How to capture network packets with tcpdump during boot time?

Updated -

Environment

  • Red Hat Enterprise Linux 10
  • Red Hat Enterprise Linux 9
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 5

Resolution

RHEL 7 and newer

  • Create the systemd unit file /etc/systemd/system/tcpdum...

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