Hello,
I have a question on iptables. On the arch wiki, the tutorial on a simple
stateful firewall includes the creation of the following rule.
# iptables -A INPUT -p tcp --syn -m state --state NEW -j OPEN-TCP
Which, to my understanding, meant only pass new TCP streams with the syn flag
(the initialize connection or handshake part 1 of 3) to the user defined chain.
When I checked the output of iptables, I noticed the following rule.
# iptables -L INPUT --line-numbers -v
7 OPEN-TCP tcp -- anywhere anywhere tcp
flags:FIN,SYN,RST,ACK/SYN state NEW
Why is iptables also using the FIN, RST and ACK/SYN flags? Did I not request
SYN only like I thought the tutorial said?
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