Help! by AlonsoMH23 from LinuxQuestions.org on 2020-07-16 02:47 (#55S77) Can somebody please explain me this lines# iptables -A INPUT -p tcp --dport 514 -s 192.168.90.1 -j ACCEPT# iptables -A INPUT -p tcp --dport 514 -j DROPlike what the -A, -p, -s, -j means please and thank you!