Solution 1:
--dport is part of the tcp match, which is -m or --match.
This would work:
iptables -A control_in -p tcp -m tcp --dport 22 -j ACCEPT
iptables: unknown option "--dport"
Solution 1:
--dport is part of the tcp match, which is -m or --match.
This would work:
iptables -A control_in -p tcp -m tcp --dport 22 -j ACCEPT