List IPv4 kernel networking parameters
Build a paste-ready command, then review its compatibility and effects before running it.
sysctl -a 2>/dev/null | rg '^net\.ipv4\.' | headread-onlyno known side effects Compatibility
LinuxVerified for Linux using posix, bash, zsh syntax.
Operational knowledgereview due 2027-01-20
Requirementssysctlsysctl must be installed and available on PATH.
Version supportsysctl Current supported releasesVerified for linux using posix, bash, zsh syntax; consult compatibility notes for platform-specific differences.
Expected signalsnet.ipv4.ip_forward = 0Representative successful output; values vary with the selected target and system state.
Known errorssysctl: command not foundsysctl is missing or is not available on PATH.
Verifysysctl -a 2>/dev/null | rg '^net\.ipv4\.' | headThe output matches the expected target and exits without an error.Rollback noteNot required: this command is read-only and does not change system state.
Command breakdown
01sysctlCommandRuns the sysctl stage of this one-liner.
02-aOptionConfigures sysctl with the -a option.
032>RedirectionRedirects command input, standard output, or error output.
04/dev/nullArgumentPasses /dev/null to sysctl.
05|PipelinePasses the output on the left to the command on the right.
06rgCommandRuns the rg stage of this one-liner.
07'^net\.ipv4\.'ArgumentPasses '^net\.ipv4\.' to rg.
08|PipelinePasses the output on the left to the command on the right.
09headCommandRuns the head stage of this one-liner.
Example input
sysctl -a 2>/dev/null | rg '^net\.ipv4\.' | head
Example output
net.ipv4.ip_forward = 0
net.ipv4.tcp_congestion_control = cubic
net.ipv4.tcp_fin_timeout = 60
Illustrative output — exact values vary by system and data.
Official sources