Open port with iptables

Linux and Unix-Like Red Hat
1

Hi,

What iptables command do I need to run in order to open up the following port for incomming traffic on the following server:

# telnet 127.0.0.1 1521
Trying 127.0.0.1...
telnet: connect to address 127.0.0.1: Connection refused
telnet: Unable to connect to remote host: Connection refused

R,
D.

2

Add the following line in /etc/sysconfig/iptables before the FORWARD chain:

-A INPUT -m state --state NEW -m tcp -p tcp --dport 1521 -j ACCEPT

And restart the iptables service:

service iptables restart

Check if the port is open now:

iptables -L
3

Kindly run the following command sequences on root terminal.

iptables -I INPUT -m state --state NEW -p tcp --dport 1521 -j ACCEPT
iptables -I INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
/etc/init.d/iptables save

4

iptables -A INPUT -p tcp -m tcp --dport 1521 -j ACCEPT
iptables save
service iptables restart