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crixus777 發表於 13-10-24 14:49
請問延遲情況只要看終點的就準確嗎? 那中間結點查不到是什麼原因呢? 謝謝!
...
traceroute 只是一種方便檢測的工具... 有些站台基於某些因素,將 ICMP 給屏蔽掉了,所以, traceroute 出來的數據中,若是某節點有"要求等候逾時(Request timed out)"狀態,並不代表該節點真的"斷線(or 連接不上)" ...
我以"MOICA 內政部憑證管理中心"站台為例,當我們使用瀏覽器(ie or firefox or Google chrome)去看時,網頁回應都很正常,但以 traceroute 指令去做偵測時,會有底下註一.所列的反應...
如果節點有回應時間(ms)的數據出來,應該是可以視為節點反應速度快、慢的參考. ^_^
註一.
- $ tracert moica.nat.gov.tw
- Tracing route to moica.nat.gov.tw [61.60.9.10]
- over a maximum of 30 hops:
- 1 80 ms 84 ms 100 ms 203.67.116.1
- 2 99 ms 35 ms 102 ms h125-192-72-75.seed.net.tw [192.72.75.125]
- 3 102 ms 100 ms 35 ms h221-192-72-120.seed.net.tw [192.72.120.221]
- 4 57 ms 97 ms 46 ms R57-137.seed.net.tw [139.175.57.137]
- 5 41 ms 105 ms 100 ms R59-54.seed.net.tw [139.175.59.54]
- 6 110 ms 100 ms 41 ms R58-209.seed.net.tw [139.175.58.209]
- 7 54 ms 184 ms 84 ms R58-22.seed.net.tw [139.175.58.22]
- 8 71 ms 102 ms 39 ms r4208-s2.hinet.net [210.242.214.130]
- 9 52 ms 45 ms 110 ms TPDT-3011.hinet.net [220.128.3.206]
- 10 152 ms 77 ms 41 ms TPDB-3401.hinet.net [220.128.1.221]
- 11 * * * Request timed out.
- 12 * * * Request timed out.
- 13 * * * Request timed out.
- 14 * * * Request timed out.
- 15 * * * Request timed out.
- 16 * * * Request timed out.
- 17 * * * Request timed out.
- 18 * * * Request timed out.
- 19 * * * Request timed out.
- 20 * * * Request timed out.
- 21 * * * Request timed out.
- 22 * * * Request timed out.
- 23 * * * Request timed out.
- 24 * * * Request timed out.
- 25 * * * Request timed out.
- 26 * * * Request timed out.
- 27 * * * Request timed out.
- 28 * * * Request timed out.
- 29 * * * Request timed out.
- 30 * * * Request timed out.
- Trace complete.
複製代碼
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