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Installing oidentd is necessary if you're providing a public bouncer. Ident helps ensure that a user of your bouncer can always be uniquely identified, making it easier to ban that user and prevent abuse.
First, we install oidentd:
$ doas pkg_add oidentd
Afterwards, inside /etc/rc.local, we put the following:
if [ -x /usr/local/sbin/oidentd ]; then
echo -n ' oidentd'; /usr/local/sbin/oidentd -a :: -u _identd -g _identd
fi
This ensures that oident startrs at bootup and runs as the user and group _identd.