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Can any one help me by explaining about few of my queries.?
in below examples. I have taken these lines from my file /etc/sysconfig/iptables (I have gone lot of tutorials about iptables but I could not get answer of these following.
-A INPUT -j RH-Firewall-1-INPUT (what this line intending to saying?)
-A INPUT -p tcp -m tcp --dport 80 -j ACCEPT
(what is mean by -m ?)
-A RH-Firewall-1-INPUT -p icmp -m icmp --icmp-type any -j ACCEPT
(what is mean by --icmp-type?)
-A RH-Firewall-1-INPUT -p esp -j ACCEPT
-A RH-Firewall-1-INPUT -p ah -j ACCEPT
(what is man by -p esp, and -p ah ? and what is the propose of these two lines?)
-A RH-Firewall-1-INPUT -d 126.96.36.199 -p udp -m udp --dport 5353 -j ACCEPT
(Why this specific ip -d 188.8.131.52 is in my iptable file? what it is indicating it?)
-A RH-Firewall-1-INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
(what is the explanation of this line?)
-A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 21 -j ACCEPT
(in above line what is mean by
-- state NEW
-A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited
(what is the explanation of this above line?)