# IP Services Gateway Configuration

This chapter describes how to configure the IPSG.

This chapter covers the following topics:

- Configuration Requirements for the IPSG
- Configuring the IPSG

Configuration Requirements for the IPSG

This section provides a high-level description of the configuration requirements of the IPSG.

The Snoop and Server methods use the same configuration components and differ only in how the IPSG service is configured.

The IPSG can be configured in various ways such as by creating a single context with interfaces for the RADIUS messages and both inbound and outbound data traffic. The following figure presents another method in which the IPSG context manages communication with the access gateway for both RADIUS messaging and inbound data traffic. The ISP context is responsible for all outbound data traffic.

The following figure also shows other important components such as IP access control lists (ACLs) in both contexts as well as an Enhanced Charging Service (ECS) configuration.
Figure 1. IPSG Support

Required Configuration File Components

The following configuration components are required to complete an IPSG configuration file:

- IPSG License
- Card Activations
- Local Context Modifications
  - Network Management Interface
  - Remote Management
  - Administrative Users
- Global Enhanced Charging Service Configuration
- IPSG Context
  - IPSG Service
  - RADIUS Server or Client Configuration
  - Interface for RADIUS messages to/from access gateway
  - Interface for data traffic to/from access gateway
- Service Provider Context
  - IP ACL Configuration
  - Interface for data traffic to/from access gateway
- Port Configuration (bindings)

Required Component Information

Prior to configuring the system, determine the following information:

- Context names
- Service names
- Enhanced Charging Service
  - Rule definitions
  - Rulebase name
- IMS Auth Service
- RADIUS accounting client IP address, dictionary type, and shared secret (RADIUS Server Mode)
- RADIUS accounting server IP address and dictionary type (RADIUS Snoop Mode)
- All Interfaces and ports
  - Interface IP addresses
  - Interface names
  - Port names
  - Port numbers

For a complete understanding of the required information for all configuration mode commands, refer to the Command Line Interface Reference.

## Configuring the IPSG

This section describes how to configure the IPSG to accept RADIUS accounting requests (start messages) in order to extract user information used to apply other services. The following figure illustrates the required components within the system supporting IPSG.
Figure 2. IPSG Configuration Detail

To configure the system to perform as an IPSG:

1. Set initial configuration parameters such as activating processing cards and modifying the local context by referring to procedures in the System Administration Guide.
2. Configure the global active charging parameters as described in the Enhanced Charging Service Administration Guide.
3. Configure the system to perform as an IPSG by applying the example configurations presented in the IPSG Context and Service Configuration section.
4. Configure the Service Provider context by applying the example configuration presented in the ISP Context Configuration section.
5. Bind interfaces to ports as described in the System Administration Guide.
6. Save your configuration to flash memory, an external memory device, and/or a network location using the Exec mode command save configuration. For additional information on how to verify and save configuration files, refer to the System Administration Guide and the Command Line Interface Reference.

   IMPORTANT:

   Commands used in the configuration examples in this section provide base functionality to the extent that the most common or likely commands and/or keyword options are presented. In many cases, other optional commands and/or keyword options are available. Refer to the Command Line Interface Reference for complete information regarding all commands.

### IPSG Context and Service Configuration

To configure IPSG context and service:

1. Create an IPSG context and the IPSG service by applying the example configuration in one of the following sections as required: Option 1: RADIUS Server Mode Configuration Option 2: RADIUS Server with Proxy Mode Configuration Option 3: RADIUS Snoop Mode Configuration
2. Create two interfaces within the IPSG context for communication with the access gateway by referring to the Creating and Configuring Ethernet Interfaces and Ports procedure in the System Administration Guide.

Option 1: RADIUS Server Mode Configuration

To create an IPSG context and IPSG service in RADIUS Server Mode, use the following configuration:

    configure

       context <ipsg_context_name>

          ipsg-service <ipsg_service_name> mode radius-server

             bind
    address <ipv4/ipv6_address>

             radius
    dictionary <dictionary_name>

             radius
    accounting client <ipv4/ipv6_address> [ encrypted ] key <key> [ dictionary <dictionary_name> ] [ disconnect-message [ dest-port <port_number> ] ]

             end

Option 2: RADIUS Server with Proxy Mode Configuration

To create an IPSG context and IPSG service in RADIUS Server Mode with IPSG authentication and accounting proxy configuration, use the following configuration:

    configure

       context <ipsg_context_name>

          ipsg-service <ipsg_service_name> mode radius-server

             bind
    address <ipv4/ipv6_address>

             radius
    dictionary <dictionary_name>

             radius
    accounting client <ipv4/ipv6_address> [ encrypted ] key <key> [ dictionary <dictionary_name> ] [ disconnect-message [ dest-port <port_number> ] ]

    # IPSG Authentication
    Proxy Configuration:

             bind
    authentication-proxy address <ipv4/ipv6_address>

             connection
    authorization [ encrypted ] password <password>

             radius
    dictionary <dictionary_name>

             radius
    accounting client <ipv4/ipv6_address> [ encrypted ] key <key> [ dictionary <dictionary_name> ] [ disconnect-message [ dest-port <port_number> ] ]

             exit

          aaa
    group default

             radius
    attribute nas-ip-address address <ipv4/ipv6_address>

             radius
    dictionary <dictionary_name>

             radius
    server <ipv4/ipv6_address> [ encrypted ] key <key> port <port_number>

             radius
    accounting server <ipv4/ipv6_address> [ encrypted ] key <key> port <port_number>

             exit

    # IPSG Accounting
    Proxy Configuration:

          ipsg-service <ipsg_service_name> mode radius-server

             bind
    accounting-proxy address <ipv4/ipv6_address> port <port_number>

             radius
    dictionary <dictionary_name>

             radius
    accounting client <ipv4/ipv6_address> [ encrypted ] key <secret_key> [ dictionary <dictionary_name> ] [ disconnect-message [ dest-port <port_number> ] ]

             exit

          aaa
    group default

             radius
    attribute nas-ip-address address <ipv4/ipv6_address>

             radius
    dictionary <dictionary_name>

             radius
    accounting server <ipv4/ipv6_address> [ encrypted ] key <key> port <port_number>

             end

Notes:

- If both IPSG Service and client/server dictionaries are configured, the client/server dictionary takes precedence over the IPSG Service dictionary.
- If both RADIUS server and client dictionaries are configured, the client dictionary takes precedence over the server dictionary.
- For basic AAA configurations please refer to the AAA and GTP Interface Administration and Reference.

Option 3: RADIUS Snoop Mode Configuration

To create an IPSG context and IPSG service in RADIUS Snoop Mode, use the following configuration:

    configure

       context <ipsg_context_name>

          ipsg-service <ipsg_service_name> mode radius-snoop

             bind

             connection
    authorization [ encrypted ] password <password>

             radius
    accounting server <ipv4/ipv6_address>

             radius
    dictionary <dictionary_name>

             end

### ISP Context Configuration

To configure the ISP context:

1. Create an ISP context as described in the Creating the ISP Context section.
2. Create an interface within the ISP context to connect to the data network as described in the System Administration Guide.
3. Create an IP access control list within the ISP context as described in the IP Access Control Lists chapter of the System Administration Guide.

Creating the ISP Context

To configure an ISP context, use the following configuration. Note that the following configuration also includes an IP route for data traffic through the IPSG context.

    configure

       context <isp_context_name>

          subscriber default

             exit

          ip
    access-list <access_list_name>

             redirect
    css service <css_service_name> any

             permit any

             exit

          aaa
    group default

             exit

          ip
    route {<ipv4_address/mask> | <ipv6_address> } next-hop <next_hop_ipv4/ipv6_address> <isp_data_interface_name>

             end

### Enhanced and Optional Configurations

This section describes how to configure enhanced and optional configurations:

- Configure Virtual APN support as described in the Virtual APN Support Configuration section.
- Configure R7 Gx Interface support as described in the Gx Interface Configuration section.
- Configure Gy Interface support as described in the Gy Interface Configuration section.

Gx Interface Configuration

For information on how to configure R7 Gx interface support, please refer to the Configuring Rel. 7 Gx Interface section of the Gx Interface Support appendix.

Note the following for IPSG:

- Only single bearer/session concept is supported. Multiple bearer concept is not applicable.
- Only PCRF binding is applicable. PCEF binding is not applicable.

Gy Interface Configuration

For information on how to configure Gy interface support, refer to the Gy Interface Support appendix.