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For the LANCOM Advanced VPN Client for Windows, the LocalNet attack can be prevented by enabling the “Full Local Network Enclosure Mode” option. As a result, all network traffic will be sent through the tunnel.
Alternatively, the integrated Advanced VPN Client Firewall can be configured such that only VPN traffic is allowed outside the tunnel (using the “Permit IPsec protocol” firewall option), with dedicated exceptions for, e.g., the local network printer.
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