Radius support in cisco ios software

radius support in cisco ios software

The previous article presented the basic theory behind the Authentication Proxy (Auth-proxy) functionality on Cisco IOS Software. Cisco supports RADIUS under its authentication, authorization, and accounting (AAA) security paradigm. RADIUS can be used with other AAA. Authentication is the process by which the RADIUS server verifies the user requesting access before it is granted, whereas Authorization deals. TEAMVIEWER MANUAL Сообщаю Для вас, что.

The AAA accounting feature enables you to track the services users are accessing and the amount of network resources they are consuming. The order in which the hosts are entered is the order in which they are attempted. Use the ip tcp synwait-time command to set the number of seconds that the NAS waits before trying to connect to the next host on the list; the default is 30 seconds.

To control whether user responses to Access-Challenge packets are echoed to the screen, you can configure the Prompt attribute in the user profile on the RADIUS server. This attribute is included only in Access-Challenge packets. To allow user responses to echo, set the attribute to Echo. If the Prompt attribute is not included in the user profile, responses are echoed by default.

This attribute overrides the behavior of the radius-server challenge-noecho command configured on the access server. For example, if the access server is configured to suppress echoing, but the individual user profile allows echoing, the user responses are echoed. The IETF standard specifies a method for communicating vendor-specific information between the network access server and the RADIUS server by using the vendor-specific attribute attribute Vendor-specific attributes VSAs allow vendors to support their own extended attributes not suitable for general use.

Note that any AV pair can be made optional:. The following example shows how to cause a user logging in from a network access server to have immediate access to EXEC commands:. To have the Cisco device or access server query the RADIUS server for static routes and IP pool definitions when the device starts up, use the radius-server configure-nas command.

Because the radius-server configure-nas command is performed when the Cisco devcie starts up, it does not take effect until you enter a copy system:running-config nvram:startup-config command. Vendor-proprietary attributes are not supported unless you use the radius-server host non-standard command. Enter your password if prompted. Sometimes PPP or login authentication occurs on an interface that is different from the interface on which the call itself comes in. For example, in a V. The upper 16 bits of the NAS-Port attribute display the type and number of the controlling interface; the lower 16 bits indicate the interface undergoing authentication.

The radius-server attribute nas-port format command replaces the radius-server extended-portnames command and the radius-server attribute nas-port extended command. Because the radius-server configure-nas command is used when the Cisco device starts up, it does not take effect until you issue a copy system:running-config nvram:startup-config command. Expands the size of the NAS-Port attribute from 16 to 32 bits to display extended interface information. VSAs can be turned on by entering the radius-server vsa send command.

The port information in this attribute is provided and configured using the aaa nas port extended command. If you do not want this information to be sent, you can suppress it by using the no radius-server attribute nas-port command. After this command is configured, the standard NAS-Port attribute is no longer sent.

Large-scale dial-out eliminates the need to configure dialer maps on every NAS for every destination. Instead, you can create remote site profiles that contain outgoing call attributes on the AAA server. The profile is downloaded by the NAS when packet traffic requires a call to be placed to a remote site. The format for composing the username attribute is the IP address plus the configured suffix.

Enables the download static route feature and sets the amount of time in minutes between downloads. Allows a dialer to access the AAA server for dialing information and specifies a suffix and nondefault password for authentication. The aaa authentication login use-radius group radius local command configures the device to use RADIUS for authentication at the login prompt. The aaa authorization network default group radius command sets RADIUS for network authorization, address assignment, and access lists.

The radius-server key command defines the shared secret text string between the network access server and the RADIUS server host. The aaa authorization network default group radius local command is used to assign an address and other network parameters to the RADIUS user. The aaa accounting network default start-stop group radius command tracks PPP usage.

The configure-nas command defines that the Cisco device or access server queries the RADIUS server for static routes and IP pool definitions when the device first starts up. The aaa authorization network default group radius local command assigns an address and other network parameters to the RADIUS user.

Two different host entries on the same RADIUS server are configured for the same services—authentication and accounting. The second host entry configured acts as failover backup to the first one. The local name is not defined, so the hostname used is the local name. Because the L2TP tunnel password is not defined, the username password is used. Dial Technologies Configuration Guide.

Wide-Area Networking Configuration Guide. RFC The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies.

Access to most tools on the Cisco Support and Documentation website requires a Cisco. The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train.

Unless noted otherwise, subsequent releases of that software release train also support that feature. The following commands were introduced or modified: show aaa servers , show radius statistics. Skip to content Skip to search Skip to footer.

Book Contents Book Contents. Find Matches in This Book. Log in to Save Content. PDF - Complete Book 3. Updated: January 31, The challenge collects additional data from the user. Table 1. Note This is the only call type available for channel-associated signaling CAS. Table 2.

Modem Management String Command Argument min-speed to , any max-speed to , any modulation K56Flex, v22bis, v32bis, v34, v90, any error-correction lapm, mnp4 compression mnp5, v42bis When the modem management string is received from the RADIUS server in the form of a VSA, the information is passed to the Cisco software and applied on a per-call basis.

Note Before you can perform subsequent authentication, you must set up a regular user profile in addition to a preauthentication profile. RADIUS Profile for Subsequent Authentication Types If you specified subsequent authentication in the preauthentication profile, you must also specify the authentication types to be used for subsequent authentication.

Table 3. Note You should use this VSA only if subsequent authentication is required because it specifies the authentication type for subsequent authentication. Note Do not configure the ppp authentication command with the radius command. Note If subsequent authentication is required, the authorization attributes in the preauthentication profile are not applied. Step 2 configure terminal Example: Device configure terminal Enters global configuration mode.

Step 5 address ipv4 ip-address Example: Device config-radius-server address ipv4 Configuring a Device to Expand Network Access Server Port Information Sometimes PPP or login authentication occurs on an interface that is different from the interface on which the call itself comes in. Note The radius-server attribute nas-port format command replaces the radius-server extended-portnames command and the radius-server attribute nas-port extended command.

Step 3 radius-server configure-nas Example: Device config radius-server configure-nas Optional Tells the Cisco device or access server to query the RADIUS server for the static routes and IP pool definitions used throughout its domain. Note Because the radius-server configure-nas command is used when the Cisco device starts up, it does not take effect until you issue a copy system:running-config nvram:startup-config command.

Step 4 radius-server attribute nas-port format Example: Device config radius-server attribute nas-port format Expands the size of the NAS-Port attribute from 16 to 32 bits to display extended interface information. Step 4 aaa route download time Example: Device config aaa route download Enables the download static route feature and sets the amount of time in minutes between downloads. Step 6 interface dialer number Example: Device config interface dialer 1 Defines a dialer rotary group and enters interface configuration mode.

Step 7 dialer aaa Example: Device config-if dialer aaa Allows a dialer to access the AAA server for dialing information. Step 8 dialer aaa suffix suffix password password Example: Device config-if dialer aaa suffix samp password password12 Allows a dialer to access the AAA server for dialing information and specifies a suffix and nondefault password for authentication. Step 5 exit Example: Device exit Exits the device session.

This command enables AAA. The next set of commands configures multiple host entries for the same IP address. Figure 1. Topology for Configuration Examples! Enable AAA globally. Enable VPDN. Define VPDN group number 1. Enable global AAA securities services. RADIUS is a fully open protocol, distributed in source code format, that can be modified to work with any security system currently available. Your software release may not support all the features documented in this module.

For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the Feature Information Table at the end of this document.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www. An account on Cisco. RADIUS has been implemented in a variety of network environments that require high levels of security while maintaining network access for remote users. In addition to configuring preauthentication on your Cisco router, you must set up the preauthentication profiles on the RADIUS server.

To set up the RADIUS preauthentication profile, use the call type string as the username, and use the password defined in the ctype command as the password. The table below lists the call type strings that may be used in the preauthentication profile. Callback allows remote network users such as telecommuters to dial in to the NAS without being charged.

When callback is required, the NAS hangs up the current call and dials the caller back. When the NAS performs the callback, only information for the outgoing connection is applied. The rest of the attributes from the preauthentication access-accept message are discarded. The following example shows a RADIUS profile configuration with a callback number of and the service type set to outbound. The following example protects against accidentally calling a valid telephone number but accessing the wrong router by providing the name of the remote router, for use in large-scale dial-out:.

The modem management VSA has the following syntax:. Hence, this modem management feature is supported only with MICA modems and newer technologies. This feature is not supported with Microcom modems. If preauthentication passes, you may use vendor-proprietary RADIUS attribute Require-Auth in the preauthentication profile to determine whether subsequent authentication is to be performed.

If attribute , returned in the access-accept message, has a value of 0, then subsequent authentication will not be performed. If attribute has a value of 1, then subsequent authentication will be performed as usual. If attribute is missing in the preauthentication profile, then a value of 1 is assumed, and subsequent authentication is performed. If you have specified subsequent authentication in the preauthentication profile, you must also specify the authentication types to be used for subsequent authentication.

To specify the authentication types allowed in subsequent authentication, use the following VSA:. To specify that multiple authentication types are allowed, you can configure more than one instance of this VSA in the preauthentication profile. The sequence of the authentication type VSAs in the preauthentication profile is significant because it specifies the order of authentication types to be used in the PPP negotiation.

This VSA is a per-user attribute and replaces the authentication type list in the ppp authentication interface configuration command. If only preauthentication is used to authenticate a call, the NAS could be missing a username when it brings up the call. The VSA for specifying the username has the following syntax:. If no username is specified, the DNIS number, CLID number, or call type is used, depending on the last preauthentication command that has been configured for example, if clid was the last preauthentication command configured, the CLID number will be used as the username.

If subsequent authentication is used to authenticate a call, there might be two usernames: one provided by RADIUS and one provided by the user. In this case, the username provided by the user overrides the one contained in the RADIUS preauthentication profile; the username provided by the user is used for both authentication and accounting. In the case of two-way authentication, the calling networking device will need to authenticate the NAS.

Instead, the username and password can be included in the Access-Accept messages for preauthentication. To apply for PAP, do not configure the ppp pap sent-name password command on the interface. For CHAP, "preauth:send-name" will be used not only for outbound authentication, but also for inbound authentication.

For a CHAP inbound case, the NAS will use the name defined in "preauth:send-name" in the challenge packet to the caller networking device. For a CHAP outbound case, both "preauth:send-name" and "preauth:send-secret" will be used in the response packet. If only preauthentication is configured, then subsequent authentication will be bypassed.

Note that because the username and password are not available, authorization will also be bypassed. However, you may include authorization attributes in the preauthentication profile to apply per-user attributes and avoid having to return subsequently to RADIUS for authorization. To initiate the authorization process, you must also configure the aaa authorization network command on the NAS.

You may configure authorization attributes in the preauthentication profile with one exception: the service-type attribute attribute 6. The service-type attribute must be converted to a VSA in the preauthentication profile. This VSA has the following syntax:.

AAA authorization lets you set parameters that restrict a user's access to the network. The AAA accounting feature enables you to track the services users are accessing and the amount of network resources they are consuming. To enable the network access server to attempt more than one login host when trying to connect a dial-in user, you can enter as many as three Login-IP-Host entries in the user's profile on the RADIUS server. The order in which the hosts are entered is the order in which they are attempted.

Use the ip tcp synwait-time command to set the number of seconds that the NAS waits before trying to connect to the next host on the list; the default is 30 seconds. To control whether user responses to access-challenge packets are echoed to the screen, you can configure the Prompt attribute in the user profile on the RADIUS server.

This attribute is included only in Access-Challenge packets. The following example shows the Prompt attribute set to No-Echo, which prevents the user's responses from echoing:. To allow user responses to echo, set the attribute to Echo. If the Prompt attribute is not included in the user profile, responses are echoed by default. This attribute overrides the behavior of the radius-server challenge-noecho command configured on the access server. For example, if the access server is configured to suppress echoing, but the individual user profile allows echoing, then the user responses are echoed.

The IETF draft standard specifies a method for communicating vendor-specific information between the network access server and the RADIUS server by using the vendor-specific attribute attribute Vendor-specific attributes VSAs allow vendors to support their own extended attributes not suitable for general use.

Cisco's vendor ID is 9, and the supported option has vendor-type 1, which is named "cisco-avpair. Note that any AV pair can be made optional. The following example shows how to cause a user logging in from a network access server to have immediate access to EXEC commands:. To have the Cisco router or access server query the RADIUS server for static routes and IP pool definitions when the device starts up, use the radius-server configuration-nas command.

If two different host entries on the same RADIUS server are configured for the same service--for example, accounting--the second host entry configured acts as failover backup to the first one. If the first host entry fails to provide accounting services, the network access server will try the second host entry configured on the same device for accounting services. The timeout, retransmission, and encryption key values are configurable globally for all RADIUS servers, on a per-server basis or in some combination of global and per-server settings.

To apply these settings globally to all RADIUS servers communicating with the router, use the three unique global commands: radius-server timeout , radius-server retransmit , and radius-server key. Vendor-proprietary attributes will not be supported unless you use the radius-server host non-standard command.

There are some situations when PPP or login authentication occurs on an interface that is different from the interface on which the call itself comes in. For example, in a V. The upper 16 bits of the NAS-Port attribute display the type and number of the controlling interface; the lower 16 bits indicate the interface undergoing authentication.

Expands the size of the NAS-Port attribute from 16 to 32 bits to display extended interface information. VSAs can be turned on by entering the radius-server vsa send command. The port information in this attribute is provided and configured using the aaa nas port extended command. If you do not want this information to be sent, you can suppress it by using the no radius-server attribute nas-port command. After this command is configured, the standard NAS-Port attribute will no longer be sent.

Configuring the router to use AAA server groups provides a way to group existing server hosts. This allows you to select a subset of the configured server hosts and use them for a particular service. A server group is used in conjunction with a global server-host list. The server group lists the IP addresses of the selected server hosts. Server groups can also include multiple host entries for the same server, as long as each entry has a unique identifier.

If two different host entries on the same RADIUS server are configured for the same service--for example, accounting--the second host entry that is configured acts as failover backup to the first one. To define a server host with a server group name, enter the following commands in global configuration mode.

The listed server must exist in global configuration mode. Each server in the group must be defined previously using the radius-server host command. After you have configured a server host with a server name, you can use the deadtime command to configure each server per server group. Configuring deadtime within a server group allows you to direct AAA traffic to separate groups of servers that have different operational characteristics. Configuring deadtime is not limited to a global configuration.

A separate timer is attached to each server host in every server group. Therefore, when a server is found to be unresponsive after numerous retransmissions and timeouts, the server is assumed to be dead. The timers attached to each server host in all server groups are triggered.

In essence, the timers are checked and subsequent requests to a server once it is assumed to be dead are directed to alternate timers, if configured. When the network access server receives a reply from the server, it checks and stops all configured timers if running for that server in all server groups. If the timer has expired, the server to which the timer is attached is assumed to be alive.

This becomes the only server that can be tried for later AAA requests using the server groups to which the timer belongs. The size of the server group will be slightly increased because of the addition of new timers and the deadtime attribute. The overall impact of the structure depends on the number and size of the server groups and how the servers are shared among server groups in a specific configuration.

DNIS preauthentication enables preauthentication at call setup based on the number dialed. The DNIS number is sent directly to the security server when a call is received. If authenticated by AAA, the call is accepted. The DNIS number identifies the number that was called to reach you. For example, suppose you want to share the same phone number with several customers, but you want to know which customer is calling before you pick up the phone.

You can customize how you answer the phone because DNIS allows you to know which customer is calling when you answer. Additionally, using server groups, you can specify the same server group for AAA services or a separate server group for each AAA service. Cisco IOS software provides the flexibility to implement authentication and accounting services in several ways:.

Because each of these AAA configuration methods can be configured simultaneously, Cisco has established an order of precedence to determine which server or groups of servers provide AAA services. The order of precedence is as follows:.

To map a server group with a group name with DNIS number, perform the following task. Router config a aa dnis map authentication ppp group sg1. The available call information includes the following:. With CAS, the call must be answered; however, the call can be dropped if preauthentication fails. If the server authorizes the call, then the NAS accepts the call. If the server does not authorize the call, then the NAS sends a disconnect message to the public network switch to reject the call.

When the timer expires, the NAS uses a configurable parameter to accept or reject the incoming call that has no authorization. They may also be used, for instance, to specify whether subsequent authentication should occur and, if so, what authentication method should be used. Because response times for preauthentication and authentication requests can vary, the guard timer allows you to control the handling of calls. If the NAS does not receive a response from AAA before the guard timer expires, it accepts or rejects the calls on the basis of the configuration of the timer.

To set a guard timer to accept or reject a call in the event that the RADIUS server fails to respond to an authentication or preauthentication request, perform the following task. Large-scale dial-out eliminates the need to configure dialer maps on every NAS for every destination.

Instead, you can create remote site profiles that contain outgoing call attributes on the AAA server. The profile is downloaded by the NAS when packet traffic requires a call to be placed to a remote site. The default suffix of the username, "-out," is appended to the username. The format for composing the username attribute is the IP address plus the configured suffix.

To provide username configuration capability for large-scale dial-out, the dialer aaa command is implemented with the new suffix and password keywords. Allows a dialer to access the AAA server for dialing information and specifies a suffix and nondefault password for authentication. Two different host entries on the same RADIUS server are configured for the same services--authentication and accounting.

The second host entry configured acts as failover backup to the first one. The following example shows how to create server group radgroup1 with three different RADIUS server members, each using the default authentication port and accounting port :. The following example shows how to create server group radgroup2 with three RADIUS server members, each with the same IP address but with unique authentication and accounting ports:.

The following example shows how to configure the network access server to recognize two different RADIUS server groups. One of these groups, group1, has two different host entries on the same RADIUS server configured for the same services. Each group is individually configured for deadtime; deadtime for group 1 is one minute, and deadtime for group 2 is two minutes.

The following is a simple configuration that specifies that the DNIS number be used for preauthentication:. The following example shows an ISDN guard timer that is set at milliseconds. The following example shows a CAS guard timer that is set at 20, milliseconds. The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies.

Access to most tools on the Cisco Support and Documentation website requires a Cisco. The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature. The following commands were modified: show aaa servers , show radius statistics.

To view a list of Cisco trademarks, go to this URL: www. Third-party trademarks mentioned are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company.

Any Internet Protocol IP addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.

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