Example 1: Simple IP Support Using a Single Source and Destination Context
The most simple configuration that can be implemented on the system to support Simple IP data applications requires that two contexts (one source and one destination) be configured on the system as shown below.
The source context will facilitate the packet data serving node (PDSN) service(s) and the R-P and AAA interfaces. The source context will also be configured to provide AAA functionality for subscriber sessions. The destination context will facilitate the packet data network interface(s).
In this configuration, the wireless carrier provides the function of an Internet Service Provider (ISP) to their subscribers. The PDSN service in the source context terminates subscriber point-to-point protocol (PPP) sessions and routes their data traffic through the destination context to and from a packet data network such as the Internet.
Information Required
Prior to configuring the system as shown in this example, there is a minimum amount of information required. The following sections describe the information required to configure the source and destination contexts.
Source Context Configuration
| Required Information | Description | ||
|---|---|---|---|
|
Source context name |
This is an identification string between 1 and 79 characters (alpha and/or numeric) by which the source context will be recognized by the system. |
||
|
R-P Interface Configuration |
|||
|
R-P interface name |
This is an identification string between 1 and 79 characters (alpha and/or numeric) by which the interface will be recognized by the system. Multiple names are needed if multiple interfaces will be configured. R-P interfaces are configured in the source context. |
||
|
IP address and subnet |
These will be assigned to the R-P interface. Multiple addresses and/or subnets are needed if multiple interfaces will be configured. |
||
|
Physical port number |
This specifies the physical port to which the interface will be bound. Ports are identified by the chassis slot number where the line card resides in, followed by the number of the physical connector on the line card. For example, port 17/1 identifies connector number 1 on the card in slot 17. A single physical port can facilitate multiple interfaces. |
||
|
Physical port description |
This is an identification string between 1 and 79 characters (alpha and/or numeric) by which the physical port will be recognized by the system. Multiple descriptions are needed if multiple ports will be used. Physical ports are configured within the source context and are used to bind logical R-P interfaces. |
||
|
Gateway IP address |
Used when configuring static routes from the R-P interface(s) to a specific network. |
||
|
PDSN service Configuration |
|||
|
PDSN service name |
This is an identification string between 1 and 63 characters (alpha and/or numeric) by which the PDSN service will be recognized by the system. Multiple names are needed if multiple PDSN services will be used. PDSN services are configured in the source context. |
||
|
UDP port number for R-P traffic |
Specifies the port used by the PDSN service and the PCF for communications. The UDP port number and can be any integer value between 1 and 65535. The default value is 699. |
||
|
Authentication protocols used |
Specifies how the system handles authentication: using a protocol (such as CHAP, PAP, or MSCHAP), or not requiring any authentication. |
||
|
Domain alias for NAI-construction |
Specifies a context name for the system to use to provide accounting functionality for a subscriber session. This parameter is needed only if the system is configured to support no authentication. |
||
|
Security Parameter Index Information |
PCF IP address: Specifies the IP address of the PCF that the PDSN service will be communicating with. The PDSN service allows the creation of a security profile that can be associated with a particular PCF. Multiple IP addresses are needed if the PDSN service will be communicating with multiple PCFs. |
||
|
Index: Specifies the shared SPI between the PDSN service and a particular PCF. The SPI can be configured to any integer value between 256 and 4294967295. Multiple SPIs can be configured if the PDSN service is to communicate with multiple PCFs. |
|||
|
Secret: Specifies the shared SPI secret between the PDSN service and the PCF. The secret can be between 1 and 127 characters (alpha and/or numeric). An SPI secret is required for each SPI configured. |
|||
|
Hash-algorithm: Specifies the algorithm used to hash the SPI and SPI secret. The possible algorithms that can be configured are MD5 per RFC 1321 and keyed-MD5 per RFC 2002. The default is MD5. A hash-algorithm is required for each SPI configured. |
|||
|
Replay-protection process: Specifies how protection against replay-attacks is implemented. The possible processes are nonce and timestamp. The default is timestamp with a tolerance of 60 seconds. A replay-protection process is required for each SPI configured. |
|||
|
Subscriber session lifetime |
Specifies the time in seconds that an A10 connection can exist before its registration is considered expired. The time is expressed in seconds and can be configured to any integer value between 1 and 65534, or the timer can be disabled to set an infinite lifetime. The default value is 1800 seconds. |
||
|
AAA Interface Configuration |
|||
|
AAA interface name |
This is an identification string between 1 and 79 characters (alpha and/or numeric) by which the interface will be recognized by the system. Multiple names are needed if multiple interfaces will be configured. AAA interfaces will be configured in the source context. |
||
|
IP address and subnet |
These will be assigned to the AAA interface. Multiple addresses and/or subnets are needed if multiple interfaces will be configured. |
||
|
Physical port number |
This specifies the physical port to which the interface will be bound. Ports are identified by the chassis slot number where the line card resides in, followed by the number of the physical connector on the line card. For example, port 17/1 identifies connector number 1 on the card in slot 17. A single physical port can facilitate multiple interfaces. |
||
|
Physical port description |
This is an identification string between 1 and 79 characters (alpha and/or numeric) by which the physical port will be recognized by the system. Multiple descriptions are needed if multiple ports will be used. Physical ports are configured within the source context and are used to bind logical AAA interfaces. |
||
|
Gateway IP address |
Used when configuring static routes from the AAA interface(s) to a specific network. |
||
|
RADIUS Server Configuration |
|||
|
RADIUS Authentication server |
IP Address: Specifies the IP address of the RADIUS authentication server the source context will communicate with to provide subscriber authentication functions. Multiple addresses are needed if multiple RADIUS servers will be configured. RADIUS authentication servers are configured within the source context. Multiple servers can be configured and each assigned a priority. |
||
|
Shared Secret: The shared secret is a string between 1 and 15 characters (alpha and/or numeric) that specifies the key that is exchanged between the RADIUS authentication server and the source context. A shared secret is needed for each configured RADIUS server. |
|||
|
UDP Port Number: Specifies the port used by the source context and the RADIUS authentication server for communications. The UDP port number can be any integer value between 1 and 65535. The default value is 1812. |
|||
|
RADIUS Accounting server |
IP Address: Specifies the IP address of the RADIUS accounting server that the source context will communicate with to provide subscriber accounting functions. Multiple addresses are needed if multiple RADIUS servers will be configured. RADIUS accounting servers are configured within the source context. Multiple servers can be configured and each assigned a priority. |
||
|
Shared Secret: The shared secret is a string between 1 and 15 characters (alpha and/or numeric) that specifies the key that is exchanged between the RADIUS accounting server and the source context. A shared secret is needed for each configured RADIUS server. |
|||
|
UDP Port Number: Specifies the port used by the source context and the RADIUS Accounting server for communications. The UDP port number can be any integer value between 1 and 65535. The default value is 1813. |
|||
|
RADIUS attribute NAS Identifier |
Specifies the name by which the source context will be identified in the Access-Request message(s) it sends to the RADIUS server. The name must be between 1 and 32 alpha and/or numeric characters and is case sensitive. |
||
|
RADIUS NAS IP address |
Specifies the IP address of the source context\'s AAA interface. A secondary IP address interface can optionally be configured. |
||
|
Default Subscriber Configuration |
|||
|
"Default" subscriber\'s IP context name |
Specifies the name of the egress context on the system that facilitates the PDN ports.
|
||
Destination Context Configuration
| Required Information | Description | ||
|---|---|---|---|
|
Destination context name |
This is an identification string between 1 and 79 characters (alpha and/or numeric) by which the destination context will be recognized by the system.
|
||
|
PDN Interface Configuration |
|||
|
PDN interface name |
This is an identification string between 1 and 79 characters (alpha and/or numeric) by which the interface will be recognized by the system. Multiple names are needed if multiple interfaces will be configured. PDN interfaces are configured in the destination context. |
||
|
IP address and subnet |
These will be assigned to the PDN interface. Multiple addresses and/or subnets are needed if multiple interfaces will be configured. |
||
|
Physical port number |
This specifies the physical port to which the interface will be bound. Ports are identified by the chassis slot number where the line card resides in, followed by the number of the physical connector on the line card. For example, port 17/1 identifies connector number 1 on the card in slot 17. A single physical port can facilitate multiple interfaces. |
||
|
Physical port description(s) |
This is an identification string between 1 and 79 characters (alpha and/or numeric) by which the physical port will be recognized by the system. Multiple descriptions will be needed if multiple ports will be used. Physical ports are configured within the destination context and are used to bind logical PDN interfaces. |
||
|
Gateway IP address(es) |
Used when configuring static routes from the PDN interface(s) to a specific network. |
||
|
IP Address Pool Configuration (optional) |
|||
|
IP address pool name(s) |
If IP address pools will be configured in the destination context(s), names or identifiers will be needed for them. The pool name can be between 1 and 31 alpha and/or numeric characters and is case sensitive. |
||
|
IP pool addresses |
An initial address and a subnet, or a starting address and an ending address, are required for each configured pool. The pool will then consist of every possible address within the subnet, or all addresses from the starting address to the ending address. The pool can be configured as public, private, or static. |
||
How This Configuration Works
The following figure and the text that follows describe how this configuration with a single source and destination context would be used by the system to process a Simple IP data call.
-
A subscriber session from the PCF is received by the PDSN service over the R-P interface.
-
The PDSN service determines which context to use in providing AAA functionality for the session. This process is described in the How the System Selects Contexts section located in the Understanding the System Operation and Configuration chapter of the System Administration Guide.
For this example, the result of this process is that PDSN service determined that AAA functionality should be provided by the Source context.
-
The system communicates with the AAA server specified in the Source context\'s AAA configuration to authenticate the subscriber.
-
Upon successful authentication, the system determines which egress context to use for the subscriber session. This process is described in the How the System Selects Contexts section located in the Understanding the System Operation and Configuration chapter of the System Administration Guide.
The system determines that the egress context is the destination context based on the configuration of either the Default subscriber\'s ip-context name or from the SN-VPN-NAME or SN1-VPN-NAME attributes that is configured in the subscriber\'s RADIUS profile.
-
Data traffic for the subscriber session is routed through the PDN interface in the Destination context.
-
Accounting information for the session is sent to the AAA server over the AAA interface.
Feedback