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As explained earlier, the TCP Timestamp option :rfc:`1323` prevents ambiguities while collecting round-trip-time measurements. It plays another very important role in today's high-bandwidth networks. Since TCP uses 32 bits long sequence numbers, the sequence numbers wrap after the transmission of 4 GBytes of data. With 10 Gbps and soon 100 Gbps interfaces, TCP only needs to transmit during a few seconds before reusing the same sequence number. Given that the Maximum Segment Lifetime is still 2 minutes, several packets, belonging to the same TCP connection could use the same sequence number. If one of these packets is severely delayed through the network, it could reappear at the same time as a packet with the same TCP sequence number. To prevent this problem, most modern TCP implementations associate a TCP timestamp option to each segment on transmission. When a TCP stack receives a TCP segment, it checks that its TCP timestamp is valid and if not the segment is discarded :rfc:`7323`.
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| Shortcut | Action |
|---|---|
| ? | Open available keyboard shortcuts. |
| Alt + Home | Navigate to the first translation in the current search. |
| Alt + End | Navigate to the last translation in the current search. |
|
Alt + PageUp or
Ctrl + ↑ or Alt + ↑ or Cmd + ↑ or |
Navigate to the previous translation in the current search. |
|
Alt + PageDown or
Ctrl + ↓ or Alt + ↓ or Cmd + ↓ or |
Navigate to the next translation in the current search. |
|
Ctrl + Enter or
Cmd + Enter |
Submit current form; this works the same as pressing Save and continue while editing translation. |
|
Ctrl + Shift + Enter or
Cmd + Shift +Enter |
Unmark translation as Needing edit and submit it. |
|
Alt + Enter or
Option + Enter |
Submit the string as a suggestion; this works the same as pressing Suggest while editing translation. |
|
Ctrl + E or
Cmd + E |
Focus on translation editor. |
|
Ctrl + U or
Cmd + U |
Focus on comment editor. |
|
Ctrl + M or
Cmd + M |
Shows Automatic suggestions tab. |
|
Ctrl + 1 to
Ctrl + 9 or
Cmd + 1 to Cmd + 9 |
Copies placeable of a given number from source string. |
|
Ctrl + M followed by
1 to 9 or
Cmd + M followed by 1 to 9 |
Copy the machine translation of a given number to current translation. |
|
Ctrl + I followed by
1 to
9 or
Cmd + I followed by 1 to 9 |
Ignore one item in the list of failing checks. |
|
Ctrl + J or
Cmd + J |
Shows the Nearby strings tab. |
|
Ctrl + S or
Cmd + S |
Focus on search field. |
|
Ctrl + O or
Cmd + O |
Copy the source string. |
|
Ctrl + Y or
Cmd + Y |
Toggle the Needs editing checkbox. |
| → | Browse the next translation string. |
| ← | Browse the previous translation string. |
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