A network administrator is troubleshooting an issue with Phase 2 of an IPSec VPN tunnel The administrator determines that the lifetime needs to be changed to match the peer. Where should this change be made?

The IPSec Crypto profile defines the set of security protocols and algorithms used to protect data traffic in an IPSec VPN tunnel, which corresponds to Phase 2 of the IKE/IPSec negotiation. This profile includes parameters such as the protocol (ESP or AH), encryption and authentication algorithms, Diffie-Hellman (DH) group for Perfect Forward Secrecy (PFS), and the Security Association (SA) lifetime. A mismatch in the Phase 2 lifetime between peers is a common cause of tunnel negotiation failure, and this value is configured directly within the IPSec Crypto profile on a Palo Alto Networks firewall.

A. IPSec Tunnel settings: This configuration object binds the IKE Gateway and IPSec Crypto profile to a tunnel interface but does not contain the lifetime parameter itself.
B. IKE Crypto profile: This profile defines the parameters for IKE Phase 1, such as the IKE SA lifetime, not the IPSec SA (Phase 2) lifetime.
D. IKE Gateway profile: This defines the peer's identity and connection parameters for establishing Phase 1, linking to the IKE Crypto profile, not Phase 2 settings.

1. Palo Alto Networks PAN-OS® Administrator’s Guide 10.2: In the section describing how to set up an IPSec VPN

the configuration of the IPSec Crypto profile is detailed. It explicitly lists "Lifetime" as a configurable parameter for the Phase 2 Security Association.

Reference: Network > Network Profiles > IPSec Crypto > Add IPSec Crypto Profile. The dialog box shows fields for "IPSec Protocol

" "Encryption

" "Authentication

" "DH Group

" and "Lifetime." This directly confirms the lifetime is a Phase 2 parameter set in this profile.

2. Palo Alto Networks PAN-OS® Administrator’s Guide 10.2: The guide explains the role of each component in an IPSec VPN. It differentiates the IKE Crypto profile (Phase 1) from the IPSec Crypto profile (Phase 2).

Reference: Section "Set Up an IPSec VPN

" Step 5: "Add an IPSec Crypto profile to specify the protocols and algorithms for authenticating and encrypting traffic in the IPSec security association (Phase 2)."

3. Palo Alto Networks PAN-OS® Administrator’s Guide 10.2: The guide clarifies the function of the IKE Crypto profile

confirming it is for Phase 1.

Reference: Section "Set Up an IPSec VPN

" Step 4: "Add an IKE Crypto profile to specify the protocols and algorithms for authentication

encryption

and key exchange in the IKE security association (Phase 1)."