![]() In IPsec, the IKE protocol uses UDP port 500 to initiate and respond to negotiations. When AH and ESP are used together, ESP encapsulation is performed before AH encapsulation, and AH decapsulation is performed before ESP decapsulation. Therefore, ESP cannot ensure that IP headers are not tampered with.ĪH and ESP can be used independently or together. ESP in transport mode does not check the integrity of IP headers. An ESP header is appended to the standard IP header in each data packet, and the ESP Trailer and ESP Auth data fields are appended to each data packet. The authentication mechanism ensures data integrity and reliability and prevents data from being forged or tampered with during transmission.ĮSP can encrypt data in addition to authenticating the data source and checking the integrity of IP packets. The encryption mechanism ensures data confidentiality and prevents data from being intercepted during transmission. To ensure data transmission security, Authentication Header (AH) or Encapsulating Security Payload (ESP) is used to encrypt and authenticate data. ![]() After IPsec SAs are established between the communicating parties, they can transmit data over an IPsec tunnel. In this phase, the communicating parties use the Internet Key Exchange (IKE) protocol to establish IKE SAs for identity authentication and key information exchange, and then establish IPsec SAs for secure data transmission based on the IKE SAs. These elements include security protocols, data encapsulation modes, encryption and authentication algorithms, and keys used for data transmission.Īfter identifying interested traffic, the local network device initiates SA negotiation with the peer network device. An SA defines elements for secure data transmission between the communicating parties. Security association ( SA) negotiation. ![]() The traffic that needs to be transmitted through an IPsec tunnel is known as interested traffic. After a network device receives a packet, it matches the 5-tuple of the packet against the configured IPsec policy to determine whether the packet needs to be transmitted through an IPsec tunnel. ![]()
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |