> 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.

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