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SYMBIAN OS V9.4

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Routes and interfaces

In order to communicate with a remote host through a socket, a protocol must establish:

The actions to do this are performed when:

The standard steps are as follows:

  1. The IP routing table is checked to see if a route to the destination exists. If there is no route (including no default route), then the protocol attempts to invoke its default dial-up interface.

  2. If dial-up is successful, PPP is invoked to establish a connection to the remote peer.

  3. In its set-up stage, PPP obtains a local IP address from the remote peer (if so configured) and is informed of the peer’s IP address.

  4. When TCP/IP is informed that the interface is up, it adds routing entries for the interface. Normally this means that the remote peer becomes the default gateway.

  5. If a local address has not been set by RSocket::Bind(), then the protocol sets the socket’s local address to that obtained in step 3 (which is recorded in the route entry created in step 4), and allocates an ephemeral port number. This process is called automatic binding.