How to update ipfrag parameter values in sysctl

Solution Verified - Updated -

Environment

  • Red Hat Enterprise Linux (RHEL) 8
  • Red Hat Enterprise Linux (RHEL) 9

Issue

  • Getting an error sysctl: setting key "net.ipv4.ipfrag_low_thresh": Invalid argument when updating the ipfrag value in sysctl.conf

Resolution

  • Set the high_thresh parameter first, followed by the low_thresh parameter. Here is the example:
vi /etc/sysctl.conf
net.ipv4.ipfrag_high_thresh = 4194304
net.ipv4.ipfrag_low_thresh = 1572864
  • To apply the changes:
sysctl -p

The sysctl values are loaded early in boot, to have this pick up on boot, the initramfs needs to be rebuilt:

dracut -vf

Root Cause

  • Setting low_thresh before high_thresh will receive this error in sysctl.conf

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