if ( ia == null ){
Debug.out( "Address '" + address + "' is unresolved" );
throw( new DHTTransportException( "Address '" + address + "' is unresolved" ));
}
serialiseByteArray( os, ia.getAddress(), 16); // 16 (Pv6) + 1 length
os.writeShort( address.getPort()); //19