During a configuration recovery exercise, engineers discover that a tunnel negotiates IKE successfully while local and remote protected-subnet selectors no longer agree. What specific failure risk follows if the underlying fault remains?
The IKE control channel may be healthy while the required data-plane IPsec SA is absent. Phase 2 selectors and proposals define which traffic the negotiated IPsec data SA protects. The described exposure follows from leaving the Phase 2 selector mismatch dependency unresolved.
It would be a concern if overlapping VPN subnets were misconfigured. Here Phase 2 selectors and proposals define which traffic the negotiated IPsec data SA protects. The selected alternative does not follow from the observed fault.
That risk is associated with IPsec tunnel diagnostics and logging rather than the failing Phase 2 selector mismatch dependency. Successful VPN service requires IKE control-plane establishment and verified encrypted bidirectional data-plane traffic. The present scenario establishes a different causal exposure.
It would be a concern if redundant tunnel preferences were misconfigured. Here Phase 2 selectors and proposals define which traffic the negotiated IPsec data SA protects. The selected alternative does not follow from the observed fault.
A post-incident review at a distributed engineering campus identifies that IKE Phase 1 is up but the IPsec child SA cannot form after one site's subnet was renumbered. The same control is still uncorrected. Which exposure should the risk register record?
The IKE control channel may be healthy while the required data-plane IPsec SA is absent. Phase 2 selectors and proposals define which traffic the negotiated IPsec data SA protects. The described exposure follows from leaving the Phase 2 selector mismatch dependency unresolved.
This describes a separate redundant tunnel preferences failure. Redundant VPNs need routing or SD-WAN policy that distinguishes preferred and alternate protected paths. It does not identify the most direct consequence of leaving Phase 2 selector mismatch unresolved.
That risk is associated with IPsec route to remote subnet rather than the failing Phase 2 selector mismatch dependency. Route-based IPsec requires normal forwarding policy to select the tunnel for protected destinations. The present scenario establishes a different causal exposure.
This describes a separate overlapping VPN subnets failure. IPsec routing relies on distinct prefixes unless a deliberate translation design separates overlapping address spaces. It does not identify the most direct consequence of leaving Phase 2 selector mismatch unresolved.
At a financial services branch running FortiOS 7.6, an IPsec tunnel status is up but local packets to the remote branch use the WAN default route instead. Which configuration or investigative change most directly resolves this issue?
Configure a route toward the protected remote prefix via the correct IPsec tunnel interface. Route-based IPsec requires normal forwarding policy to select the tunnel for protected destinations. This corrects the FortiGate behavior described by the specific IPsec route to remote subnet fault.
This correction targets IKE version mismatch. Peers must agree on the IKE protocol and associated negotiation capabilities. It does not repair the stated IPsec route to remote subnet condition: an IPsec tunnel status is up but local packets to the remote branch use the WAN default route instead.
Changing this could help when the fault is redundant tunnel preferences, because redundant VPNs need routing or SD-WAN policy that distinguishes preferred and alternate protected paths. Here the evidence instead identifies IPsec route to remote subnet; the recommended correction addresses that dependency.
The proposed setting concerns VPN identity mismatch behind NAT, not the actual source of failure. Route-based IPsec requires normal forwarding policy to select the tunnel for protected destinations. It would leave the cited symptom unresolved.
During a weekend failover rehearsal, after adding an IPsec interface the forwarding table still lacks a route to the peer LAN. What should the FortiGate administrator change to meet the stated requirement?
Configure a route toward the protected remote prefix via the correct IPsec tunnel interface. Route-based IPsec requires normal forwarding policy to select the tunnel for protected destinations. This corrects the FortiGate behavior described by the specific IPsec route to remote subnet fault.
The proposed setting concerns Phase 2 selector mismatch, not the actual source of failure. Route-based IPsec requires normal forwarding policy to select the tunnel for protected destinations. It would leave the cited symptom unresolved.
This correction targets wrong remote gateway identity. Phase 1 needs a reachable and correctly identified peer, whether statically addressed or dynamically discovered. It does not repair the stated IPsec route to remote subnet condition: after adding an IPsec interface the forwarding table still lacks a route to the peer LAN.
Changing this could help when the fault is PFS group mismatch, because pFS contributes fresh key material to child-SA negotiation and requires peer agreement. Here the evidence instead identifies IPsec route to remote subnet; the recommended correction addresses that dependency.
A regional manufacturing group discovers a FortiGate control gap during a configuration recovery exercise: an IPsec tunnel status is up but local packets to the remote branch use the WAN default route instead; additionally, after adding an IPsec interface the forwarding table still lacks a route to the peer LAN. Which targeted correction should the team implement?
Configure a route toward the protected remote prefix via the correct IPsec tunnel interface. Route-based IPsec requires normal forwarding policy to select the tunnel for protected destinations. This corrects the FortiGate behavior described by the specific IPsec route to remote subnet fault.
The proposed setting concerns IPsec inter-site firewall policies, not the actual source of failure. Route-based IPsec requires normal forwarding policy to select the tunnel for protected destinations. It would leave the cited symptom unresolved.
Changing this could help when the fault is IKE version mismatch, because peers must agree on the IKE protocol and associated negotiation capabilities. Here the evidence instead identifies IPsec route to remote subnet; the recommended correction addresses that dependency.
The proposed setting concerns IPsec MTU and MSS fragmentation, not the actual source of failure. Route-based IPsec requires normal forwarding policy to select the tunnel for protected destinations. It would leave the cited symptom unresolved.
The supply-chain company team is verifying its fix for an incident where an IPsec tunnel status is up but local packets to the remote branch use the WAN default route instead. Which specific observation most convincingly demonstrates the required FortiGate behavior?
A routing lookup for the destination LAN selects the IPsec tunnel and packet counters increase during testing. Route-based IPsec requires normal forwarding policy to select the tunnel for protected destinations. This is directly observable evidence for the IPsec route to remote subnet requirement, rather than a generic appliance-health indicator.
That observation is a useful test for wrong remote gateway identity, but not decisive proof of IPsec route to remote subnet. Phase 1 needs a reachable and correctly identified peer, whether statically addressed or dynamically discovered. The recorded acceptance check must demonstrate the actual requirement.
This verifies a different control: VPN identity mismatch behind NAT. Route-based IPsec requires normal forwarding policy to select the tunnel for protected destinations. The stated incident requires evidence of its own packet, identity or policy behavior.
That observation is a useful test for IKE version mismatch, but not decisive proof of IPsec route to remote subnet. Peers must agree on the IKE protocol and associated negotiation capabilities. The recorded acceptance check must demonstrate the actual requirement.
After an incident-response triage, administrators correct a problem where after adding an IPsec interface the forwarding table still lacks a route to the peer LAN. Which test result should their acceptance record contain?
A routing lookup for the destination LAN selects the IPsec tunnel and packet counters increase during testing. Route-based IPsec requires normal forwarding policy to select the tunnel for protected destinations. This is directly observable evidence for the IPsec route to remote subnet requirement, rather than a generic appliance-health indicator.
This verifies a different control: DPD peer liveness. Route-based IPsec requires normal forwarding policy to select the tunnel for protected destinations. The stated incident requires evidence of its own packet, identity or policy behavior.
A result about backup tunnel health validation can be true while the IPsec route to remote subnet defect persists. Redundancy is useful only when both candidate VPN paths can negotiate and forward traffic. It does not validate the tested dependency.
That observation is a useful test for tunnel phase2 rekey mismatch, but not decisive proof of IPsec route to remote subnet. Phase 2 rekeys must negotiate compatible protection parameters while existing SAs expire. The recorded acceptance check must demonstrate the actual requirement.
An auditor reviewing a municipal network deployment finds that an IPsec tunnel status is up but local packets to the remote branch use the WAN default route instead. The team claims this is resolved; which concrete evidence would substantiate that claim?
A routing lookup for the destination LAN selects the IPsec tunnel and packet counters increase during testing. Route-based IPsec requires normal forwarding policy to select the tunnel for protected destinations. This is directly observable evidence for the IPsec route to remote subnet requirement, rather than a generic appliance-health indicator.
That observation is a useful test for IPsec MTU and MSS fragmentation, but not decisive proof of IPsec route to remote subnet. IPsec overhead reduces effective payload size and requires correct MTU or MSS handling on constrained paths. The recorded acceptance check must demonstrate the actual requirement.
This verifies a different control: certificate-based VPN peer trust. Route-based IPsec requires normal forwarding policy to select the tunnel for protected destinations. The stated incident requires evidence of its own packet, identity or policy behavior.
A result about IPsec inter-site firewall policies can be true while the IPsec route to remote subnet defect persists. IPsec negotiation and FortiGate firewall authorization operate at separate layers. It does not validate the tested dependency.
If a managed services provider leaves the following FortiGate issue unresolved—an IPsec tunnel status is up but local packets to the remote branch use the WAN default route instead—what is the most direct operational or security consequence?
Protected packets may bypass the tunnel or be dropped for lack of an appropriate route. Route-based IPsec requires normal forwarding policy to select the tunnel for protected destinations. The described exposure follows from leaving the IPsec route to remote subnet dependency unresolved.
That risk is associated with backup tunnel health validation rather than the failing IPsec route to remote subnet dependency. Redundancy is useful only when both candidate VPN paths can negotiate and forward traffic. The present scenario establishes a different causal exposure.
This describes a separate IPsec inter-site firewall policies failure. IPsec negotiation and FortiGate firewall authorization operate at separate layers. It does not identify the most direct consequence of leaving IPsec route to remote subnet unresolved.
That risk is associated with VPN identity mismatch behind NAT rather than the failing IPsec route to remote subnet dependency. IKE identity matching is distinct from outer IP addressing and affects dynamic-peer authentication. The present scenario establishes a different causal exposure.
During a segmentation review, engineers discover that after adding an IPsec interface the forwarding table still lacks a route to the peer LAN. What specific failure risk follows if the underlying fault remains?
Protected packets may bypass the tunnel or be dropped for lack of an appropriate route. Route-based IPsec requires normal forwarding policy to select the tunnel for protected destinations. The described exposure follows from leaving the IPsec route to remote subnet dependency unresolved.
It would be a concern if preshared key disagreement were misconfigured. Here Route-based IPsec requires normal forwarding policy to select the tunnel for protected destinations. The selected alternative does not follow from the observed fault.
This describes a separate IKE version mismatch failure. Peers must agree on the IKE protocol and associated negotiation capabilities. It does not identify the most direct consequence of leaving IPsec route to remote subnet unresolved.
It would be a concern if overlapping VPN subnets were misconfigured. Here Route-based IPsec requires normal forwarding policy to select the tunnel for protected destinations. The selected alternative does not follow from the observed fault.
A post-incident review at a research institute identifies that an IPsec tunnel status is up but local packets to the remote branch use the WAN default route instead. The same control is still uncorrected. Which exposure should the risk register record?
Protected packets may bypass the tunnel or be dropped for lack of an appropriate route. Route-based IPsec requires normal forwarding policy to select the tunnel for protected destinations. The described exposure follows from leaving the IPsec route to remote subnet dependency unresolved.
This describes a separate VPN identity mismatch behind NAT failure. IKE identity matching is distinct from outer IP addressing and affects dynamic-peer authentication. It does not identify the most direct consequence of leaving IPsec route to remote subnet unresolved.
That risk is associated with wrong remote gateway identity rather than the failing IPsec route to remote subnet dependency. Phase 1 needs a reachable and correctly identified peer, whether statically addressed or dynamically discovered. The present scenario establishes a different causal exposure.
It would be a concern if overlapping VPN subnets were misconfigured. Here Route-based IPsec requires normal forwarding policy to select the tunnel for protected destinations. The selected alternative does not follow from the observed fault.
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