Routing behind MS (Mobile Station) allows a UE (User Equipment) device to act as a router for an IPv4 network behind the UE device. If Routing behind MS is enabled, the GGSN and PGW can allow payload with a source IPv4 address (uplink) or destination IPv4 address (downlink) different from the associated MS IP address. The allowed IPv4 address range for the network is connected to the PDP context or EPS bearer of the UE device and is provided at PDP context or EPS bearer creation from RADIUS in the Framed-Route attribute (attribute #22).
Configuring RADIUS for “Routing Behind MS”
Note: Ensure the RADIUS server can support the “Framed-Ip-Netmask” attribute
When creating a PDP context or EPS bearer using Routing behind MS, the allowed network address ranges are provided from RADIUS using the Framed-Route attribute (attribute #22). The Framed-Route attribute is received in the Access-Accept packet.
To configure a shared RADIUS Server at node level, the following settings must be configured:
- Server name and IP addresses
- Gi or SGi address range
- Secret data for authentication
The following settings can optionally be configured:
- Port number
- Routing instance
- Time-out and number of contact attempts
- Quarantine time for failed servers
Configure the EPG to receive dynamic IP address ranges in the framed-ip-netmask attribute (Each UE IP address range allocated by a RADIUS server counts as a framed-route in the routing table on the Node Management Board (NMB)).
[Note: For an existing APN, before associating or disassociating a shared RADIUS server with this APN, either stop the GGSN and PGW applications, or delete the existing APN and configure it as a new APN without stopping the GGSN and PGW applications.]
