# IP Services Gateway Engineering Rules

This appendix lists IPSG-specific engineering rules that must be considered prior to configuring the system for your network deployment. General and network-specific rules are available in the appendix of the System Administration Guide for the specific network type.

The following rules are covered in this appendix:

- IPSG Context and Service Rules
- IPSG RADIUS Messaging Rules

IPSG Context and Service Rules

- Only one IPSG service can be configured within a context.
- Single context configurations must have the ingress port identified using the ingress-mode command in the Ethernet Port Configuration Mode.
- In single context configurations, if data packets are received before a session is initiated, the packets could be routed to their destination without being processed. Use separate ingress and egress contexts to prevent this issue.

IPSG RADIUS Messaging Rules

- The sending of RADIUS accounting start messages to the RADIUS server is delayed by the IPSG until a session is successfully started.