installing conntrackd

install | setup | routing states

tested on slack150 and debian12

installinstall

debian

the packages at hand

apt install conntrack conntrackd

ls -lF /etc/conntrackd/primary-backup.sh # no exist
ln -s /usr/share/doc/conntrackd/examples/sync/primary-backup.sh /etc/conntrackd/primary-backup.sh

you need to enable Netfilter connection tracker

apt install nftables

and a few handy tools won’t hurt

apt install netstat-nat tcpdump

slackware

slackpkg install nftables
slackpkg install libmnl
slackpkg install libnfnetlink
slackpkg install libnetfilter_conntrack
slackpkg install conntrack-tools
#+tcpdump
ln -s /usr/doc/conntrack-tools-1.4.6/sync/primary-backup.sh /etc/conntrackd/primary-backup.sh
sbopkg -i netstat-nat

from source

see conntrackd-source