protected void checkChannel( int channel )
    {
        if( channel < MessageConnection.CHANNEL_DEFAULT_RELIABLE 
            || channel >= alternatePorts.size() ) {
            throw new IllegalArgumentException( "Channel is undefined:" + channel );
        }              
    }
A default implementation of the Server interface that delegates
 its network connectivity to kernel.Kernel.

 @version   $Revision$
 @author    Paul Speed
jme3-networking/src/main/java/com/jme3/network/base/DefaultServer.java