Relationship between IKE and IPsec
Figure 88: Relationship between IKE and IPsec
Figure 88 illustrates the relationship between IKE and IPsec:
IKE is an application layer protocol using UDP and functions as the signaling protocol of IPsec.
IKE negotiates SAs for IPsec and delivers negotiated parameters and generated keys to IPsec.
IPsec uses the SAs set up through IKE negotiation for encryption and authentication of IP packets.