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Jeff Rhodes
Asked: 2020-11-10 12:29:39 +0800 CST

Disable TCP Offload for CentOS 7 on laptop and VPS

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I can disable outgoing and incoming TCP Offload on MACOS in user's .bash_profile file:

sudo sysctl net.link.generic.system.hwcksum_tx=0
sudo sysctl net.link.generic.system.hwcksum_rx=0

This stops the incessant Wireshark "TCP CHECKSUM INVALID" outgoing ipv4 packets. How do I do the same for CentOS 7?

I want the Wireshark reports only about the real invalid TCP Checksum packets. So I have checked the box under Protocols->TCP "Validate the TCP checksum if possible".

centos7 tcp-offload-engine

1 Answers

  1. To do it in the linux you should use the ethtool program.

    For example, to disable only checksum offload you can run the ethtool -K <iface> tx off rx off command, where <iface> is the name of the corresponded interface.

    Also, there are other offloads, those are enabled by default. So, if you'll see the huge packets in wireshark - don't worry - it's some offload side effect.

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