____ _ _ _ _
| _ \ ___ | |_ (_) _ __ ___ __| | (_) __ _
| |_) | / _ \ | __| | | | '_ \ / _ \ / _| | | | / _ |
| _ < | __/ | |_ | | | |_) | | __/ | (_| | | | | (_| |
|_| \_\ \___| \__| |_| | .__/ \___| \__,_| |_| \__,_|
|_|
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SACK
ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
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SACK (AbkΓΌrzung fΓΌr Selective Acknowledgment) ist eine in RFC 2018cite-ref-1[1] standardisierte Erweiterung des Transmission Control Protocol (TCP), die fΓΌr eine Steigerung des Datendurchsatzes bei Paketverlusten sorgt. SACK ermΓΆglicht, dass bei Paketverlusten nicht der gesamte Inhalt des TCP Windows, sondern nur das fehlende Datenpaket neu angefordert werden muss.
Dabei bestΓ€tigt der EmpfΓ€nger im Falle eines Datenverlustes anhand der Sequenznummern selektiv diejenigen Pakete des TCP-Windows, die vollstΓ€ndig empfangen wurden. Der Sender sendet nun lediglich die fehlenden Pakete erneut.
Folgende Betriebssysteme unterstΓΌtzen SACK:
β’ FreeBSD seit Version 5.3
β’ Linux ab Version 2.2
β’ Mac OS X ab Version 10.4.6
β’ Microsoft Windows ab Windows 98
β’ MorphOS seit Version 3.4
β’ NetBSD seit Version 3.0
Contents
β’ Weblinks
β’ Einzelnachweise
ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
Weblinks
β’ RFC: 2018 β TCP Selective Acknowledgment Options. 1996 (englisch).
β’ Sally Floyds Webpage mit verschiedenen Papers zum Thema
β’ TCP Option 4 SACK permitted. networksorcery.com
β’ TCP Option 5 SACK. networksorcery.com
Einzelnachweise