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VPN and Security

VPNs stress security by strong authentication of identity, and encrypted data transport between the nodes, for data privacy and inalterability. The following section contains information about each supported transport and authentication method.

Authentication Method

Mac OS X Server VPN uses Microsoft’s Challenge Handshake Authentication Protocol version 2 (MS-CHAPv2) for authentication. It is also the standard Windows authentication scheme for VPN. This authentication method encodes passwords when they’re sent over the network, and stores them in a scrambled form on the server offering good security during network transmission.

This authentication method is the default and available for both transport protocols described in the following section.

Mac OS X Server supports several authentication methods. Each has its own strengths and requirements. It is not possible to choose your authentication method using Server Admin. If you need to configure a different authentication scheme from the default (for example, to use RSA Security’s SecurID authentication), you’ll need to edit the VPN configuration file manually. The configuration file is located at:

/Library/Preferences/SystemConfiguration/com.apple.RemoteAccessServers.plist

Transport Protocols

You’ll be able to enable either or both of the encrypted transport protocols. Each has its own strengths and requirements.

Point to Point Tunneling Protocol (PPTP)

PPTP is the Windows standard VPN protocol. PPTP offers good encryption and supports a number of authentication schemes. It uses the user-provided password to produce an encryption key. You can also allow 40-bit (weak) security encryption in addition to the default 128-bit (strong) encryption if needed by your VPN clients.

PPTP is necessary if you have Windows or Mac OS X 10.2.x clients.

Layer Two Tunnelling Protocol, Secure Internet Protocol (L2TP/IPSec)

L2TP/IPSec uses strong IPSec encryption to “tunnel” data to and from the network nodes. It is essentially a combination of Cisco’s L2F and PPTP. IPSec requires Security Certificates from a Certificate Authority like Verisign, or a pre-defined shared secret between connecting nodes. The shared secret must be entered on the server as well as a client. It is not a password for authentication, but it is used to generate encryption keys to establish secure tunnels between nodes.

Chapter 5 VPN Service

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Apple 034-2351_Cvr VPN and Security, Authentication Method, Transport Protocols, Point to Point Tunneling Protocol Pptp
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034-2351_Cvr specifications

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