This agreement on keys and encryption methods must also be implemented safely. This is why IKE consists of two phases. The first phase lays the groundwork for the second. Both IKEv1 and IKEv2 are supported in the security gateways of the R71 and later versions. Since the IKE negotiations must be protected, any negotiations on IKE begin in agreement with the two peers for a common IKE directive. This directive specifies the security parameters used to protect future IKE negotiations and specifies how peers are authenticated. The local keyword is required for the use of the ipsec-profile set command and set tunnel-ipsec interface commands below in this procedure. The IKE consists of two phases. In Phase 1, IKE creates a secure authenticated channel between the two IKE peers. This is done with the Diffie-Hellman Key Memorandum of Understanding. IKE supports several authentication methods as part of the Phase 1 exchange.
Methods include: Phase II of IKE is encrypted according to the keys and methods agreed upon during Phase I of IKE. The turnkey hardware that was replaced during Phase II of the IKE is used to create the IPSec key. The result of Phase II is the IPSec Security Association. IPSec SA is an agreement on IPSec`s keys and methods, which is why IPSec is carried out according to the keys and methods agreed during Phase II of IKE. The controls for the set service-gre interface and set interface service-ipsec are only available on the Cisco CRS router – Sets the interface instances when IKE negotiates for IPSec security links for traffic that is used remotely and ends. The tunnel-ipsec interface set command is only available if you`ve already selected the local keyword – sets the interface instance when IKE negotiates for IPSec (SAs) service assignments for traffic that reports or stops locally, and the local arrival point is the IKE answering machine. The objective of the Internet Key Exchange (IKE) is for both parties to independently produce the same symmetrical key. This key then encrypts and decrypts the regular IP packages used for mass data transmission between VPN peers. IKE creates the VPN tunnel by authenticating both parties and reaching agreement on encryption and integrity methods. The result of an IKE negotiation is a security association (SA). The IETF ipsecme working group has standardised a number of extensions to modernize the IKEv2 protocol and better adapt it to high-volume production environments. Among these extensions include: In terms of performance, hellman Key diffie generation is slow and heavy.
The result of this phase is IKE SA, an agreement on the keys and methods for IKE Phase II. Figure 2-1 shows the process that takes place during Phase I of IKE, but does not necessarily reflect the actual order of events. The calculation of the Diffie Hellman key (also known as the exponential key agreement) is based on the mathematical groups of Diffie Hellman (DH). A security device supports these DH groups during both IKE phases. Here`s how to set up a service ipsec interface with a dynamic profile: the SHA-2 family and the SHA-1 family (HMAC variant) – Secure Hash Algorithm (SHA) 1 and 2. Sha-1 and SHA-2 are hashal algorithms used to authenticate packet data and verify the integrity verification mechanisms of the IKE protocol. HMAC is a variant that offers an additional level of ha hashing.