSec and Internet Protocol Security are an open standard in the network security industry. By using the encrypted security service, the confidentiality and security of network communication are ensured. IPSec works at the network layer and is transparent to users and applications. It can provide restricted access to servers and customize security configurations.

IP Security encryption-IPSec uses network communication encryption technology. Although the header and tail information of a data packet cannot be encrypted, such as the source/destination IP address, port number, and CRC Check value, data packets can be encrypted. Because the encryption process occurs on the IP layer, you can perform security encryption on the network protocol without changing protocols such as POP/WWW. At the same time, it can also

Set up an IPSec VPN for Strongswan in CentOS 6.3 I. Software Description IPsec is a type of Virtual Private Network (VPN) used to establish an encrypted tunnel between the server and the client and transmit sensitive data. It consists of two phases: the first phase (Phrase 1, ph1), the exchange key to establish a connection, the use of Internet Key Exchange (ike) protocol; the second phase (Phrase 2, ph2 ),

Application Introduction IPSec VPN can be used to establish a secure tunnel between two sites, often used for network docking of Enterprise Headquarters and branch offices. This paper takes a company Beijing headquarters and Guangzhou branch need to build a safe tunnel as an example, introduce the setting method of using WVR series Enterprise wireless router to build IPSec VPN. Note

Introduction to Web Security--the process of loading and unpacking ESP packets in IPSec transfer modeOne, IPsec(a) introduction Internet Security Protocol ( English:Internet Protocol Security, abbreviated to IPSEC), is to protect the IP Protocol's Network transport Protocol family (a collection of interrelated protocols) by encrypting and authenticating the IP Pr

The windows2003 system has a weak firewall capability, and the key is that it cannot be configured with commands, which can cause a lot of work on a bulk deployment, so access control using IPSecUnder Windows2003, you can operate with the command netsh ipsecSyntax for commands: http://technet.microsoft.com/zh-cn/library/cc739550 (v=ws.10). aspx 1. Delete all security policiesnetsh ipsec static del all 2. Establish strategy testnetsh

Tags: mode environment Port Mob cookie inter between features creatIKE (Internet Key Exchange)-Internet Key exchangeIn order to introduce the FLEXVPN based on IKEV2, this paper introduces IKEV1 and IKEv2 differences.Before starting the introduction, take a look at the application and workflow of IKEV1 in IPSec VPN.In IPSec VPN, IKE is used to negotiate IPSec SAs.

Data communication and network note-IPSec1. IP layer security: IPSecIP layer security (IPsec) is a set of protocols designed by the Internet Engineering Task Group (IETF) to provide security for IP layer groups. IPsec helpGenerate identified and Secure IP layer groups, such:1. Two MethodsIPSec runs in two different modes: Transmission Mode and tunnel mode, as shown in:Transmission ModeIn the transmission mo

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 +

In the previous blog, the small series has used the GRE protocol to achieve the VPN technology, then in this blog, the small part of the use of IPSec protocol to achieve VPN, although the theoretical knowledge is somewhat abstract, but in helping us understand the technology is still very necessary, then now began to theory IPSec (IP Security) is a group of open protocols, the specific communication betwe

This site has previously shown us the method of segmenting a router into eight virtual routers using virtual Routing and forwarding (VRF, VM forwarding) through a scene example. I showed you how to configure VRF, and in this article we continue to use this scenario and, through IPSec configuration, replicate the exact topology and address to eight experimental environments. The entire environment can proceed smoothly, first requires the virtual route

encrypts the data according to certain encryption algorithms, the peer that receives the data must use the same algorithm to restore the data. The IPSec tunnel mode of the Security Router also provides the function of hiding the internal network topology. The security router re-encapsulates all the IP packets to be sent, encapsulate the IP addresses of the Source and Destination gateways in the original IP address package. When the destination router

//Prohibit Win7 connection Public Static voidBannedwinruncmd () {stringstr =Console.ReadLine (); System.Diagnostics.Process P=NewSystem.Diagnostics.Process (); p.StartInfo.FileName="Cmd.exe"; P.startinfo.useshellexecute=false;//whether to start with the operating system shellP.startinfo.redirectstandardinput =true;//accept input from the calling programP.startinfo.redirectstandardoutput =true;//get output information from the calling programP.startinfo.redirectstandarderror =true;//REDIR

IPSec (IP Security) is the most common protocol used to implement VPN functionality. VPN can be realized by the corresponding tunneling technology. There are two modes of IPSec: Tunnel mode and transport mode. IPSec is not a separate protocol, it gives a set of architectures applied to the security of network data on the IP layer. The architecture includes the A

communication and encapsulates it in the IP header sent across the company's IP network or public IP network (such as the Internet. Ii. L2TP Layer 2 Tunneling Protocol (L2TP) is a later version of PPTP developed by IETF Based on L2F (Cisco's L2 forwarding protocol. It is an industrial standard Internet tunnel protocol that provides encapsulation for a Point-to-Point Protocol (PPP) framework that spans data packets. Both PPTP and L2TP use the PPP protocol to encapsulate data, and then add additi

/IP-based data network to implement secure data transmission from a remote client to a dedicated Enterprise Server. PPTP supports creating on-demand, multi-protocol, and virtual private networks through public networks (such as the Internet. PPTP allows encrypted IP communication.Encapsulate the IP address header. Ii. L2TP Layer 2 Tunneling Protocol (L2TP) is a later version of PPTP developed by IETF Based on l2f (Cisco's L2 forwarding protocol. It is an industrial standard Internet tunnel proto

As a new VPN technology, ssl vpn gateway has its own unique characteristics and has its own merits. Ssl vpn is suitable for mobile users' remote access (Client-Site), while IPSec VPN has inherent advantages in Site-Site VPN connections. These two products will coexist in the VPN market for a long time, with complementary advantages. In terms of product performance, the two products have the following differences: 1.

Caution Against Ping with IPSec security policy The use of IPSec security policy "ping" is a common method, after a simple step of IPSec security policy configuration, you can achieve the effect of ping. This method is relatively simple to configure, and IPSec security policy is a feature that is built into the Window

It is widely used in NAT and IPSec technologies. But in essence, there is a conflict between the two. 1. From the IPsec perspective, IPSec needs to ensure data security, so it encrypts and verifies data. 2. From the perspective of NAT, IP addresses are bound to be modified to complete address translation. IPSec provide

Five.common failure Debug Commands[H3c]disike SAAfter the configuration is complete, users who find network A and network B cannot access each other.Possible causes1. Traffic does not match ACL rules Execute the command display ACL Acl-number to see if the traffic matches the IPSec ACL rules. 2. Inconsistent IKE security offer configuration for both devices Execute the command display IKE proposal on NGFW_A and Ngfw_b respective