board Colibri iMUX6ULL with Linux 5.4.
when I ran this command in Linux:
iptables -A OUTPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
I got the following error message:
iptables v1.8.3 (legacy): Couldn't find match state
After search the internet, I was suggested to run the following command:
iptables -A OUTPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
But I got the following error:
iptables v1.8.3 (legacy): Couldn't find match
conntrack’`
The initial command was working properly in the earlier Linux version (4.4).
Would you please let me know what might get wrong. Thank you very much.