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<concept xml:lang="en" id="GUID-BF4E220C-2388-517B-87D8-78AB1EA6382E"><title>Architecture</title><shortdesc>This topic describes the Network Interface Manager (NifMan) architecture. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody><section><title>NifMan Architecture</title> <p>The following diagram outlines the main components in the NifMan architecture: </p> <fig id="GUID-71FB9DE6-1171-5486-9480-8A8A6A8F0B29"><image href="GUID-15F209D1-6BC6-5207-B443-25306C232CFC_d0e119860_href.png" placement="inline"/></fig> <p>As shown, the NIFMAN configuration daemon architecture consists of two parts: </p> <ul><li id="GUID-E2F1FCB0-9A25-52ED-BD80-4C91E271F099"><p>An ECom plug-in for NIFMAN </p> <p>The ECom plug-in manages the interface between NIFMAN and the configuration daemon. The ECom plug-in is referred to as the configuration daemon manager. </p> </li> <li id="GUID-335CBA17-63CF-5309-AA5B-009A3CC6198C"><p>The configuration daemon </p> <p>The configuration daemon is a Symbian OS server that runs in its own process. It does not run in the NIFMAN thread. Licensees can write new configuration daemons. </p> </li> </ul> <p>The framework for configuration daemons support the following: </p> <ul><li id="GUID-5B004464-1411-5CDC-8504-0AEE9AFFCA82"><p>Deregistration events </p> <p>Deregistration events notify the daemon when the interface is shutting down. For Mobile IP, the phone can deregister its foreign agent address with the home agent. </p> <p>Alternatively, the daemon can instruct NIFMAN to maintain the logical state of a user session and release the resources associated with the wireless connection. This is called fast dormant mode. </p> </li> <li id="GUID-9D5648A1-0683-5B27-90CD-3C0836CAF09E"><p>Progress notifications </p> <p>Mobile IP reports progress notifications when it registers and deregisters with the foreign agent. The notifications are passed by NIFMAN to the sockets client using <codeph>RConnection::ProgressNotification()</codeph>, for the current interface. </p> </li> </ul> <p>The configuration daemon manager handles one outstanding daemon request at a time. If a request is already being processed, NIFMAN queues a deregistration request which is processed when the previous request is complete. Other types of request are not queued. This permits the handling of the following scenarios: </p> <ul><li id="GUID-CDD25CFF-B4B1-5472-91C8-45EC27D6AF89"><p>Deregistration notification during registration. </p> </li> <li id="GUID-24E5A80D-50A3-5BAA-9B78-07C0872491E5"><p>Deregistration notification during an Ioctl request. </p> </li> <li id="GUID-8859117E-F118-5C21-B0F2-AB327A3C3C72"><p>Deregistration notification when the daemon is being requested to enter fast dormant mode. </p> </li> </ul> </section> </conbody><related-links><link href="GUID-F8482AFB-BD49-5EF2-8092-EAA11862F9C4.dita"><linktext>What is Network Interface Management