Mwan3 how to flush firewall conntrack table?

The mwan3 guide states:
As a test, you can quickly flush conntrack outside of mwan3 with conntrack -F

I am running 21.02.3 and when I try to execute conntrack -F, the system reports conntrack not found.

How do I flush the firewall conntrack table?

Found it - needed to install the conntrack opkg

Actually not, the following will yield the same effect without requiring an additional package:

echo f > /proc/net/nf_conntrack

This is an OpenWrt specific kernel modification.

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Thanks much!