Try   HackMD

校園網路簡易錯誤排除檢查方法

當使用校園網路出現問題時,可以先透過以下排除檢查方法來檢查網路問題:

  1. Wi-Fi連接檢查:
    確保Wi-Fi功能已經啟用。在菜單列中的Wi-Fi圖示可快速檢查狀態。
    檢查連接的Wi-Fi網路,確保選擇正確的網路。
    嘗試重新連接Wi-Fi或選擇其他可用的Wi-Fi網路。

Image Not Showing Possible Reasons
  • The image was uploaded to a note which you don't have access to
  • The note which the image was originally uploaded to has been deleted
Learn More →

Image Not Showing Possible Reasons
  • The image was uploaded to a note which you don't have access to
  • The note which the image was originally uploaded to has been deleted
Learn More →

  1. 更新作業系統和軟體:
    定期檢查是否有macOS系統更新,以確保獲得最新的網路相關修補程式。
    更新應用程式,包括瀏覽器和其他網路相關應用程式。(點選系統設定進入)

Image Not Showing Possible Reasons
  • The image was uploaded to a note which you don't have access to
  • The note which the image was originally uploaded to has been deleted
Learn More →

  1. 檢查網路設定:
    在「系統偏好設定」中,進入「網路」設定,確認Wi-Fi或以太網設定是否正確。
    適時檢查並更新TCP/IP設定,或重置網路設定以解決連接問題。

Image Not Showing Possible Reasons
  • The image was uploaded to a note which you don't have access to
  • The note which the image was originally uploaded to has been deleted
Learn More →

Image Not Showing Possible Reasons
  • The image was uploaded to a note which you don't have access to
  • The note which the image was originally uploaded to has been deleted
Learn More →

  1. 防火牆和安全性設定:
    檢查防火牆設定,確保不會阻擋需要的網路流量。
    適時檢查安全與隱私設定,確保應用程式有權限使用網路。

Image Not Showing Possible Reasons
  • The image was uploaded to a note which you don't have access to
  • The note which the image was originally uploaded to has been deleted
Learn More →

  1. 使用線材連接:
    如果是使用有線連接,確認網路線是否插入正確,並檢查有線連接是否穩定。
    在有線連接的情況下,確保Wi-Fi功能已經關閉。

  2. 瀏覽器設定檢查:
    如果僅在特定瀏覽器中遇到問題,檢查瀏覽器設定,確保沒有阻擋網站或插件的設定。(以 google 為例檢查插件)

Image Not Showing Possible Reasons
  • The image was uploaded to a note which you don't have access to
  • The note which the image was originally uploaded to has been deleted
Learn More →

  1. 使用網路診斷工具:
    使用Mac內建的網路診斷工具,例如「網路診斷」,協助識別和解決網路問題。
  • command + 空白鍵(開啟搜尋,打上網路診斷)

透過 ping 指令方式來檢查校園網路是否有誤:

  • 在Windows系統中,你可以按下Win + R,輸入cmd,然後按下Enter來開啟命令提示字元。
  • 在Mac或Linux系統中,你可以開啟終端機。

在命令提示字元或終端機中,輸入以下指令:

ping fb.me (按下 Ctrl +C 中斷)

Mac系統畫面(Mac 需按 control + C 中斷才會停止):

Image Not Showing Possible Reasons
  • The image was uploaded to a note which you don't have access to
  • The note which the image was originally uploaded to has been deleted
Learn More →

遺失封包的錯誤訊息:

請求超時:

Request timeout for icmp_seq 0
Request timeout for icmp_seq 1
Request timeout for icmp_seq 2
.
.
.

如果 ping 出現 Request timeout 的訊息,這表示在該次嘗試中沒有收到回應,即發生了封包遺失。遺失封包的出現可能意味著網路連接不穩定,甚至有可能有嚴重的網路問題。

封包遺失率:

7 packets transmitted, 0 packets received, 100.0% packet loss
7 個傳輸的封包, 0 個收到的封包, 100.0% 封包遺失

封包遺失率越高,網路品質就越差,顯示了一定程度的網路不穩定性。

測試連線伺服器的狀態

  • 在Mac或Linux系統中,你可以開啟終端機。

在命令提示字元或終端機中,輸入以下指令:

traceroute fb.me

Image Not Showing Possible Reasons
  • The image was uploaded to a note which you don't have access to
  • The note which the image was originally uploaded to has been deleted
Learn More →

在標記的第三點開始會看到 hinet-ip 字眼,那是在校外開始使用光世代網路連線,後方顯示的 9.930 ms、16.928 ms、10.605 ms 等等代表傳送封包的時間速度,花的時間越多代表網路品質越差。

在第三點後已經屬於校外網路,如果在第三點後傳送封包速度出現問題便與校園網路無關

請注意: 若在ping指令的輸出中遇到星號(*),表示該節點可能設有某些防護措施,導致我們發送的封包資訊被丟棄。這並不代表你的網路連線有問題。

測試網路速度:

需要使用情況:

感受到網路速度緩慢:

如果您在瀏覽網頁、觀看影片或下載檔案時感受到速度緩慢,測試網站可以提供具體的數據,幫助確認是否存在實際的網速問題。

網頁開啟速度遲緩:

如果您發現網頁花費過多時間才能完全載入,可能是網路速度不足的表現。透過測速網站,您可以評估實際的網頁載入速度。

檔案下載速度不佳:

在下載大型檔案時,檔案下載速度緩慢可能影響工作效率。透過測速網站,您可以了解實際的下載速度,有助於判斷是否需要進一步優化網路連接。

視訊通話品質差:

在參與線上會議或視訊通話時,網速不足可能導致影像卡頓或音頻中斷。透過測速網站,您可以確保網速足夠支持流暢的視訊通話品質。

網路測試工具:

當老師同學發現網路速度變慢時可以通過以下測速工具來對校園網路進行測試:

詮釋測試結果:

  • 上傳速度:影響您上傳文件或參與網路會議的效果。確保速度足夠滿足需求。
  • 下載速度:影響您下載文件、觀看視頻和參與網路課程的效果。確保速度足夠流暢。

網路測試注意事項:

  • 在進行測試時,請務必關閉其他需要網路運作的應用程式,例如P2P、FTP、MAIL、影音串流(如Youtube)、即時通訊、視訊、網路電話等應用程式。同時,請關閉占用高效能的程式,以確保測速環境的純粹性。請關閉所有瀏覽器,僅保留一個瀏覽器視窗進行測速作業。

  • 需要注意的是,傳輸速率可能會受到多種因素的影響,包括距離、環境、連接的網站接取頻寬,以及用戶終端設備等級等。這些因素可能導致傳輸速率的降低。

  • 此外,防毒軟體為了保障資訊安全,在進行網路收送資料的同時會進行掃瞄。這種掃瞄機制可能對電腦的網路傳輸效能產生一定程度的影響。在進行測速時,請注意考慮防毒軟體可能對測試結果的影響。

  • 為確保測試的可靠性,建議在進行測速前,仔細檢查並遵循上述建議,以提供最準確的測速數據。

SpeedTest:

點選中間按下 Go 的按鈕,如果有存取權限請求按下同意

Image Not Showing Possible Reasons
  • The image was uploaded to a note which you don't have access to
  • The note which the image was originally uploaded to has been deleted
Learn More →

測試完結果將會得到目前網路的上傳速度下載速度的數值

Image Not Showing Possible Reasons
  • The image was uploaded to a note which you don't have access to
  • The note which the image was originally uploaded to has been deleted
Learn More →

臺灣學術網路測試系統:

在進入台灣學術網路測試系統後點選用戶-節點的按鈕

Image Not Showing Possible Reasons
  • The image was uploaded to a note which you don't have access to
  • The note which the image was originally uploaded to has been deleted
Learn More →

進入用戶-節點後可以看到目前位置的 IP 以及可以選擇想要進行測試的節點測試主機

Image Not Showing Possible Reasons
  • The image was uploaded to a note which you don't have access to
  • The note which the image was originally uploaded to has been deleted
Learn More →

選擇完節點測試主機後可以進行線路品質測試或者網路傳檔測試

Image Not Showing Possible Reasons
  • The image was uploaded to a note which you don't have access to
  • The note which the image was originally uploaded to has been deleted
Learn More →

在測試之前系統會先要求輸入驗證碼

Image Not Showing Possible Reasons
  • The image was uploaded to a note which you don't have access to
  • The note which the image was originally uploaded to has been deleted
Learn More →

以下為線路品質測試的結果(綠色表示良好)

Image Not Showing Possible Reasons
  • The image was uploaded to a note which you don't have access to
  • The note which the image was originally uploaded to has been deleted
Learn More →

以下為網路傳檔測試結果(綠色表示良好)

Image Not Showing Possible Reasons
  • The image was uploaded to a note which you don't have access to
  • The note which the image was originally uploaded to has been deleted
Learn More →

網路錯誤自我檢測表格參考:

序號 檢測過程
1 確認網路是否開啟以及確定是否連線
2 確保獲得最新的網路相關修補程式
3 檢查網路設定
4 檢查防火牆設定
5 使用網路診斷工具
6 檢查線路連接(有連接線路才需檢測)
7 瀏覽器設定檢查(只有特定瀏覽器沒網路才需檢測)

通報事項:

若是上述網路錯誤自我檢測表格內容都做過但還是無法進行網路連線,或者在使用 ping 指令查看網路狀態時發現錯誤內容,可通報資訊網路中心。