Module 9. Providing Security-Enhanced Access to Remote Users

download report

Transcript Module 9. Providing Security-Enhanced Access to Remote Users

Module 9: Providing
Secure Access to Remote
Users
Overview

Identifying the Risks of Providing Remote Access

Designing Security for Dial-Up Connections

Designing Security for VPN Connections

Centralizing Remote Access Security Settings

When you provide access to your network from remote
locations, you must ensure that resources are protected
from unauthorized access and that information cannot
be intercepted during transmission. Microsoft®
Windows® 2000 includes remote access security
features that allow you to protect your network while
providing secure access for remote users. In addition,
Windows 2000 includes features that allow centralized
administration and management of remote connections.
At the end of this module, you will be able to:

Identify the risks associated with providing network
access to remote users.

Design a secure network for remote users who access
the network by using dial-up connections.

Design a secure network for remote users who access
the network by using virtual private network (VPN)
connections.

Design a secure network for remote users by
centralizing the security configuration of remote access
servers.
Identifying the Risks of Providing Remote Access
Unauthorized
Remote Access
Client
Password Cracking
Data Capture
Impersonation
Security Weaknesses
Modem
Modem
Remote Access
Server

To provide secure remote access to your organization's
network, you must manage the risks that are inherent in
remote access connections. You must identify and
address the risks so that you can permit legitimate
users to access your network while keeping out
intruders who may try to gain access to your network.
Intruders may use a variety of techniques to attempt to
break in to your network system to simply explore the
network, to steal information, or to deliberately cause
damage.
Password Cracking

Password cracking describes an attempt by an intruder
to determine the password for a known account by
using a dictionary attack. A dictionary attack is an
attempt by an unauthorized user to discover a password
by using a known user name and a list of common
words as the password.
You can defeat password cracking attempts by:

Avoiding passwords (especially administrative
passwords) that can be found in the dictionary.

Requiring that all users create passwords consisting of
uppercase and lowercase characters, numbers, and
punctuation.

Configuring the user account lockout features to disable
a user account after a specified number of unsuccessful
passwords has been attempted.
Network Data Capture

Network data captured by an intruder can be used to
obtain confidential information, such as passwords and
corporate data. Data capture, typically called network
sniffing, is achieved by using a network data analysis
tool or program, such as Network Monitor in Windows
2000 Server.

You can secure network data by:


Implementing a strong authentication method to protect
the password.
Encrypting all information that is transmitted between a
remote client and a remote access server.
Impersonation

Impersonation describes an attempt by an intruder to
convince a legitimate user to disclose information that
will allow the intruder unauthorized access to the
network. The intruder then uses the information
obtained from the legitimate user to impersonate that
user.
You can defeat impersonation intrusions by:

Implementing callback or caller ID systems to restrict
the telephone numbers that can be used to dial up your
network.

Installing a third-party security host that requires twofactor authentication, or one-time passwords. Twofactor authentication describes the use of two pieces of
information to validate a user's credentials, such as a
smart card and a password. One-time passwords are
passwords that are only valid for a brief period of time.

Configuring remote access policies to allow access only
when the user is connecting from authorized Internet
Protocol (IP) addresses and calling station identifiers.
Security Weaknesses

Administrators or users can unwittingly provide security
weaknesses in remote access connections that an
intruder can exploit.
You can reduce security weaknesses by:

Removing analog telephone lines wherever possible to prevent
users from installing unauthorized remote access connections.

Creating a centralized remote access security policy for all remote
access servers, thereby preventing inconsistent settings and
security weaknesses from being configured on an individual remote
access server.

Eliminating unnecessary resource access and dial-up permissions
for users who never have the need for remote access capabilities.

Implementing corporate policies that define the acceptable usage of
modems within the corporate network.
Designing Security for Dial-Up Connections

Authenticating and Permitting Remote Access

Authorizing Remote Access Connections

Using Remote Access Policies

Selecting a Remote Access Policy Model

Supporting Windows NT 4.0–based Remote Access
Servers

Defining Standard Dial-Up Security Settings

To provide dial-up networking capabilities to remote
users, organizations must install and maintain
communication devices, such as modems and remote
access servers. Windows 2000 provides a number of
features for securing these devices. By using these
features, you can provide secure access for dial-up
connections.
To design a secure network for dial-up connections, you
need to:

Determine the methods of authenticating and permitting
remote access.

Determine the methods for authorizing remote access
connections.

Use remote access policies for administering remote
access security.

Select a remote access policy.

Support the use of Microsoft Windows NT® version 4.0based remote access servers.

Define standard configuration settings for dial-up users.
Authenticating and Permitting Remote Access
Dial-Up
Client
Smart
Card
Reader
Smart Card
Logon
Smart
Card
Authentication
Protocol
Dial-Up Permissions
Remote Access
Account Lockout
Remote Access
Server

Authentication guarantees that the user attempting a
dial-up connection has been authorized to access the
network from a remote location. Remote access
permissions are used to specify whether the user is
permitted to use a remote access connection to access
the network. You can use Windows 2000 to configure an
appropriate authentication method and security options,
depending on the required level of security.
Authenticating Remote Access Users

There are several ways in which you can authenticate
remote access users on your network, including the use
of smart cards and remote access authentication
protocols.
Smart Cards

Smart cards provide a secure means of user
authentication and logon capabilities for dial-up users.
To be authenticated, the user inserts the smart card into
a smart card reader attached to the dial-up client.
Authentication Protocols

Windows 2000 supports several different authentication
protocols for dial-up users. You select the protocols
according to the type of operating system that the dialup client uses, and by the level of security that the dialup client requires.

The following table describes the authentication protocols
and their encryption levels
Protocol
Supports
Microsoft Challenge Handshake
Authentication Protocol (MSCHAP). Uses
challenge response authentication.
Microsoft Challenge Handshake
Authentication Protocol version 2 (MSCHAP v2).
All Windows-based operating
systems for VPN and dial-up
connections.
All Windows-based operating
systems for VPN connections.
Windows 2000 and Windows NT
operating systems for dial-up
connections.
Uses stronger data encryption keys and
different encryption keys for sending and
receiving.
CHAP
Uses industry-standard Message Digest 5
(MD5).
Extensible Authentication Protocol (EAP).
Supports a framework for highly secure
authentication plug-in components.
Password Authentication Protocol
(PAP).Uses plain text passwords.
Encryption
Level
Medium
High
All Microsoft-based operating
systems and many non-Microsoftbased operating systems.
Medium
Windows 2000 operating systems
and some non-Microsoft-based
operating systems.
All Microsoft-based operating
systems and many non-Microsoftbased operating systems
High
Low
Permitting Access to Remote Users

You can specify configuration settings for permitting
and controlling remote access. You can specify dial-up
permissions to control which users are permitted dialup access to your network. You can also use remote
access lockout to control access.
Dial-Up Permissions

In a domain environment, you can grant permissions by
modifying the domain user's account in the Dial-in tab
of the User Properties box. On a stand-alone remote
access server, you can grant permissions by modifying
the user's account on the local server.
Remote Access Account Lockout

Account lockout is a security feature that denies remote
access to a user account after a pre-configured number
of failed password attempts. Account lockout is
designed to help prevent dictionary attacks. Account
lockout is disabled by default.

Note: To configure the remote access account lockout
feature, you must change the settings in the Windows
2000 registry on the server that provides authentication.
For more information, see remote access account
lockout in the Windows 2000 Help files.
Authorizing Remote Access Connections
Approved Numbers
(425) 555-1234
(425) 555-2345
Caller’s Number
(425) 555-1234
Remote
Access
Client
Remote
Access
Server
Phone
Services

ANI/CLI

Callback

DNIS

Third-Party Security Host

If your organization requires security levels beyond the
standard authentication methods, you can use Windows
2000 remote dial-up authorization features. These
authorization features must be supported by the
telephone system that the caller uses, the telephone
system between the caller and the remote access
server, and all communications hardware used to
complete the call.
ANI/CLI

Use Automatic Number Identification/Calling Line
Identification (ANI/CLI) when you want to restrict the
telephone number that the dial-up client must use when
dialing in to the remote access server. ANI/CLI uses the
dial-up user's telephone number to authenticate the
user's connection. If the user does not call from the
specific telephone number, the connection attempt is
rejected.

Note: ANI/CLI is often referred to as caller ID security.
Callback

Use the callback feature when the telephone system does not
support ANI/CLI, or when you do not want the dial-up user to be
responsible for telephone charges. Use callback with a pre-defined
telephone number when you want to restrict the telephone number
that a dial-up client can use to connect to the remote access server.
Because callback telephone numbers can be logged, use callback
with user-specified telephone numbers when you want to identify
the telephone numbers used to make a connection. When using
callback, the remote access server disconnects the telephone call
and then calls back the remote access client on a negotiated or preassigned callback number.

Warning: Using call forwarding can circumvent callback security.
Even though the callback is sent to a pre-configured telephone
number, that telephone number can be call forwarded to an
unapproved telephone number.
DNIS

Use Dialed Number Identification Service (DNIS) when
you provide multiple telephone lines for your dial-up
users, and you want to apply remote access policies
that are based on the telephone number dialed. You can
use DNIS in situations in which you want to assign
different remote access policies to specific classes of
users. The remote access server can authorize the
connection and assigned remote access policy based
on the telephone number that the dial-up user dialed.
The telephone system must support the DNIS.
Third-Party Security Host

Use a third-party security host when you want to
augment the security that a remote access server
provides. Frequently, a security host is a device that is
located between the dial-up modem and the remote
access server.
For example, a security host can require that a dial-up
user have a security card to be authenticated. The
security card provides authentication by generating an
access code that changes each time the user connects.
Changing the access code with each use prevents an
unauthorized user from intercepting and re-using a
given code.
Using Remote Access Policies
Remote
Access
Server
Remote
Access
Policy
Remote
Access
Client

Permit Access to Specific Groups

Define Days and Times

Configure Authentication Methods

Configure Encryption Settings

Specify Maximum Session Times

Restrict Subnets

You can use remote access policies to disallow
connections that do not meet your organization's
requirements for authentication, encryption, or any
other connection conditions. Remote access policies
provide you with precise control when configuring the
security of dial-up connections, because you can use
them to specify connection authorization conditions and
restrictions.

You can use multiple remote access policies to apply
different sets of conditions to different classes of
remote access clients. You can also use remote access
policies so that different requirements can be applied to
the same remote access client, based on the parameters
of the connection attempt.
You can use remote access policies to:

Allow or deny connections if the user account belongs to a specific
group.

Define different days and times for different user accounts based
on group membership.

Configure different authentication methods for dial-up and VPN
remote access clients.

Configure different authentication or encryption settings for Pointto-Point Tunneling Protocol (PPTP) or Layer Two Tunneling
Protocol (L2TP) connections.

Configure different maximum session times for different user
accounts based on group membership.

Apply IP filters to limit the subnets that a remote user can access.
Selecting a Remote Access Policy Model

Access by User

Access by Policy in a Windows 2000 Native-mode
Domain

Access by Policy in a Windows 2000 Mixed-mode
Domain
Selecting a Remote Access Policy Model

Windows 2000 provides three different remote access
policy models for administering remote access
permissions and connection settings. Which model you
select will depend on your requirements for
administering dial-up permissions and the configuration
of your Active Directory™ directory service domain.
Access by User

In the access by user administrative model, the dial-in
permission on the user account determines remote
access permissions. You enable or disable remote
access permission on a per-user basis by setting the
user's dial-in permissions to either allow access or deny
access.
The remote access permission setting on the remote
access policy is ignored if the user's remote access
permission is set to either allow access or deny access.
Even though the permission settings in remote access
policies are ignored, you can still use remote access
policy conditions and profile properties to enforce
connection settings, such as encryption settings.
Access by Policy in a Windows 2000 Native-mode Domain

In the access by policy administrative model for a
Windows 2000 native-mode domain, you use the remote
access permission setting on the remote access policy
as the determining factor to allow or deny remote
access. You configure access by policy by setting every
user account to Control access through remote access
policy.
Access by Policy in a Windows 2000 Mixed-mode Domain

In the access by policy administrative model for a Windows 2000
mixed-mode domain, remote access permissions are granted if the
properties of a connection match a remote access policy. In a
Windows 2000-based remote access server that is a member of a
mixed-mode domain, the Control access through remote access
policy option is not available. In this case, if a connection attempt
matches the conditions of a policy, the connection is accepted. To
use this model, you must:



Set the remote access permission on every user account to Allow
access.
Delete the default remote access policy.
Create separate remote access policies and define the types of
connections that are allowed.
Supporting Windows NT 4.0–based Remote Access
Servers
Null
Session
Remote
Access Client
Windows NT 4.0
Remote Access Server
Windows 2000
Domain Controller
Everyone

Server Uses Null Session

Add Everyone to Pre-Windows
Compatible Access Security Group
Pre-Windows
Compatible Access

When your network includes Windows NT 4.0-based
remote access servers that are not backup domain
controllers, these servers will retrieve the domain user's
dial-up properties by using a NULL session to connect
to a Windows 2000 domain controller. A NULL session is
a connection that does not require a user name or
password. A NULL session requires that default
Windows 2000 permissions be reduced to allow the
Windows NT 4.0-based remote access servers to
connect. Reducing the permissions can potentially
weaken access security on the domain controller.

Note: Windows NT 4.0-based remote access servers
that are domain controllers have a local copy of the
domain database, and therefore do not connect by
using a NULL session.

To support the Windows NT 4.0-based remote access
servers, you must set the Permissions compatible with
pre-Windows 2000 server option. You can set this option
during the installation of Active Directory by using the
Active Directory Installation wizard. This option adds
the Everyone group to the local group named PreWindows 2000 Compatible Access.

Important: The Permissions compatible with preWindows 2000 server option allows full access to
certain Active Directory objects. Use this option only
after evaluating its impact on your Active Directory
security. As an alternative to this option, consider
upgrading the remote access servers to Windows 2000.
Defining Standard Dial-Up Security Settings
Connection
Manager
Package

Customized
Connection
Settings
Single Sign-On

Automatic VPN Connection

Preset Security Configuration

Disconnect Options

Connection Phonebook
Remote Access
Clients

When you want to simplify the configuration of security
settings for a large number of remote access users, you
can use the Connection Manager Administration Kit
(CMAK). You can use CMAK to define a highly secure
configuration for remote access users, and it eliminates
the need for the user to determine the appropriate
security settings for the connection. You can create
separate packages for specific types of connection,
such as dial-up user and VPN connections.

You can use CMAK to create a distributable Connection Manager
package that contains preset security options, such as:



Single Sign-On. Enables a user to log on to both an Internet service
provider (ISP) and your organization's network by using a single user
name and password.
Automatic VPN Connection. Configures the client to automatically
start a VPN connection after a dial-up connection is established.
Preset Security Configuration. Configures additional security settings,
such as the appropriate authentication protocol and encryption level
for dial-up and VPN connections.

Disconnect Options. Configures the client to disconnect from the
network after a specified amount of idle time has passed.

Connection Phonebook. Provides the client with a list of a telephone
numbers that can be used to dial in to the network.

Note: For more information on CMAK, see the Windows 2000 Help
files and the Windows 2000 Server Resource Kit.
Designing Security for VPN Connections

Identifying Benefits of VPN Connections

Selecting a Tunneling Protocol

VPN connections enable remote access clients to
securely connect to a network. VPN connections
provide secure authentication and data encryption.
Remote users can establish a VPN connection by either
dialing in to a network or by using a dedicated
connection.

When planning VPN connections for remote access
clients, you must:


Identify the benefits of using VPN connections.
Select the appropriate tunneling protocol to secure a
VPN connection.
Identifying Benefits of VPN Connections
Internal
Network
ISP
ISP
Internet
Tunnel

Outsourced Dial-Up Support

Reduced Telephone Charges

Increased Connection Speed

When a VPN connection is established, a tunnel is created between
the remote access client and the remote access server. Typically, a
remote access client dials in to a local ISP and then establishes a
VPN connection to the organization's network. The benefits of using
VPN connections established through a local ISP include:



Outsourced dial-up support. The ISP is responsible for providing and
maintaining all modems and Internet connections.
Reduced telephone charges. Because the user connects to the
Internet through a local ISP, no long-distance charges are incurred.
Increased connection speed. Technologies available to home users,
such as a digital subscriber line (DSL) and cable modems, provide
faster methods for accessing private networks.
Selecting a Tunneling Protocol
Requirements
Tunneling Protocol
PPTP
Computer Authentication
Multi-Protocol Support
L2TP/IPSec
X
X
Strong Security
X
X
Non-Windows 2000 Client Support
X
Network Address Translation Support
X
Selecting a Tunneling Protocol

PPTP and Layer Two Tunneling Protocol over Internet
Protocol Security (L2TP/IPSec) are two standard,
interoperable authentication and encryption protocols.
VPN connections use these protocols to protect data
that is transmitted over public or private networks. You
select one of these tunneling protocols based on the
type of remote access clients and servers used and the
level of security required to protect the data.
PPTP

PPTP tunnels use Microsoft Point-to-Point Encryption
(MPPE) to encrypt transmitted data. MPPE can use 40bit, 56-bit, or 128-bit encryption keys. The 40-bit key
provides compatibility with client computers that are
running earlier Microsoft operating systems than
Windows 2000.
Specify PPTP for the VPN connection when:

Data transmissions must pass through a network address
translation (NAT) server.

Remote access clients run Windows NT 4.0 or Microsoft Windows
98.

Network routers do not support L2TP/IPSec.

User-based authentication is sufficient, and you do not require the
added security of computer-based authentication.

A computer-based certificate infrastructure, such as Kerberos
version 5 or Public Key Infrastructure (PKI), does not exist.

Note: 128-bit encryption is subject to import and export laws that
can vary by country. For more information, refer to your country's
regulations on the import and distribution of encryption
technologies.
L2TP over IPSec

L2TP tunnels can use L2TP/IPSec protocols to encrypt
transmitted data. IPSec can use 40-bit Data Encryption
Standard (DES), 56-bit DES, or Triple DES (3DES)
encryption algorithms. IPSec can use Kerberos V5
authentication, public key certificates, or a secret
shared key to establish a secure connection between
two computers.
Specify L2TP/IPSec for the VPN connection when:

You need stronger security than PPTP provides.

You require the added security of computer-based
authentication.

Note: 3DES provides the strongest level of security;
however, using this encryption algorithm can increase
the processing requirements for all computers that are
configured to 3DES.
3DES is subject to the same import and export laws as
128-bit encryption. For more information, refer to your
country's regulations on the import and distribution of
encryption technologies.
 Centralizing Remote Access Security Settings

Using RADIUS

Providing Single Sign-On Capability

Centralizing Remote Access Policies

Centralizing Auditing and Accounting

Windows 2000 supports centralized security
configuration for multiple remote access servers by
using the industry-standard Remote Authentication DialIn User Service (RADIUS) protocol. RADIUS can be used
for centralizing authentication, authorization, and
accounting for dial-up and VPN connections.
RADIUS can be used in conjunction with Active
Directory to provide users with single sign-on. To
ensure consistent security configurations, you can
enforce security settings by using remote access
policies. You can centralize these policies so that they
are consistent across all remote access servers in your
organization. You can also centralize auditing and
accounting, which will allow you to monitor security and
usage information for remote access connections.
In this lesson you will learn about the following topics:

Using RADIUS

Providing single sign-on capability

Centralizing remote access policies

Centralizing auditing and accounting
Using RADIUS
Authentication,
authorization,
and accounting
Radius Server
(IAS)
Radius Server
(IAS)
Radius Proxy
Radius Client
(Remote Access
Server)
Dial-Up
Clients
Receives
authentication
requests
Forwards
authentication
requests to
appropriate
RADIUS server

You use a RADIUS server to centralize authentication,
and to allow users to connect to your organization with
an ISP that uses single sign-on. You can install and
configure a RADIUS server by installing the Internet
Authentication Service (IAS) on a remote access server.

A RADIUS environment consists of:

A RADIUS server

A RADIUS client

Dial-up client

A RADIUS proxy
A RADIUS server

A server that provides remote access user
authentication, authorization, and accounting data
maintained in a central location rather than on each
network access server. The IAS in Windows 2000 is the
Microsoft implementation of the RADIUS server.
A RADIUS client

A network access server (NAS) that receives RADIUS
authentication requests from remote access clients and
forwards them to a RADIUS server. Routing and Remote
Access in Windows 2000 can be configured as a
RADIUS client.
Dial-up client

A remote access client that uses dial-up or VPN
connections to access the network.
A RADIUS proxy

A service that forwards RADIUS authentication requests
to an appropriate RADIUS server. For example, if an ISP
is receiving authentication requests from more than one
organization, the RADIUS proxy can forward RADIUS
requests to the appropriate organization's RADIUS
server, based on the domain name that the organization
uses.
Providing Single Sign-On Capability
Dial-Up
Client
Dial-Up
Client
Remote
Access
Server
ISP’s NAS
IAS
Domain
Controller
ISP’s
RADIUS
Proxy

One of the advantages of using RADIUS for
authentication is that you can provide single sign-on
capabilities to your remote access clients. Single signon enables the remote access user to supply a single
set of credentials, which both the ISP and Active
Directory can use to authenticate the user.

The RADIUS client forwards authentication requests to
the RADIUS server. The RADIUS client can be a remote
access server connected to the network, or a remote
access server that an ISP maintains.

When implementing RADIUS to provide secure single
sign-on capabilities for remote access, you must:




Ensure that the strongest possible method of
authentication is used between a RADIUS client and a
RADIUS server.
Enable remote access account lockout to limit the
number of failed password attempts allowed before dialup access is revoked.
Ensure that your ISP uses a RADIUS proxy to forward
RADIUS authentication requests to your RADIUS
Note: Windows 2000 does not provide RADIUS proxy
service. For RADIUS proxy capabilities, you will need to
use a third-party RADIUS server.
Centralizing Remote Access Policies
Local Policy
Management
Centralized Policy
Management
IAS
Policy
PolicyA
PolicyB
Remote Access Servers
PolicyC
Remote Access Servers

You can centralize the management of remote access
policies to enforce the configuration of the required
security settings on all remote access servers.
Centralizing remote access policies eliminates the need
to configure each individual remote access server and
ensures that a single set of remote access policies is
used.
You can centralize remote access policies by:

Configuring a Windows 2000-based server as an IAS
server.

Creating the central set of policies on the IAS server.

Configuring each remote access server as a RADIUS
client to the IAS server.

The RADIUS client will be configured with the policies
on the RADIUS server; any local remote access policies
will no longer be used.

Note: You can still configure local policies on the
remote access server, when the server is configured as
a RADIUS client, however, these policies will be ignored.
Centralizing Auditing and Accounting
IAS
IAS Log
Auditing and
Accounting Information
Remote Access Servers

You can centralize auditing and accounting information
to eliminate the need to collect the information from each
remote access server. You configure centralized auditing
and accounting by configuring all of the remote access
servers to forward the information to a log file on the IAS
server. The auditing information includes information,
such as all authentications that have been accepted and
rejected. The accounting information includes usage
information, such as all logon and logoff records.

Tip: In some situations, you may not want to centralize
auditing and accounting. For example, if your remote
access servers are separated from the IAS server over a
low-bandwidth connection, you may prefer to periodically
retrieve the information from the remote access servers.
Lab A: Using RADIUS Authentication
Objectives
After completing this lab, you will be able to:

Plan security configuration for remote access by using
RADIUS.

Plan the appropriate tunneling protocol to be used for a
given scenario.
Prerequisites
Before working on this lab, you must have:

Knowledge of how RADIUS is used to authenticate dialup clients.

Knowledge of how to install a Terminal Client, IAS, and
Routing and Remote Access.
Scenario

Contoso, Ltd., a multimedia game developer located in
Melbourne, Australia, has several employees who work
remotely from client offices. Contoso, Ltd. wants these
employees to connect to the Internet by using the same
credentials that they use to access the Contoso, Ltd.
Windows 2000 network.
Exercise 1: Designing a Remote Access Solution for Contoso, Ltd.

Goal
In this exercise, you will design a remote access
solution for Contoso, Ltd. that will provide secure dialup network access for remote employees.
Scenario

Contoso, Ltd. wants to provide remote access to the corporate
network for employees who work at client sites or from home
offices. Corporate headquarters are located in Melbourne, Australia,
but employees work from client sites worldwide.

The remote access solution must meet the following requirements:




Reduce long-distance charges associated with connecting to the
corporate network by having users dial up to a local ISP.
Support both direct connected Internet users and dial-up users.
Have users connect to the Internet by providing the same
credentials that they use to connect to the corporate network.
Centralize management of remote access security in the central
Information Technology (IT) department in Melbourne.
Exercise 2: Installing the Dial-up Client

Scenario
Each computer used for remote access by a Contoso,
Ltd. employee requires a Network and Dial-up
Connection to connect to the Internet.
Goal

In this exercise, a dial-up connection will be configured
at the dial-up client computer. This dial-up connection
will connect to the IP address of the dial-up server.

Online Demo
Exercise 3: Configuring the Internet Authentication Service
Scenario

Contoso, Ltd. wants to manage all remote access to the
network from its centralized IT department in
Melbourne, Australia, thereby ensuring that a consistent
remote access policy is applied to all users who
remotely connect to the network.
Goal

In this exercise, the dial-up client computer will use
Terminal Services to configure the dial-up server as a
RADIUS client of the Melbourne IAS server.

Online Demo
Exercise 4: Installing Routing and Remote Access Service
Scenario

The ISP must configure its NASs to function as RADIUS
clients of the Melbourne RADIUS server. This
configuration is required to ensure that Contoso, Ltd.
remote users can access the Internet by using their
Contoso, Ltd. network credentials.
Goal

In this exercise, you will configure the VPN server as a
RADIUS client of the Melbourne server.

Online Simulation
Exercise 5: Authenticating a Dial-up Connection Using
RADIUS Goal

In this exercise, the remote access configuration will be
tested to ensure that the dial-up client can connect to
the VPN server by using credentials from a different
forest.

Online Demo
Exercise 6: Centralizing Management of Remote Access
Policy Scenario

Due to a computer virus attack at Contoso, Ltd.'s
headquarters, all remote access to the network must be
temporarily stopped.
Goal

In this exercise, all remote access connections will be
prevented to allow the dial-up clients to attempt to
reconnect to the VPN server.

Online Demo
Exercise 7: Disabling Routing and Remote Access Scenario

The ISP has decided to redeploy the NAS at your
location. You must disable Routing and Remote Access
for the server before taking the server offline.
Goal

In this exercise, Routing and Remote Access will be
disabled on the server.

Online Demo
Corporate Network
Remote Access Servers (10)
...
...
Traveling Sales Staff
(300 Computers)
...
Home-based Users
(200 Computers)
Review

Identifying the Risks of Providing Remote Access

Designing Security for Dial-Up Connections

Designing Security for VPN Connections

Centralizing Remote Access Security Settings