Manage kernel modules and their parameters

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Manage kernel modules and their parameters

In this exercise, you need to modify a kernel module to provide more information. *This course is not approved or sponsored by Red Hat.*

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Lab Info

Level

Advanced

Last updated

Aug 30, 2025

Duration

1h 0m

Challenge

Enable nf_conntrack time stamping in the running kernel.
Check to see if the module is loaded:
```
lsmod | grep nf_conntrack
```
View the parameters available for the nf_conntrack module:
```
modinfo nf_conntrack
```
Verify the current setting of the timestamp parameter:
```
cat /sys/module/nf_conntrack/parameters/tstamp
```
Stop the firewall and unload the module:
```
systemctl stop firewalld
```
```
modprobe -r nf_conntrack
```
Load the module with timestamping enabled:
```
modprobe nf_conntrack tstamp=1
```
Verify the current setting of the timestamp parameter:
```
cat /sys/module/nf_conntrack/parameters/tstamp
```
Challenge

Make the change persist through a restart.
Make the change persist through a reboot:
```
echo "options nf_conntrack tstamp=1" > /etc/modprobe.d/nf_conntrack.conf
```

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