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Voluntary tunnels are transparent to the provider, but require client support.
However, neither L2F or L2TP provide confidentiality. Microsoft recommends running L2TP over IPsec to encrypt data over dial-up. Customers that use L2F or L2TP alone may not require confidentiality. Others may be satisfied with the degree of privacy offered within a single provider's network. But our engineers have yet to decide on the best approach.