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So schalten Sie bei Linux TCP Timestamps ab

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TCP Timestamps lassen sich unter Linux zur Laufzeit abschalten. Dazu muss auf der Shell folgender Befehl abgesetzt werden:

$ echo 0 > /proc/sys/net/ipv4/tcp_timestamps

Diese Einstellung ist jedoch flüchtig und geht nach einem Neustart des Computers verloren. Um diese persistent zu halten, ist es nötig in der Datei /etc/sysctl.conf folgenden Eintrag zu machen:

net.ipv4.tcp_timestamps = 0

2 Comments

  1. Pingback: TCP Timestamps | netsense blog

  2. „net.ipv4.tcp_timestamps
    ***Generally this should be a good idea to have turned on. The only exception would be if you live on an extremely slow connection such as a 56 kbps modem connection to the Internet.***

    The tcp_timestamps variable tells the kernel to use timestamps as defined in RFC 1323. In short, this is an TCP option that can be used to calculate the Round Trip Measurement in a better way than the retransmission timeout method can. This should be backwards compatible in almost all circumstances so you could very well turn this on if your host lives on a high speed network. If you only use up to an 10mbps connection of some sort(LAN or Internet or anything for that matter), you should manage fairly well without this option, and at really low speeds, you may even be better off with this variable turned off.

    This variable takes a boolean value and is per default set to 1, or enabled.“

    from https://ticketing.nforce.com/index.php?/Knowledgebase/Article/View/40/0/sysctl-settings-which-can-have-a-negative-affect-on-the-network-speed

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