Linux Firewall Open specific ports (iptables)

View Status:
Iptables-l-N
Add the following methods for opening a specific port:
Use Iptables to open the following ports
/sbin/iptables-i input-p TCP--dport 8000-j ACCEPT
Save
/etc/rc.d/init.d/iptables Save
Restart Service
Service Iptables Restart
See if the port you want to open takes effect?
/etc/init.d/iptables status

Act 2:
or edit /etc/sysconfig/iptables directly
-A input-p tcp-m tcp--dport 4000-j ACCEPT
Save in the previous section
Reboot again:
Service Iptables Restart

Linux Firewall Open specific ports (iptables)