by admin | May 3, 2021 | Cisco, Security, VPN
IPsec VPN Compression Overview Search for: Caveats of using encryption and compression together Higher-layer data encryption reduces the effectiveness of lower-layer data compression Higher-layer data encryption IPsec VPN with ESP operates in layer 3 The IPsec VPN...
by admin | May 3, 2021 | Cisco, Security, VPN
IPsec VPN SA Lifetime And DPD Search for: (1) IPsec VPN SA lifetime IKE SA & IPsec SA both have independent lifetime values Lifetime values are negotiated separately IKE SA lifetime during IKE Phase 1 negotiation IPsec SA lifetime during IKE Phase 2 negotiation If...
by admin | May 1, 2021 | Cisco, Security, VPN
IKE Keying And Authentication Search for: (1) IKE Phase 1 Main Mode Keying 3rd message (from initiator), and 4th message (from responder) contains: Nonce “N = Number” “once = used only once” Randomly generated huge number, typically used in key generation DH public...
by admin | Feb 27, 2021 | Cisco, Security, VPN
ISAKMP IKE Phase 2 Details Search for: (1) ISAKMP/IKE Phase 2 Phase 2 Negotiates IPSec SA parameters protected by an existing IKE SA Establishes IPSec security associations Set up 2 unidirectional (1-way) secure tunnels for data connection Periodically renegotiates...
by admin | Feb 27, 2021 | Cisco, Security, VPN
ISAKMP IKE Phase 1 Details Search for: (1) ISAKMP and IKE Overview ISAKMP and IKE background Manual keying presents many challenges and disadvantages November 1998, IETF specified a framework to address these issues ISAKMP was officially standardised by IETF in RFC...
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