How to enable an incoming port in Linux Firewall?
Linux firewall rules can be altered to block/allow incoming/outgoing connections to any linux machine. For eg. In order to all incoming connection to port 26204 below rule can be added to the linux firewall:
iptables -A INPUT -i eth0 -p tcp –dport 26204 -j ACCEPT
- iptables -A INPUT: Append the new rule to the INPUT chain. For incoming connection request, this always has to be INPUT.
- -i eth0: This refers to the input interface. For incoming connections, this always has to be ‘-i’.
- -p tcp: Indicates that this is for TCP protocol.
- –dport 26204: This refers to the destination port for the incoming connection.
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