標籤：而且 情況 evel 返回 相同 host 重複資料 資料 ted
DUPLICATE AND DAMAGED PACKETS
- The ping utility will report duplicate and damaged packets. Duplicate packets should never occur when pinging a unicast address, and seem to be caused by inappropriate link-level retransmissions. Duplicates may occur in many
- situations and are rarely (if ever) a good sign, although the presence of low levels of duplicates may not always be cause for alarm. Duplicates are expected when pinging a broadcast or multicast address, since they are not really
duplicates but replies from different hosts to the same request.
Damaged packets are obviously serious cause for alarm and often indicate broken hardware somewhere in the ping packet’s path (in the network or in the hosts).
大概意思：重複和損壞的資料包
- Ping將報告重複和損壞的資料包。當使用單播地址時，不應該出現重複的資料包，而且出現重複資料包似乎時是由不適當的鏈路重傳引起的。
- 重複可能在很多情況下發生，而且很少（如果有的話）是一個好的現象，儘管低水平的重複現象不總會造成警報。
當在ping一個廣播或多播地址時會出現重複包，因為他們不是真正的重複，而是來自不同主機對相同請求的是響應。
損壞包顯然時可以引起嚴重的恐慌，通常指出在ping包的路徑下哪部分硬體壞掉了（網路或主機）。
Android 平台ping 對方ip返回 +3 duplicates （重複回應包）
