h[3] = (byte) (length & 0xFF);
        return h;
    }

    /**
     * Creates a NetBIOS keep-alive header.
     * Keep-alive packets have type 0x85 and zero length.
     */
    private static byte[] keepAliveHeader() {
        byte[] h = new byte[4];
        h[0] = (byte) SessionServicePacket.SESSION_KEEP_ALIVE;
        h[1] = h[2] = h[3] = 0;
        return h;
    }

    /**