300-730 · Question #192
Two VPN clients have established SSL VPN connections to the outside interface on same Cisco Secure Firewall ASA, but they cannot communicate with each other. Which CLI command must be entered on the…
The correct answer is C. same-security-traffic permit intra-interface. The same-security-traffic permit intra-interface command enables hairpin routing on an ASA interface, allowing VPN clients connected to the same interface to communicate with each other.
Question
Options
- Ano nat-control
- Bsysopt connection permit-vpn
- Csame-security-traffic permit intra-interface
- Dsame-security-traffic permit inter-interface
How the community answered
(34 responses)- A3% (1)
- B9% (3)
- C85% (29)
- D3% (1)
Why each option
The same-security-traffic permit intra-interface command enables hairpin routing on an ASA interface, allowing VPN clients connected to the same interface to communicate with each other.
The 'no nat-control' command removes the requirement that all outbound traffic must have a NAT rule but does not enable communication between clients on the same interface.
The 'sysopt connection permit-vpn' command bypasses interface ACL checks for VPN traffic but does not address the intra-interface routing restriction that prevents same-interface VPN client communication.
When two VPN clients connect to the same ASA interface, traffic between them must re-enter and exit that same interface - a behavior blocked by default. The command 'same-security-traffic permit intra-interface' explicitly enables this intra-interface hairpin traffic, allowing the ASA to forward packets from one VPN client to another that share the same outside interface.
'same-security-traffic permit inter-interface' allows traffic to pass between different interfaces sharing the same security level, not between clients on the same interface.
Concept tested: ASA intra-interface hairpin routing for VPN clients
Source: https://www.cisco.com/c/en/us/td/docs/security/asa/asa96/configuration/general/asa-96-general-config/interface-oi.html
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